Sophos SFOS up to 17.0.3 MR2 Logging Subsystem User-Agent Persistent cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in Sophos SFOS up to 17.0.3 MR2. Affected is an unknown function of the component Logging Subsystem. Executing a manipulation of the argument User-Agent as part of HTTP POST Request can lead to cross site scripting (Persistent). The identification of this vulnerability is CVE-2017-18014. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Sophos SFOS up to 17.0.3 MR2. It has been declared as problematic. This vulnerability affects an unknown part of the component Logging Subsystem. The manipulation of the argument User-Agent as part of a HTTP POST Request leads to a cross site scripting vulnerability (Persistent). The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

An NC-25986 issue was discovered in the Logging subsystem of Sophos XG Firewall with SFOS before 17.0.3 MR3. An unauthenticated user can trigger a persistent XSS vulnerability found in the WAF log page (Control Center -> Log Viewer -> in the filter option "Web Server Protection") in the webadmin interface, and execute any action available to the webadmin of the firewall (e.g., creating a new user, enabling SSH, or adding an SSH authorized key). The WAF log page will execute the "User-Agent" parameter in the HTTP POST request.

The bug was discovered 01/08/2018. The weakness was shared 01/12/2018 as not defined mailinglist post (Full-Disclosure). The advisory is available at seclists.org. This vulnerability was named CVE-2017-18014 since 01/01/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k.

Applying the patch 17.0.3 MR3 is able to eliminate this problem.

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Productinfo

Vendor

• Sophos

Name

• SFOS

Version

• 17.0.3 MR2

License

• commercial

Website

• Vendor: https://www.sophos.com/

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