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

high Nessus Plugin ID 52157


A telephony application running on the remote host is affected by multiple buffer overflow vulnerabilities.


According 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.


Upgrade to Asterisk / / / 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.

See Also

Plugin Details

Severity: High

ID: 52157

File Name: asterisk_ast_2011_002.nasl

Version: 1.19

Type: remote

Published: 2/23/2011

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: Settings/ParanoidReport, asterisk/sip_detected

Exploit Ease: No known exploits are available

Patch Publication Date: 2/21/2011

Vulnerability Publication Date: 1/27/2011

Reference Information

CVE: CVE-2011-1147

BID: 46474

SECUNIA: 43429