Asterisk: IAX2 video frame buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200606-15 / asterisk
Release Date	June 14, 2006
Latest Revision	June 14, 2006: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/asterisk	< 1.0.11_p1	>= 1.0.11_p1	All supported architectures

Related bugreports: #135680

Synopsis

Asterisk contains a bug in the IAX2 channel driver making it vulnerable to the remote execution of arbitrary code.

2. Impact Information

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.

3. Resolution Information

Workaround

Disable public IAX2 support.

Resolution

All Asterisk users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4. References

Page updated June 14, 2006

Summary: This is a Gentoo Linux Security Advisory

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