Asterisk Invalid INVITE / REGISTER SIP Request Username Enumeration (AST-2011-011)

medium Nessus Plugin ID 56921


A telephony application running on the remote host is affected by an information disclosure vulnerability.


According to the version in its SIP banner, the version of Asterisk running on the remote host allows a remote attacker to enumerate valid users by sending malformed SIP INVITE and REGISTER requests.


Update to Asterisk / / / C.3.7.3 or later.

See Also

Plugin Details

Severity: Medium

ID: 56921

File Name: asterisk_ast_2011_011.nasl

Version: 1.16

Type: remote

Family: Misc.

Published: 11/22/2011

Updated: 4/11/2022

Configuration: Enable paranoid mode, Enable thorough checks

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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: 6/28/2011

Vulnerability Publication Date: 6/28/2011

Reference Information

CVE: CVE-2011-2536, CVE-2011-2666

BID: 47676, 48008, 48485