Attack Chain

1. An attacker sends a crafted HTTP request to the test.php endpoint.
2. The request includes a malicious URL, designed to exploit the insufficient input validation in the file_get_contents or curl code paths. For example, using httpevil[.]com to bypass the regex check /^http/.
3. The test.php script processes the request, attempting to retrieve content from the attacker-controlled URL using either file_get_contents or curl.
4. Due to the lack of proper sanitization, the malicious URL is interpreted as an OS command.
5. The server executes the attacker-supplied OS command.
6. The attacker gains arbitrary code execution on the AVideo server.
7. The attacker can then perform various malicious activities, such as installing malware, stealing sensitive data, or pivoting to other systems on the network.

Impact

Successful exploitation of this vulnerability (CVE-2026-41064) grants unauthenticated attackers the ability to execute arbitrary code on the affected AVideo server. This can lead to complete compromise of the server, including data theft, defacement, or use as a staging ground for further attacks. Given the platform’s use in video hosting, successful attacks could impact numerous users and content creators relying on the vulnerable AVideo instance. The vulnerable regex /^http/ and unsanitized functions leave the server open to mass exploitation if exposed to the public internet.

Recommendation

• Apply the updated fix detailed in commit 78bccae74634ead68aa6528d631c9ec4fd7aa536 to fully address the input validation issue in test.php.
• Deploy the Sigma rule “Detect AVideo test.php Command Injection Attempt” to detect exploitation attempts in web server logs.
• Monitor web server logs for requests to test.php containing suspicious URLs, especially those matching the httpevil[.]com pattern as documented in the IOCs.
• Implement a more robust URL validation mechanism that properly sanitizes input before passing it to file_get_contents or curl.