Advisory Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Arista NG Firewall. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of the custom_handler 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 www-data user.

07/03/24 – ZDI reported the vulnerability to the vendor
08/07/24 – the vendor acknowledged the receipt of the report
11/18/24 - ZDI asked for updates
11/21/24 - ZDI asked for updates
12/10/24 - ZDI notified the vendor of the intention to publish the cases as a  0-day advisory

Mitigation: Given the nature of the vulnerability, the only salient mitigation strategy is to restrict interaction with the application

• 2024-07-03 - Vulnerability reported to vendor
• 2024-12-19 - Coordinated public release of advisory
• 2024-12-19 - Advisory Updated