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GHSA-9j26-99jh-v26q
No affected components available
Impact
An unauthenticated attacker can execute arbitrary OS commands on the server by injecting shell command substitution into the base64Url GET parameter. This can lead to full server compromise, data exfiltration (e.g., configuration secrets, internal keys, credentials), and service disruption.
Root Cause
The base64Url parameter is Base64-decoded and then interpolated directly into a double-quoted ffmpeg shell command without proper shell escaping. The upstream validation uses FILTER_VALIDATE_URL, which validates URL syntax but does not prevent shell metacharacters / command substitution sequences from being interpreted by the shell.
Affected Components
objects/getImage.phpobjects/security.php- Execution path via async command execution helper (
shell_exec/nohup)
Patches
Apply strict shell argument escaping (e.g., escapeshellarg()) to all user-supplied values before building any shell command, and avoid double-quoted interpolation of untrusted input. Prefer safer process execution patterns where possible.
Workarounds
- Restrict access to
objects/getImage.phpat the web server / reverse proxy layer (IP allowlist, auth, or disable endpoint if not needed). - Apply WAF rules to block suspicious patterns and limit exposure until a patch is deployed.
Resources
- Report: "Unauthenticated OS Command Injection in AVideo-Encoder"
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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