[UNIX] OPAL SIP Protocol DoS

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OPAL SIP Protocol DoS
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SUMMARY

OPAL (Open Phone Abstraction Layer) is "an implementation of various
telephony and video communication protocols for use over packet based
networks. It's based on code from the OpenH323 project and adds new
features such as a stream based architecture, better support for re-use or
removal of sub-components, and explicit support for additional protocols".
A vulnerability in OPAL allows attackers to cause the framework to crash
by sending it a malformed Content-Length value.

DETAILS

Vulnerable Systems:
* OPAL version 2.2.8
* Ekiga version 2.0.9

File: sippdu.cxx
Function: SIP_PDU::Read(OpalTransport & transport)
Instruction: entityBody[contentLength] = '\0';

An insufficient input validation of the Content-Length field of a SIP
request cause the application to crash due to a memory mismanagement.

Workaround:
A patch in the URL
<http://openh323.cvs.sourceforge.net/openh323/opal/src/sip/sippdu.cxx?r1=2.83.2.19&r2=2.83.2.20> http://openh323.cvs.sourceforge.net/openh323/opal/src/sip/sippdu.cxx?r1=2.83.2.19&r2=2.83.2.20 is available, but upgrading to new version 2.2.10 is recommended.

ADDITIONAL INFORMATION

The information has been provided by <mailto:jesparza@s21sec.com> Jose
Miguel Esparza.

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