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Asterisk main/udptl.c Buffer Overflows (AST-2011-002)



The remote VoIP server is affected by multiple buffer overflow vulnerabilities.


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.


Upgrade to Asterisk,,,, or later or Asterisk Business Edition C.3.6.3 or later.\nAlternatively, disable T.38 support by setting 't38pt_udptl' to 'no' in sip.conf and ensuring that the chan_ooh323 module is not loaded.