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TITLE:
Asterisk T.38 SDP Buffer Overflows and Management Interface Denial of
Service

SECUNIA ADVISORY ID:
SA24977

VERIFY ADVISORY:
http://secunia.com/advisories/24977/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/

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

1) Two boundary errors exist in the T.38 SDP parser of the SIP
channel when processing the "T38FaxRateManagement" or "T38FaxUdpEC"
SDP parameters within the "process_sdp()" function in chan_sip.c.
This can be exploited to cause stack-based buffer overflows by
sending a specially crafted SIP packet with overly long SDP
parameters.

Successful exploitation requires that the "t38_udptl" configuration
option is set to "yes".

The vulnerabilities is reported in the 1.4.x branch prior to version
1.4.3.

2) A NULL pointer dereference error exists within the authentication
mechanism of the Asterisk Remote Management Interface, which can be
exploited to crash the service.

Successful exploitation requires that the Management Interface is
enabled and a user without a password is configured in the
manager.conf file.

The vulnerability is reported in the 1.2.x branch before 1.2.18 and
the 1.4.x branch before 1.4.3.

SOLUTION:
Update to version 1.4.3.

PROVIDED AND/OR DISCOVERED BY:
1) Barrie Dempster, NGS Software
2) Reported by Digium Technical Support

ORIGINAL ADVISORY:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053969.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053968.html

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