IT NEWS

Slack, the workplace communication platform, has notified some of its users that their hashed passwords have been subject to exposure for the last five years. The company wasn’t specific in its notice, but Wired said that the flaw was in one of its “low-friction features”. The flaw exposed hashed passwords of users when creating or revoking shared invitation links for workspaces.

“When a user performed either of these actions, Slack transmitted a hashed version of their password to other workspace members,” the company said in a notice. “It affected all users who created or revoked shared invitation links between 17 April 2017 and 17 July 2022.”

Putting a plaintext password through a hashing algorithm changes it to a cryptographically scrambled or obfuscated version of itself, now called a “ciphertext”. It is a unique string of characters with a fixed length. Adding “salt”—essentially random data—when hashing would further protect the password from getting easily extracted by threat actors.

The exposure only occurs behind the scenes, though, as Slack users who were sent these invitations couldn’t see the passwords. However, they weren’t completely inaccessible, although seeing the exposed passwords required actively monitoring encrypted traffic from Slack’s servers.

“We have no reason to believe that anyone was able to obtain plaintext passwords because of this issue. However, for the sake of caution, we have reset affected users’ Slack passwords.”

Slack warned that hashes are “secure, but not perfect.” Hashed passwords could still be revered by brute force methods.

Slack promptly patched the flaw after an independent security researcher reported it to Slack last month. It then notified the approximately 0.5 percent of all its users who may have been affected, 

The company also took this opportunity to advise its users to enable 2FA (two-factor authentication) on their accounts and create strong and unique passwords. It also advised users to check access logs, which they can find here, for their accounts.

Microsoft has published fixes for 141 separate vulnerabilities in its batch of August updates, fixing a total of 118 CVEs in multiple products. This is a new monthly record if you look at the CVE count.

Publicly disclosed computer security flaws are listed in the Common Vulnerabilities and Exposures (CVE) database. Its goal is to make it easier to share data across separate vulnerability capabilities (tools, databases, and services). These are the CVEs that jumped out at us.

Microsoft Support Diagnostics Tool

CVE-2022-34713: is a Microsoft Windows Support Diagnostic Tool (MSDT) Remote Code Execution (RCE) vulnerability. This is a known to be exploited vulnerability which requires the target to open a specially crafted file. This CVE is a variant of the vulnerability publicly known as Dogwalk.

CVE-2022-35743: is another MSDT RCE vulnerability. Neither technical details nor an exploit are publicly available, but we do know that user interaction is required and the attack vector is local, so this is very likely another case where a specially crafted file needs to be opened by the victim.

Microsoft Exchange

CVE-2022-30134: is a Microsoft Exchange Information Disclosure vulnerability. This vulnerability is publicly disclosed but has not yet been detected in attacks. Affected products are Microsoft Exchange Server 2019 CU 11, Microsoft Exchange Server 2016 CU 22, Microsoft Exchange Server 2013 CU 23, Microsoft Exchange Server 2016 CU 23, and Microsoft Exchange Server 2019 CU 12. Users vulnerable to this issue would need to enable Extended Protection in order to prevent exploitation of this vulnerability. More details can be found on the Exchange Team Blog.

CVE-2022-24477: is a Microsoft Exchange Server Elevation of Privilege (EoP) vulnerability. Affected products are Microsoft Exchange Server 2016 CU 23, Microsoft Exchange Server 2019 CU 12, Microsoft Exchange Server 2019 CU 11, Microsoft Exchange Server 2016 CU 22, and Microsoft Exchange Server 2013 CU 23. Users vulnerable to this issue would need to enable Extended Protection in order to prevent exploitation of this vulnerability. More details can be found on the Exchange Team Blog.

CVE-2022-24516: is another a Microsoft Exchange Server EoP vulnerability. Affected products are Microsoft Exchange Server 2016 CU 23, Microsoft Exchange Server 2019 CU 12, Microsoft Exchange Server 2013 CU 23, Microsoft Exchange Server 2019 CU 11, and Microsoft Exchange Server 2016 CU 22. Users vulnerable to this issue would need to enable Extended Protection in order to prevent exploitation of this vulnerability. More details can be found on the Exchange Team Blog.

Windows Point-to-Point Protocol

CVE-2022-30133: is a Windows Point-to-Point Protocol (PPP) RCE vulnerability with a CVSS score of 9.8 out of 10. An unauthenticated attacker could send a specially crafted connection request to a remote access server (RAS) server, which could lead to remote code execution (RCE) on the RAS server machine. This vulnerability can only be exploited by communicating via port 1723. As a temporary workaround prior to installing the updates that address this vulnerability, you can block traffic through that port thus rendering the vulnerability unexploitable.

Windows Network File System

CVE-2022-34715: is a Windows Network File System (NFS) RCE vulnerability with a CVSS score of 9.8 out of 10. This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE). This vulnerability is not exploitable in NFSV2.0 or NFSV3.0. Prior to updating your version of Windows that protects against this vulnerability, you can mitigate an attack by disabling NFSV4.1. This could adversely affect your ecosystem and should only be used as a temporary mitigation.

Other vendors

Other vendors have synchronized their periodic updates with Microsoft. Here are few major ones that you may find in your environment.

Adobe has also released security updates for many of its products, including Acrobat, Reader, Adobe Commerce, and Magento Open Source. More details on the Adobe security site.

Cisco released security updates for numerous products this month.

Google released Android security updates.

SAP released 5 new Security Notes.

VMware released Security Advisory VMSA-2022-0022 and warned that a recently disclosed auth bypass flaw is now actively exploited.

Twitter has confirmed that it was breached last month via a now-patched 0-day vulnerability in Twitter’s systems, allowing an attacker to link email addresses and phone numbers to user accounts. This enabled the attacker to compile a list of 5.4 million Twitter user account profiles.

“We want to let you know about a vulnerability that allowed someone to enter a phone number or email address into the log-in flow in the attempt to learn if that information was tied to an existing Twitter account, and if so, which specific account. We take our responsibility to protect your privacy very seriously, and it is unfortunate that this happened.”

When a person submits a publicly known email address or phone number to Twitter, the system tells this person what Twitter account the email or phone number is associated with. The attacker took advantage of this and created a list containing 5.4 million Twitter users with scraped publicly available details of the accounts, including whether the account was verified.

This is especially worrying for users who want to remain anonymous on the platform. It’s a bit late now, but Twitter recommends anyone trying to stay anonymous should not tie a publicly known phone number or email to their Twitter account.

If you operate a pseudonymous Twitter account, we understand the risks an incident like this can introduce and deeply regret that this happened. To keep your identity as veiled as possible, we recommend not adding a publicly known phone number or email address to your Twitter account.

According to BleepingComputer, the attacker sold the data on twice, saying that “the data would likely be released for free in the future.”

Twitter introduced the vulnerability after updating its code in June 2021. A threat hunter reported this vulnerability in January 2022, with Twitter eventually awarding the researcher for the find as part of its bug bounty program.

While the company says no passwords were compromised, it continues to encourage users to enable two-factor authentication (2FA) for their accounts, either in the form of authentication apps or hardware keys.

Most cybersecurity experts agree that having Endpoint Detection and Response software is essential to fighting ransomware today—but not every EDR is equal.

Businesses, especially small-to-medium sized ones with limited budget or IT resources, need to make sure that their EDR is cost-effective, easy-to-use, and able to reliably stop the growing ransomware threat. So precisely what features should SMBs be looking for in an anti-ransomware EDR, and why?

In this post, Robert Zamani, Regional Vice President, Americans Solutions Engineering at Malwarebytes, gives his 6-point checklist of features your EDR should have to stop ransomware.

Table of contents

How should EDR address ransomware?

At its core, ransomware is an exploitation of trust, Zamani says.

“We place our trust in applications to perform only the functions we intended, Operating Systems to perform functions we authorized, and that our credentials (user ID/password) are used only by authorized personnel. Stolen credentials, phishing attacks, zero-day applications, and OS vulnerabilities exploit our trust in endpoints. And since ransomware stems from exploitation of trust, then EDR is not optional when it comes to mitigating a detected threat.”

A risk management strategy states that we cannot eliminate all system vulnerabilities or block all cyberattacks. In other words, your EDR should be optimized to “prevent what you can and mitigate the rest.”

“Since ransomware stems from exploitation of trust, then EDR is not optional when it comes to mitigating a detected threat.”

Robert Zamani, Regional Vice President, Americans Solutions Engineering

1.   Multi-vector Endpoint Protection (EP) is built-in

The base functionality of any EDR is to notify you of any suspicious activity that is taking place on your systems and offer “response” capabilities to mitigate the detection. However, EDR doesn’t inherently do any prevention: It won’t stop the threat from breaching your environment in the first place. 

Relying solely on EDR as a prevention solution will overwhelm your staff and increase operational costs.

That is why anti-ransomware starts with preventing the known bad, Zamani says. Enter Endpoint Protection (EP), an advanced threat prevention solution for endpoints that uses a layered approach with multi-vector detection techniques.

Many EDR vendors will offer EP as a separate offering—usually, these are just file-based scanners looking for possible clues to malware in binary files. This is the minimal functionality of EP and insufficient because there is more that can be prevented, Zamani says.

EP must reduce the attack surface of ransomware through a combination of comprehensive web protection, application hardening, and other “first-layers of defense”. Since most ransomware attacks start with a phishing email, this primary ‘preventative’ type of endpoint protection is essential.

For a budget-friendly way to get the first layer of ransomware protection, look for an EDR with full-stack Endpoint Protection.

EP gives you a “first-layer of defense” against known and unknown malware, ransomware, and other threats.

2. Maintains visibility and patching regularly

Patching is not just system maintenance, Zamani says. According to the Ponemon Institute, 57% of cyberattack victims report that their breaches could have been prevented by installing an available patch. 

“Application and OS vulnerability assessment and patch management solutions are preventative and reduce the ransomware attack surface on endpoints. A good application and OS, vulnerability management solution must automate inventory and severity classification based on CVSS scoring,” Zamani says. “The sorting by severity and grouping by the asset (endpoint) will allow you to prioritize patching the most valuable endpoints.”

In short, make sure your EDR has some sort of vulnerability and patch management component to make it more difficult for ransomware attackers to breach your systems.

3. Has machine learning (ML) to recognize ‘goodware’ instead of malware

A good EDR is looking for a deviation from good behavior, Zamani says. When an application launches and performs in an expected way, we call that an example of good behavior—and when it doesn’t, the administrator gets an alert notifying them of suspicious activity warranting investigation.

Contrast this with an ML model trained to recognize “bad behavior,” where the model finds patterns in datasets of known malware code. On the low side, there are tens of billions of unique malware, so we can safely assume “bad behavior” is seemingly endless.

The larger the dataset of bad behavior, the greater the chances of misinterpreting good behavior as bad, leading to many false positives.

“Indicators of Compromise (IOC) and Indicators of Attack (IOA) are ill-suited for EDR detections. IOC and IOA define bad, and ‘bad’ mutates, creating 100s of billions of possibilities,” Zamani says. Therefore, a modern EDR heuristics engine must be trained on the good behavior of known-good applications.

Dealing with too many false positives costs time and manpower, distracting you from actual security issues like ransomware. Make sure you choose an EDR that detects deviations from known-good applications to reduce false positives that could distract you in your fight against ransomware.

4. Uses standard reference language and forensic analysis

So your EDR has EP and is looking for deviation from known-good behavior to lower false positives—now, it has sent you a notification of a ransomware threat. The next piece of an anti-ransomware EDR is that the information that comes to you should be standardized both in summary and in detail.

“Traditional, older style EDR will use vendor-specific verbiage for describing the attack,” Zamani says. “But in your EDR, you want the TTPs (tools, techniques, and procedures) of threats to be described in plain English with a common reference number.”

The reference number is necessary for documentation purposes, Zamani says. At the same time, the plain-English description is necessary for you to know at what stage an endpoint was ransomed (because a hacker could have exploited a vulnerability in a still-running application).

“In your EDR, you want the TTPs (tools, techniques, and procedures) of threats to be described in plain English with a common reference number.”

Robert Zamani, Regional Vice President, Americans Solutions Engineering

To avoid unnecessary complexity in figuring out the origin of a ransomware threat, your EDR solution should have an industry standardized way of describing the attack—such as MITRE ATT&CK (Adversarial Tactics, Techniques, and Common Knowledge).

“Your EDR needs to tell the story of what happened using the standard reference language of MITRE with direct links to the MITRE ATT&CK reference library,” Zamani says. “It should provide a summary using a Kanban board and a separate process graph with detailed forensics of what and how it happened.”

Your EDR should show you alerts that are standardized both in summary and in detail.

5. Thorough containment, eradication, and recovery options

Look to an EDR to mitigate unforeseen threats and ultimately a new method of ransomware (exploitation of trust), says Zamani.

If one of your endpoints gets infected with ransomware, we want to stop the spread as fast as possible, which NIST defines as “containment” in its “Computer Security Incident Handling Guide.”

Containment prevents lateral movement of an attack by allowing you to contain individual machines, processes, or user-IDs and continue active response activities—making quick and easy containment features a must for your EDR.

But the fight doesn’t stop at containment, says Zamani.

“So you’ve contained and studied a threat with your EDR. That’s great,” says Zamani. “But now you want to do remediation. You want to remotely eradicate the ransomware and restore the endpoint to a known-good state free of malware, virus, unwanted programs including unwanted modification.”

But you may ask: Aren’t eradicating and recovering from ransomware the same thing? Not quite, Zamani says.

“Just because you deleted the artifacts does not restore the endpoint into a state where the machine can function. For example, a registry key says the startup sequence is ‘malware first, and then boot.’ So we remove the nasty registry key ‘malware first’, but if you say nothing else, the system won’t boot!”

In other words, your EDR needs instrumentation that not only eradicates ransomware but actually recovers and restores the machine’s state into a functioning state where it can be returned to the network.

“Your ransomware rollback should store changes to data files on the system in a local cache for 72 hours (no ransomware actually exceeds 24 hours), which can be used to help revert changes caused by ransomware,” Zamani says.

6. Searches for ransomware indicators across all your managed endpoints

What if you want to see if the same ransomware threat you discovered on one of your endpoints is in the early stages of the attack on other endpoints?

“Your EDR should have a search engine that can look at any of the TTPs and search across your network,” Zamani says. “Because you want to see if you can catch something early enough before it hits the point of ransom.”

Look for an EDR that can search data like files, registry, processes, and networking activity so you can threat hunt or analyze how a ransomware compromise occurred in your environment.

Businesses need an EDR that immediately detects and responds to ransomware threats

In this post, cybersecurity expert Robert Zamani explained the features SMBs should look for in an anti-ransomware EDR and why.

Of course, the fight against ransomware doesn’t stop at EDR: you still good cyber hygiene with a well-written and practiced Incident Response Plan (IRP). Looking to further empower your business in the fight against ransomware?

Read our “A Defender’s Guide to Ransomware Resilience” eBook!

More resources

Ransomware protection with Malwarebytes EDR: Your FAQs, answered!

Simplifying the fight against ransomware: An expert explains

Demo: Your data has been encrypted! Stopping ransomware attacks with Malwarebytes EDR

Cloud-based communication platform provider Twilio has announced a breach via a social engineering attack on employees.

On August 4, 2022, Twilio says it became aware of unauthorized access to information related to a limited number of Twilio customer accounts, through the social engineering attack which was designed to steal employee credentials.

Text messages

A number of current and former employees received text messages that appeared to come from Twilio’s IT department. The messages said either the recipient’s password had expired, or that their schedule had changed, and that they needed to log in. To increase the credibility of the URLs they contained words including “Twilio,” “Okta,” and “SSO” (short for single sign-on) to try and trick users to click on a link which led to a fake log in site. At this site, the attacker could intercept the login credentals and use those to access the compromised accounts.

The attackers must have put in some effort to link the Twilio employees to their phone numbers. It seems likely they used data from another breach, or breaches, and searched for Twilio employee names with their phone numbers. It would be easy to assume that it might have been one of the LinkedIn data breaches from 2021, because employer data would be needed, but unfortunately there are many other options to combine data from other breaches.

It certainly does add a layer of credibility to the attack, since most people don’t give their telephone number to just anyone, but their employer would know it.

Take down

Once Twilio confirmed the incident, its security team revoked access to the compromised employee accounts to mitigate the attack and a forensics firm was engaged to aid the ongoing investigation.

The text messages originated from US carrier networks, and Twilio says it worked with these carriers to shut down the numbers, and worked with the hosting providers serving the malicious URLs to shut those accounts down. It’s possible, however, that the attackers will continue to rotate through carriers and hosting providers to resume their attacks.

Twilio customers

Twilio has notified the affected customers. If you were not contacted by Twilio, then it means there is no evidence that your account was impacted by this attack.

Protection

By providing employees with mobile devices or allowing them to use personal smartphones for work, organizations have increased the possible number of targets for phishing campaigns.

Since employees’ phones are usually outside of the scope of an organizations security software, protection against this sort of attack is not easy.

The massive use of smartphones, tablets and mobile applications in our daily lives, for personal and professional purposes, turns them into essential tools that we trust maybe a tad too much.

And it’s not just text messages you need to worry about. Social media, messaging apps, and even dating apps have created many other channels to deliver an attack.

Providing your employees with software that blocks malicious text messages and URLs will only be effective against long-running campaigns, so it’s likely that this one would have made it through.

The most effective strategy is education. Users need to learn that text messages are to be treated with the same amount of suspicion as unexpected emails. Especially if the text message contains a link.

Stay safe, everyone!

The new school season is just around the corner. And while you are getting ready to go back to school, now is a good opportunity to check you are doing all you can to stay as safe as possible online.

Make sure you are doing these five things:

1. Use multi-factor authentication (MFA)

MFA has become a necessary security measure in a world where passwords still rule. It’s added security for your school-related accounts—and actually any online accounts you have, including social media.

MFA is an additional layer of security, after you enter your username and password. This could be a code generated by an app, a push notification you need to accept, a physical key you plug into your computer, or similar.

Use it wherever it is offered to you. Yes, it makes logging in take slightly longer, but it really does make your accounts safer.

2. Use strong passwords

By “strong”, we mean the best possible password string you can come up. If, for example, your school IT administrator sets a maximum password length of 10 and allows a mix of alphabets and numbers, then make your password 10 characters long with the maximum complexity you can.

And while we’re on the subject of passwords, remember to use a unique password for each of your online accounts. If you use the same email and password combination for every account, then if one gets breached you have to assume they have all been breached.

Of course, it’s impossible to remember a strong password for every account you have. This is where password managers come in. They can generate passwords for you, and will remember them all too. Just make sure you use a super strong password for your password manager itself, and protect it with MFA.

Lastly, never share passwords with anyone.

3. Be wary of links and attachments

When it comes to phishing and malware campaigns, danger doesn’t just lurk in emails. It’s on social media, SMS, chat platforms, gaming platforms, and other online watering holes, too.

Remember: if someone sends you an unsolicited link or attachment, you’re right to be suspicious. Treat it as suspect, and always verify with the sender if they’re someone you know, preferably via other means than the medium with which you received the link or attachment.

4. Share with caution

Students can do this in (at least) three ways:

1. Limit what you share. Don’t give away personal details on social media, including those which tie you to your school.
2. Be smart about what information you allow apps to access. Does that calendar app really need access to your location?
3. For high school and college students, think twice before sharing private photos with someone. Consider that they may be shared with others, and how you might feel if that happened.

5. Lock down your files

The school does its part to secure your most important data, but you have a part to play, too.

You can start by locking down the devices you bring to school, such as your smartphone and laptop. Make sure there’s at least a password or code that stops anyone from casually picking up your device, and then opening it.

If you use the cloud to store files, learn how to secure that properly—the cloud-of-your-choice will have a guide on that. Remember, the cloud can only be as secure as you, the user, makes it.

It’s easy when you know how

Thankfully, securing data doesn’t get any more complicated for regular users than the five tips we have listed above. Remain vigilant and remind yourself that cybersecurity and privacy are shared goals and responsibilities. Students should do their part in the same way that your school’s IT team is doing theirs.

Stay safe, and have a pleasant, risk-free school year ahead!

Last week on Malwarebytes Labs:

• Have we lost the fight for data privacy? Lock and Code S03E16

• Wrestling star Mick Foley’s Twitter compromised, selling PS5 consoles

• Millions of Arris routers are vulnerable to path traversal attacks

• When a sextortion victim fights back

• How to protect yourself and your kids against device theft

• For months, JusTalk messages were accessible to everyone on the Internet

• Update now! VMWare patches critical vulnerabilities in several products

• NetStandard attack should make Managed Service Providers sit up and take notice

• Bank fraud scammers trick victims with claims of bogus Zelle transfers

• Woody RAT: A new feature-rich malware spotted in the wild

• Ransomware protection with Malwarebytes EDR: Your FAQs, answered!

• Ransomware review: July 2022

• FCC warns of steep rise in phishing over SMS

• Phishy calls and emails play on energy cost increase fears

• Patch now! Cisco VPN routers are vulnerable to remote control

Stay safe!

Thanks to Pieter Arntz and the Threat Intelligence Team who contributed to the research.

A hack tool is a program that allows users to activate software even without a legitimate, purchased key. Hack tools are often used to root devices in order to (among others) remove barriers that stop users from using apps from other markets. This is why the term “hack tool” is often interchanged with “crack tool” and “rooting program.”

Many seek such tools in the hopes of getting more control over their devices, or out of necessity if the software they want to use requires them. In this post, we’ll focus on one hack tool that has been a trusted tool for activating pirated copies of Microsoft products for free: KMSPico.

What is KMSPico?

KMSPico (often stylized as KMSPICO or KMS Pico) uses an unofficial key management services (KMS) server to activate Microsoft products—although several hack tools already do the same. Here are some of Malwarebytes’ detection of such tools:

• RiskWare.AutoKMS
• AutoKMS.HackTool.Patcher.DDS
• RiskWare.KMS
• HackTool.KMS
• HackTool.Agent.KMS
• HackTool.IdleKMS
• HackTool.AutoKMS
• HackTool.WinActivator

KMSPico is one of the most (if not the most) popular software activation tools for Windows and Office Suite, with millions of global users and endorsers. Funnily enough, it also seems to have a lot of “official websites.”

Searching for “official KMSpico site” on your favorite search engine will yield thousands of results, including pages of posts from various portals warning internet users not to download KMSPico from Website A or Website B as its malware. And they’re right.

Whatever KMSPico “official” website you find in your search results is undoubtedly fake, which leaves people wondering—or probably even believing—that KMSPico is a myth. This tool, however, is far from mythical. It does exist, and the latest version, 10.2.0, can only be downloaded from a members-only forum posted almost a decade ago.

How does it work?

To understand how KMSPico works, we should first understand how a KMS activation works.

KMS is a legitimate way to activate Windows licenses in client computers, especially en masse (volume activation). There is even a Microsoft document on creating a KMS activation host.

A KMS client connects to a KMS server (the activation host), which contains the host key the client uses for activation. Once KMS clients are validated, the Microsoft product on those clients contacts the server every 180 days (6 months) to maintain its validity. However, a KMS set-up is only viable for large organizations with Volume Licensed (VL) Microsoft products.

This is what KMSPico is trying to exploit. Once installed onto user clients, it changes a user’s retail version of their Microsoft to a “Volume Licensed” one by simply changing the key into a generic VL key. KMSPico then changes the default KMS server to an unofficial KMS server set up by the hack tool’s developer. 

Note that if the KMSPico developer decides to kill the server, then whoever their users are would no longer have an activated version of their Microsoft product.

Why we don’t recommend it

Hack tools can be qualified as riskware, a category of software that may be risky to install on your computer or device. This is because a legitimate copy of the software may be bundled with adware, or it’s actually malware named after popular software. Such is the case for KMSPico.

On top of that, using KMSPico violates Microsoft’s ToS (terms of service) for its products.

Our 2021 State of Malware report found that hack tools plagued our consumer and enterprise clients for the previous two years. 

Perhaps the most critical data we have of KMS hack tools are that they are ranked as a top threat for consumers (with a 2,118 percent growth) and enterprises (with a 2,251 percent growth). We attributed this to the sudden change in work life due to many moving to a work-from-home (WFH) set up during the COVID-19 pandemic. Many employees—and potentially even employers—resorted to using cracked versions of Microsoft products.

Finally, regarding software updates or patching, it’s also likely that KMSPico blocks any activated Microsoft product from “calling home.” If it does, then that would stop these products from getting updates or patches, and KMSPico users would be left with very vulnerable Microsoft software.

Does Malwarebytes detect KMSPico?

Yes. We detect components from the same toolset. So if you have downloaded the KMSPico tool, expect your Malwarebytes product to alert you of files detected as HackTool.KMSpico, CrackTool.KMSPico, or both.

Cisco has released a security advisory about several vulnerabilities in the Cisco Small Business RV series routers, covering the RV160, RV260, RV340, and RV345.

There are no workarounds available that address these vulnerabilities, so you need to patch.

Vulnerabilities

The vulnerabilities are dependent on one another—exploitation of one of the vulnerabilities may be required to exploit another vulnerability.

Publicly disclosed computer security flaws are listed in the Common Vulnerabilities and Exposures (CVE) database. Its goal is to make it easier to share data across separate vulnerability capabilities (tools, databases, and services). You will find the ones included in these updates listed below.

CVE-2022-20842

CVE-2022-20842 is a vulnerability in the web-based management interface of the Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers. Exploitation of the vulnerability could allow an unauthenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition.

This vulnerability is due to insufficient validation of user-supplied input to the web-based management interface. An attacker could exploit this vulnerability by sending crafted HTTP input to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a DoS condition.

CVE-2022-20827

CVE-2022-20827 is a vulnerability in the web filter database update feature of Cisco Small Business RV160, RV260, RV340, and RV345 series routers. Exploitation of the vulnerability could allow an unauthenticated, remote attacker to perform a command injection and execute commands on the underlying operating system with root privileges.

This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by submitting crafted input to the web filter database update feature.

CVE-2022-20841

CVE-2022-20841 is a vulnerability in the Open Plug and Play (PnP) module of Cisco Small Business RV160, RV260, RV340, and RV345 series routers. Exploitation of the vulnerability could allow an unauthenticated, remote attacker to inject and execute arbitrary commands on the underlying operating system.

This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending malicious input to an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying Linux operating system. To exploit this vulnerability, an attacker must leverage a machine-in-the-middle position or have an established foothold on a specific network device connected to the affected router.

Input validation

After reading the vulnerability descriptions above you may wonder what “input validation” means, since the absence of it seems to be one of the underlying issues.

As you probably suspected, input validation is the name for the checks that are done on data being added to a system. It is necessary to ensure only properly formed data enters the workflow in an information system. When a system does not properly validate its inputs, it gives threat actors a chance to attempt several attacks, depending on the type of system.

The most common type is SQL injection, an attack used against databases. SQL commands are a mixture of actions (code) and things being acted upon (data). The external inputs that feed into SQL commands should only ever be interpreted as data. If they are interpreted as code then an attacker can inject input that changes the behaviour of an application’s SQL commands.

Insufficient input validation could allow an attacker to execute SQL commands that could destroy your database or provide the attacker with data stored in the database.

Mitigation

There are no workarounds that address these vulnerabilities but Cisco has released free software updates for them. Cisco states it is not aware of any public announcements or malicious use of the vulnerabilities. So, now is your chance to install those updates before that changes.

A list of releases in which these vulnerabilities have been fixed is available in the Cisco Security Advisory.

Stay safe, everyone!

The post Patch now! Cisco VPN routers are vulnerable to remote control appeared first on Malwarebytes Labs.

Gas and electricity price concerns are rife at the moment, with spiralling costs and bigger increases waiting down the line. Sadly this makes the subject valuable material for fraudsters, playing into people’s fears with a dash of social engineering to make them worse off than they were previously.

Warnings abound of several energy / cost of living-themed scams doing the rounds. Shall we take a look?

Identifiers of an attack

These attacks target individuals living in countries where oil or electricity prices are a concern. If you have an imminent set of price increases on the horizon, you may be a target. Phone calls, emails, whatever it takes to extract some cash. The UK is a particularly hot flashpoint for these fraud attempts at the moment.

The senders will typically claim to be from an organisation with authority. Maybe an energy watchdog, or a consumer rights group, or maybe an energy company.

Refunds, rebates, and discounts generally are the order of the day. There’s a number of schemes along these lines at the moment due to be rolled out, and you can expect fraudsters to ride on their coat tails.

Energy refund scam types

Fake rebates

This scam involves cold calling and a spin on the (genuine) rebate plan put together by the British Government. Fraudsters inform potential victims that they need to hand over bank details in order to qualify. Normally we’d say “this is not true”. However: There are some cases where people do hand over payment information. Local councils in the UK have reached out to many people pre-emptively to arrange rebate payments. Where the scammers have an angle is that lots of other residents have not been contacted.

In those cases, the onus is on the individual to reach out and apply. They can choose to have the rebate applied to their next local council bill, or have the money paid directly into their bank account. To do this, they need to hand over payment details. The caveat is that the person applying does this themselves, on their local council website. Nobody should be cold-calling asking for payment information.

Ofgem impersonators

Fraudsters are claiming to represent Ofgem, Britain’s independent energy regulator. They claim to be able to help you get a better energy deal and then ask for your payment details. These attacks come via text and email, and have been around for at least a month or so. Some of these also tap into the rebate scam, claiming to offer a “secure application” which is really just a phishing website.

Fake energy company refunds

This is a fairly common scam, just like fake tax refunds during tax season. They are definitely more relevant during the current energy crisis though. In this case, we’re talking fake refunds and a double-threat attack technique. The victim is lured in with emails offering a refund. Once the information is taken by the phishing website, the scammer calls the victim claiming to be working on behalf of their bank. The scammer goes on to highlight several types of fraud to be wary of, all the while trying to extract around $1,200 during the call.

How to avoid these threats

• Any email or phone call asking for payment information is not going to be legitimate. You should also never be asked for login details for your online banking or other accounts from a cold-caller.
• If you receive an unexpected call about energy prices or rebates, Insist on calling “them” back on their official number, taken from an official website, directly. If the caller objects to this, that’s an immediate red flag. A genuine caller would have no possible reason to object to this.
• Bogus fake energy company websites are very popular and easy to set up. Visit the official website listed in official correspondence only, and pay close attention to URLs sent to you by text or email.

Stay safe out there!

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