Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2011-2536

Severity CVSS v4.0:
Pending analysis
Type:
CWE-200 Information Leak / Disclosure
Publication date:
06/07/2011
Last modified:
11/04/2025

Description

chan_sip.c in the SIP channel driver in Asterisk Open Source 1.4.x before 1.4.41.2, 1.6.2.x before 1.6.2.18.2, and 1.8.x before 1.8.4.4, and Asterisk Business Edition C.3.x before C.3.7.3, disregards the alwaysauthreject option and generates different responses for invalid SIP requests depending on whether the user account exists, which allows remote attackers to enumerate account names via a series of requests.

Impact

Vector 2.0
AV:N/AC:L/Au:N/C:P/I:N/A:N CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Physical
Integrity (I): None
Availability (A): None

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:digium:asterisk:1.8.0:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:beta1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:beta2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:beta3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:beta4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:beta5:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:rc2:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:rc3:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:rc4:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.0:rc5:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.1:rc1:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.1.1:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.1.2:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:1.8.2:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools