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Asterisk SIP Denial Of Service Vulnerability (INVITE)
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SUMMARY
AsteriskR is "a complete IP PBX in software. It runs on a wide variety of
operating systems including Linux, Mac OS X, OpenBSD, FreeBSD and Sun
Solaris and provides all of the features you would expect from a PBX
including many advanced features that are often associated with high end
(and high cost) proprietary PBXs".
After sending a crafted INVITE message the software finish abruptly its
execution with a Segmentation Fault provoking a Denial of Service (DoS) in
all the services provided by the entity.
DETAILS
Vulnerable Systems:
* Asterisk versions 1.2.14, 1.2.15, 1.2.16
* Asterisk version 1.4.1
* Previous versions are also suspected.
Immune Systems:
* Asterisk version 1.2.17
* Asterisk version 1.4.2
* Repository trunk version to date (13/03/2007)
After sending a crafted message the software crash abruptly. The message
in this case is an anonymous INVITE where the SDP contains 2 connection
headers. The first one must be valid and the second not where the IP
address should be invalid. The callee needs not to be a valid user or
dialplan. In case where asterisk is set to disallow anonymous call, a
valid user and password should be known, and while responding the
corresponding INVITE challenge the information should be crafted as above.
After this crafted SIP INVITE message, the affected software crash
immediately.
A remote individual can remotely crash and perform a Denial of
Service(DoS) attack in all the services provided by the software by
sending one crafted SIP INVITE message. This is conceptually similar to
the "ping of death".
ADDITIONAL INFORMATION
The information has been provided by <mailto:state@loria.fr> Radu State.
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