Asterisk bug reported

[jmullinix]

I got this from Secunia today,

John


[SA34229] Asterisk "pedantic" SIP Processing Denial of Service
From: Secunia Security Advisories <[email protected]>

TITLE:
Asterisk "pedantic" SIP Processing Denial of Service

SECUNIA ADVISORY ID:
SA34229

VERIFY ADVISORY:
http://secunia.com/advisories/34229/

DESCRIPTION:
Some vulnerabilities have been reported in Asterisk, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerabilities are caused due to NULL-pointer dereference errors
in the "sip_uri_params_cmp()" and "sip_uri_headers_cmp()" functions.
This can be exploited to crash the application via a SIP message
lacking certain headers.

Successful exploitation requires that the SIP channel driver is
configured with the "pedantic" option enabled.

The vulnerabilities are reported in Asterisk Open Source versions
1.4.22, 1.4.23, 1.4.23.1, all 1.6.0.x versions prior to 1.6.0.6, all
1.6.1.x versions prior to 1.6.1.0-rc2, and Asterisk Business Edition
version C.2.3.

SOLUTION:
Update to a fixed version.

Asterisk Open Source:
Update to version 1.4.23.2, 1.6.0.6, or 1.6.1.0-rc2.

Asterisk Business Edition:
Update to version C.2.3.2.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits bugs.digium.com user klaus3000.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2009-002.html

 

[wardmundy]

Note that we install 1.4.21.2 by default which is not listed as vulnerable in the Security Advisory. The reported code didn't exist in 1.4.21.2 as best I can tell.

 

[jroper]

pedantic=yes is not a highly used sip directive anyway.

I think there should only be a concern if you are using this directive.

Joe