Asterisk ConfBridge 'dialplan' Privilege Escalation (AST-2014-017)
High Nessus Plugin ID 79441
SynopsisA telephony application running on the remote host is affected by a privilege escalation vulnerability.
DescriptionAccording to the version in its SIP banner, the version of Asterisk running on the remote host is potentially affected by a privilege escalation vulnerability in the ConfBridge 'dialplan' function that is triggered when executed from an external protocol. This could allow a remote, authenticated attacker to escalate privileges. Additionally, the 'ConfbridgeStartRecord' AMI action could be leveraged to execute arbitrary system commands.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
SolutionUpgrade to Asterisk 11.14.1 / 12.7.1 / 13.0.1 / 11.6-cert8 or apply the appropriate patch listed in the Asterisk advisory.