Asterisk: IAX2 video frame buffer overflow

Background

Asterisk is an open source implementation of a telephone private branch exchange (PBX).

Description

Asterisk fails to properly check the length of truncated video frames in the IAX2 channel driver which results in a buffer overflow.

Impact

An attacker could exploit this vulnerability by sending a specially crafted IAX2 video stream resulting in the execution of arbitrary code with the permissions of the user running Asterisk.

Workaround

Disable public IAX2 support.

Resolution

All Asterisk users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/asterisk-1.0.11_p1"