CVE-2020-5945

K21540525: F5 TMUI XSS vulnerability CVE-2020-5945

Original Publication Date: Nov 03, 2020

Security Advisory Description

Undisclosed TMUI page contains a stored cross site scripting vulnerability (XSS). The issue allows a minor privilege escalation for resource admin to escalate to full admin. (CVE-2020-5945)

Impact

A malicious, authenticated user with Resource Administrator privileges may be able to exploit this vulnerability to escalate their role to full Administrator privileges and execute system commands. This vulnerability is located in an undisclosed Configuration utility (TMUI) page.

Security Advisory Status

F5 Product Development has assigned ID 891457 (BIG-IP) to this vulnerability.

To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases, point releases, or hotfixes that address the vulnerability, refer to F5’s security advisory below. For more information about security advisory versioning, refer to K51812227: Understanding security advisory versioning.

Affected and fixed versions: F5 maintains the authoritative version matrix for this advisory, and it changes over time. For the current list of affected and fixed versions, see F5’s security advisory K21540525.

Security Advisory Recommended Actions

If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in the Fixes introduced in column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists.

Mitigation

To mitigate this vulnerability, you can disable TCP Segmentation Offload (TSO). You can do so by setting the value of the tm.tcpsegmentationoffload BigDB key to disable and restarting TMM. To do so, perform the following procedure:K13309: Restricting access to the Configuration utility by source IP address (11.x – 16.x) and
K13092: Overview of securing access to the BIG-IP system.
Acknowledgements

F5 would like to acknowledge Krzysztof Przybylski Consulting for bringing this issue to our attention, and for following the highest standards of coordinated disclosure.

Note

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