Attack Chain

1. An attacker crafts a malicious encrypted payload containing a command injection payload leveraging the $() bash command substitution.
2. The attacker uploads or injects this payload into the AVideo platform.
3. AVideo processes the malicious payload, passing it to the sanitizeFFmpegCommand() function.
4. The sanitizeFFmpegCommand() function fails to properly sanitize the $() bash command substitution syntax within the payload.
5. The unsanitized command is then executed within a double-quoted sh -c context in the execAsync() function.
6. The sh -c interpreter executes the injected command, resulting in arbitrary code execution on the standalone encoder server.
7. The attacker gains control of the server, potentially leading to data exfiltration, system compromise, or further lateral movement.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary commands on the AVideo standalone encoder server. This can lead to complete system compromise, including data exfiltration, modification, or deletion. Given the nature of AVideo as a video platform, attackers could also inject malicious content into videos served by the platform, potentially affecting a large number of users.

Recommendation

• Apply the patch from commit 25c8ab90269e3a01fb4cf205b40a373487f022e1 to remediate CVE-2026-33482.
• Deploy the Sigma rule "Detect AVideo Command Injection Attempt" to detect potential exploitation attempts in web server logs.
• Monitor web server logs for suspicious requests containing shell metacharacters, especially $(), targeting the plugin/API/standAlone/functions.php path.