Facebook Google Plus Twitter LinkedIn YouTube RSS Menu Search Resource - BlogResource - WebinarResource - ReportResource - Eventicons_066 icons_067icons_068icons_069icons_070

Tenable Blog

Subscribe

SonicWall Urges Users to Patch Several Vulnerabilities in Secure Mobile Access Products (CVE-2021-20038)

SonicWall patched eight vulnerabilities in its Secure Mobile Access 100 product line. None have been exploited in the wild, yet, but users are strongly urged to patch.

Background

On December 7, SonicWall issued an advisory (SNWLID-2021-0026) for eight CVEs in its Secure Mobile Access (SMA) 100 product line of remote access gateways. As part of the advisory, SonicWall “strongly urges” its customers to patch these vulnerabilities in the SMA 200, 210, 400, 410 and 500v products, in addition to SMA 100 series appliances with the Web Application Firewall (WAF) enabled.

CVEDescriptionCVSSv3
CVE-2021-20038Unauthenticated stack-based buffer overflow9.8
CVE-2021-20039Authenticated command injection7.2
CVE-2021-20040Unauthenticated file upload path traversal6.5
CVE-2021-20041Unauthenticated CPU exhaustion7.5
CVE-2021-20042Unauthenticated confused deputy6.3
CVE-2021-20043Heap-based buffer overflow8.8
CVE-2021-20044Post-authentication remote code execution7.2
CVE-2021-20045Multiple unauthenticated heap- and stack-based buffer overflows9.4

While there is no evidence at this time that these vulnerabilities have been exploited in the wild, SonicWall SMA devices have been targeted by threat actors in the past. In January, “highly sophisticated threat actors” exploited CVE-2021-20016, a critical SQL injection vulnerability in SMA100 devices. In July, SonicWall warned of an imminent ransomware attack leveraging known, patched vulnerabilities in SMA 100 products. The Cybersecurity and Infrastructure Security Agency also issued an alert about this campaign, confirming active attacks. It was later reported that the known flaw exploited in the campaign was CVE-2019-7481.

Analysis

The most severe of these flaws are a set of unauthenticated heap- and stack-based buffer overflow vulnerabilities. CVE-2021-20038 covers a single vulnerability and received a CVSSv3 score of 9.8, while CVE-2021-20045 covers multiple vulnerabilities, the bundle received at CVSSv3 score of 9.4. CVE-2021-20038 is the result of using strcat() function when handling environment variables from the HTTP GET method used in the SMA SSLVPN Apache httpd server. CVE-2021-20043 is also a heap-based buffer overflow and it received a CVSSv3 score of 8.8, but it requires authentication to exploit. For all three of these CVEs, successful exploitation would result in code execution as the “nobody” user in the SMA100 appliance.

The remaining flaws include a mix of authenticated and unauthenticated vulnerabilities ranging in severity from CVSSv3 6.3 to 7.5. Devices with the web application firewall enabled are still vulnerable to these flaws. Discovery of these vulnerabilities is credited to Jacob Baines of Rapid7 and Richard Warren of NCCGroup.

Proof of concept

At the time of publication, no proofs-of-concept have been published for any of these vulnerabilities.

Solution

SonicWall strongly urges users to update these devices. The advisory includes a guide for the impacted and fixed firmware versions.

Impacted ProductsImpacted VersionsFixed Versions
SMA 100 Series: SMA 200, 210, 400, 410, 500v9.0.0.11-31sv* and earlier, 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier10.2.0.9-41sv, 10.2.1.3-27sv

Identifying affected systems

A list of Tenable plugins to identify these vulnerabilities will appear here as they’re released.

Get more information

Join Tenable's Security Response Team on the Tenable Community.

Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.

Get a free 30-day trial of Tenable.io Vulnerability Management.

Related Articles

Are You Vulnerable to the Latest Exploits?

Enter your email to receive the latest cyber exposure alerts in your inbox.

Try Tenable.io

FREE FOR 30 DAYS

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Sign up now.

Buy Tenable.io

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

65 assets

Choose Your Subscription Option:

Buy Now

Try Nessus Professional Free

FREE FOR 7 DAYS

Nessus® is the most comprehensive vulnerability scanner on the market today. Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy Nessus Professional

Nessus® is the most comprehensive vulnerability scanner on the market today. Nessus Professional will help automate the vulnerability scanning process, save time in your compliance cycles and allow you to engage your IT team.

Buy a multi-year license and save. Add Advanced Support for access to phone, community and chat support 24 hours a day, 365 days a year.

Select Your License

Buy a multi-year license and save.

Add Support and Training

Try Tenable.io Web Application Scanning

FREE FOR 30 DAYS

Enjoy full access to our latest web application scanning offering designed for modern applications as part of the Tenable.io platform. Safely scan your entire online portfolio for vulnerabilities with a high degree of accuracy without heavy manual effort or disruption to critical web applications. Sign up now.

Buy Tenable.io Web Application Scanning

Enjoy full access to a modern, cloud-based vulnerability management platform that enables you to see and track all of your assets with unmatched accuracy. Purchase your annual subscription today.

5 FQDNs

$3,578

Buy Now

Try Tenable.io Container Security

FREE FOR 30 DAYS

Enjoy full access to the only container security offering integrated into a vulnerability management platform. Monitor container images for vulnerabilities, malware and policy violations. Integrate with continuous integration and continuous deployment (CI/CD) systems to support DevOps practices, strengthen security and support enterprise policy compliance.

Buy Tenable.io Container Security

Tenable.io Container Security seamlessly and securely enables DevOps processes by providing visibility into the security of container images – including vulnerabilities, malware and policy violations – through integration with the build process.

Get a Demo of Tenable.sc

Please fill out the form below with your contact information and a sales representative will contact you shortly to schedule a demo. You may also include a short comment (limited to 255 characters). Please note that fields with asterisks (*) are mandatory.

Try Tenable Lumin

FREE FOR 30 DAYS

Visualize and explore your Cyber Exposure, track risk reduction over time and benchmark against your peers with Tenable Lumin.

Buy Tenable Lumin

Contact a Sales Representative to see how Lumin can help you gain insight across your entire organization and manage cyber risk.

Request a demo of Tenable.ot

Get the Operational Technology Security You Need.
Reduce the Risk You Don’t.

Tenable.ad

Continuously detect and respond to Active Directory attacks. No agents. No privileges. On-prem and in the cloud.