WebServer JBoss Application Server ReadOnlyAccessFilter RCE

In the Jboss Application Server with Red Hat Enterprise Application Platform versions 5.x and 6.x, the doFilter method in the ReadOnlyAccessFilter of the HTTP Invoker does not restrict classes for which it performs deserialization. This allows attackers to execute arbitrary code via crafted serialized data. 

Exploitation

Stages

1. The attacker sends an HTTP POST request with a serialized Java object in bytecode to the vulnerable JBoss Application Server. The server deserializes the object and executes the attacker’s commands.
2. The server replies with HTTP 500 internal server error and string, indicating successful remote command execution.

Prerequisites

The attacker can access and exploit the application server directly and 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.

Recommendations for Mitigation

Upgrade to a non-vulnerable version to mitigate this vulnerability.