Debian Security Advisory

DSA-2276-1 asterisk -- multiple denial of service

Date Reported:

10 Jul 2011

Affected Packages:

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 631445, Bug 631446, Bug 631448.
In Mitre's CVE dictionary: CVE-2011-2529, CVE-2011-2535.

More information:

Paul Belanger reported a vulnerability in Asterisk identified as AST-2011-008 (CVE-2011-2529) through which an unauthenticated attacker may crash an Asterisk server remotely. A package containing a NULL char causes the SIP header parser to alter unrelated memory structures.

Jared Mauch reported a vulnerability in Asterisk identified as AST-2011-009 through which an unauthenticated attacker may crash an Asterisk server remotely. If a user sends a package with a Contact header with a missing left angle bracket (<) the server will crash. A possible workaround is to disable chan_sip.

The vulnerability identified as AST-2011-010 (CVE-2011-2535) reported about an input validation error in the IAX2 channel driver. An unauthenticated attacker may crash an Asterisk server remotely by sending a crafted option control frame.

For the oldstable distribution (lenny), this problem has been fixed in version 1.4.21.2~dfsg-3+lenny5.

For the stable distribution (squeeze), this problem has been fixed in version 1.6.2.9-2+squeeze3.

For the testing distribution (wheezy), this problem has been fixed in version 1:1.8.4.3-1.

For the unstable distribution (sid), this problem has been fixed in version 1:1.8.4.3-1.

We recommend that you upgrade your asterisk packages.