chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x
before 188.8.131.52.1 and 1.8.x before 184.108.40.206 does not properly handle
'\0' characters in SIP packets, which allows remote attackers to cause
a denial of service (memory corruption) or possibly have unspecified
other impact via a crafted packet.
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