Web Server PAJAX pajax_call_dispatcher RCE

PAJAX is an AJAX framework which allows PHP objects to be made remotely callable. Versions 0.5.0 and 0.5.1 are vulnerable to PHP command injection leading to PHP remote code execution (RCE).

Exploitation

Stages

1. The attacker sends an HTTP POST with JSON containing injected command to pajax_call_dispatcher.php and achieves RCE.
2. The server replies with HTTP 200 or HTTP 500.

Prerequisites

The attacker can access and exploit vulnerabilities without authentication.

Alert Logic Coverage

Alert Logic® has evaluated its customer base for exposure to the exploit and has developed signatures for mitigating the threat depending on the security service in place.

The Network-Based Intrusion Detection System (IDS) has been updated with the new signatures for this exploit when detected via Alert Logic Threat Manager™. If this signature is detected, an incident is generated in the Alert Logic console.

Detection of this threat is provided via Alert Logic ActiveWatch for Web Security Manager service. Depending on your deployment of Web Security Manager, you will receive an incident (for out-of-band deployment) or the threat will be actively blocked and rejected (for the inline Web Security Manager Premier deployment) if an exploit attempt is observed.

Recommendations for Mitigation

To mitigate the vulnerability, upgrade to version 0.5.2.