Overview

A remote code execution vulnerability in the WebAdmin of SG UTM was recently discovered and responsibly disclosed to Sophos. It was reported via the Sophos bug bounty program by an external security researcher. The vulnerability has been fixed.

The remediation prevented users from remotely executing arbitrary code. There was no evidence that the vulnerability was exploited and to our knowledge no customers are impacted.

Applies to the following Sophos product(s) and version(s)

• Sophos SG UTM

Remediation

• Fix included in SG UTM v9.705 MR5, v9.607 MR7, and v9.511 MR11 on September 17, 2020
• Users of older versions of SG UTM are required to upgrade to receive this fix
• Additionally, Sophos recommends that SG UTM customers upgrade to the latest available release

Workaround

Customers can protect themselves by ensuring their WebAdmin is not exposed to WAN.

This can be achieved by keeping Internal (LAN) (Network) or another internal-only network definition as the sole entry in Management→WebAdmin Settings→WebAdmin Access Configuration→Allowed Networks.

Related information

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25223