Security Notice: Critical Arbitrary File Delete Vulnerability in SonicWall SMA 100 Series Appliances
First Published:08/19/2021
Last Updated:09/24/2021
A critical vulnerability (CVSS 9.1) in SMA 100 series appliances, which includes SMA 200, 210, 400, 410 and 500v, could potentially allow a remote unauthenticated attacker the ability to delete arbitrary files from a SMA 100 series appliance and potentially gain administrator access to the device.
The vulnerability (SNWLID-2021-0021) is due to an improper limitation of a file path to a restricted directory potentially leading to arbitrary file deletion as ‘nobody.’
There is no evidence that this vulnerability is being exploited in the wild.
SonicWall strongly urges that organizations follow the guidance below to patch SMA 100 series products, which include SMA 200, 210, 400, 410 and 500v.
IMPACT
As outlined in SNWLID-2021-0021, successfully leveraging CVE-2021-20034 against impacted SMA 100 devices can result in a remote attacker obtaining administrator access on the underlying host. The below SMA 100 series appliances are impacted by this vulnerability.
Impacted Platforms | Impacted Versions |
SMA 100 Series |
|
TEMPORARY MITIGATIONS
There are no temporary mitigations. SonicWall urges impacted customers to implement applicable patches as soon as possible.
RESOLUTION
Organizations using SMA 100 series appliances should immediately log in to MySonicWall.com to upgrade their appliances to the patched firmware versions outlined below. For upgrade assistance, please reference the KB article, “How to Upgrade Firmware on SMA 100 Series Appliances” or contact SonicWall support.
Product | Platform | Impacted Version | Fixed Version | |
SMA 100 Series |
|
10.2.1.0-17sv |
10.2.1.1-19sv | |
10.2.0.7-34sv |
10.2.0.8-37sv | |||
9.0.0.10-28sv |
9.0.0.11-31sv | |||
NOTE: The above SMA 100 series firmware updates also address non-critical vulnerabilities outlined in SNWLID-2021-0020 and SNWLID-2021-0022.
IMPORTANT: Adhering to industry best practices, SonicWall does not provide support (e.g., technical support, firmware updates/upgrades, hardware replacements) for products that have reached End-of-Support (EOS) status, including Secure Remote Access (SRA) series devices. View the SonicWall Product Lifecycle Table for more information.
ADDITIONAL RESOURCES
TIP: See the Japanese translation for this alert here.
