[UNIX] SIP Channel Driver BYE Vulnerability

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SIP Channel Driver BYE Vulnerability
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SUMMARY

The handling of the BYE with Also transfer method was broken during the
development of Asterisk 1.4. If a transfer attempt is made using this
method the system will immediately crash upon handling the BYE message due
to trying to copy data into a NULL pointer. It is important to note that a
dialog must have already been established and up in order for this to
happen.

DETAILS

Vulnerable Systems:
* Asterisk Open Source versions prior to 1.4.17
* Asterisk Business Edition versions prior to C.1.0-beta8
* AsteriskNOW versions prior to beta7
* Asterisk Appliance Developer Kit versions prior to Asterisk 1.4
revision 95946
* s800i (Asterisk Appliance) versions prior to 1.0.3.4

Immune Systems:
* Asterisk Open Source version 1.4.17
* Asterisk Business Edition version C.1.0
* AsteriskNOW version Beta7
* Asterisk Appliance Developer Kit version Asterisk 1.4 revision 95946
* s800i (Asterisk Appliance) version 1.0.3.4

Resolution:
A fix has been added so that the BYE with Also transfer method now
properly allocates and uses the transfer data structure. It will no longer
try to copy data into a NULL pointer and will operate properly.

ADDITIONAL INFORMATION

The information has been provided by <mailto:jcolp@digium.com> Joshua
Colp.
The original article can be found at:
<http://downloads.digium.com/pub/security/AST-2008-001.html>

http://downloads.digium.com/pub/security/AST-2008-001.html

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