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CVE-2011-4597

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Date: December 14, 2011

The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.

Language: C

Severity Score

Related Resources (11)

http://www.debian.org/security/2011/dsa-2367
https://nvd.nist.gov/vuln/detail/CVE-2011-4597
http://archives.neohapsis.com/archives/bugtraq/2011-12/0151.html
http://osvdb.org/77597
http://lists.digium.com/pipermail/asterisk-dev/2011-November/052191.html
https://security-tracker.debian.org/tracker/CVE-2011-4597
http://downloads.asterisk.org/pub/security/AST-2011-013.html
http://secunia.com/advisories/47273
http://openwall.com/lists/oss-security/2011/12/09/3
http://openwall.com/lists/oss-security/2011/12/09/4
https://www.mend.io/vulnerability-database/CVE-2011-4597

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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