Asterisk: SIP Denial of Service

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/asterisk	< 1.2.14-r1	>= 1.2.14-r1, revision >= 1.0.12-r1	All supported architectures

Related bugreports: #169616

Asterisk is vulnerable to Denial of Service in the SIP channel.

2. Impact Information

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

The MU Security Research Team discovered that Asterisk contains a NULL-pointer dereferencing error in the SIP channel when handling request messages.

A remote attacker could cause an Asterisk server listening for SIP messages to crash by sending a specially crafted SIP request message.

3. Resolution Information

There is no known workaround at this time.

All Asterisk users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose net-misc/asterisk

Note: Asterisk 1.0.x is no longer supported upstream so users should consider upgrading to Asterisk 1.2.x.

4. References

Updated March 16, 2007

Summary: This is a Gentoo Linux Security Advisory

Security Team
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