Asterisk main/udptl.c Buffer Overflows (AST-2011-002)
High Nessus Plugin ID 52157
SynopsisA telephony application running on the remote host is affected by multiple buffer overflow vulnerabilities.
DescriptionAccording to the version in its SIP banner, the version of Asterisk running on the remote host may be vulnerable to heap- and stack-buffer overflow attacks with specially crafted UDPTL packets.
Successful exploitation requires T.38 support to be enabled on the target, which is not the default, and can allow execution of arbitrary code in the context of the Asterisk server or an application crash.
Note that Nessus has not determined whether T.38 is actually enabled so this finding may be a false positive.
SolutionUpgrade to Asterisk 126.96.36.199 / 188.8.131.52 / 184.108.40.206.2 / 220.127.116.11 or Asterisk Business Edition C.3.6.3 or later.
Alternatively, disable T.38 support by setting 't38pt_udptl' to 'no' in 'sip.conf' and ensuring that the chan_ooh323 module is not loaded.