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CVE-2011-4597

5.0 · MEDIUM

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…

Published Dec 15, 2011digiumCWE-200EPSS 3.16%

Overview

CVE-2011-4597 is a medium-severity vulnerability affecting digium asterisk. It was published on December 15, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refarchives.neohapsis.com/archives/bugtraq/2011-12/0151.htmlRefdownloads.asterisk.org/pub/security/AST-2011-013.htmlReflists.digium.com/pipermail/asterisk-dev/2011-November/052191.htmlRefopenwall.com/lists/oss-security/2011/12/09/3Refopenwall.com/lists/oss-security/2011/12/09/4Refosvdb.org/77597Refsecunia.com/advisories/47273Refwww.debian.org/security/2011/dsa-2367Refarchives.neohapsis.com/archives/bugtraq/2011-12/0151.htmlRefdownloads.asterisk.org/pub/security/AST-2011-013.html

How CyberStrike helps

Frequently asked questions

What is CVE-2011-4597?

CVE-2011-4597 is a medium-severity vulnerability affecting digium asterisk. It was published on December 15, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2011-4597?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-4597?

Check the references section for vendor advisories and patches from digium. Update asterisk to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-4597?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-4597 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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