F5 BIG-IP OS unzip Directory Traversal Remote Code Execution Vulnerability

October 18th, 2023
ZDI-23-1559 ZDI-CAN-21463

CVE ID

CVE-2023-41373

CVSS Score

8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

F5

Affected Products

BIG-IP OS

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of F5 BIG-IP OS. Authentication is required to exploit this vulnerability.

The specific flaw exists within the unzip method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the apache user.

Additional Details

F5 has issued an update to correct this vulnerability. More details can be found at:
https://my.f5.com/manage/s/article/K000135689

Disclosure Timeline

  • 2023-07-20 - Vulnerability reported to vendor
  • 2023-10-18 - Coordinated public release of advisory

Credit

Alex Birnberg

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