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: $Revision: 1.14 $

Type: remote

Family: Misc.

Published: 2011/11/22

Modified: 2016/11/11

Dependencies: 63202

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 4.8

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

Temporal Vector: CVSS2#E:F/RL:U/RC:ND

Vulnerability Information

CPE: cpe:/a:digium:asterisk

Required KB Items: asterisk/sip_detected, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/06/28

Vulnerability Publication Date: 2011/06/28

Reference Information

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

BID: 47676, 48008, 48485

OSVDB: 73257, 74352