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CVE-2024-42491

5.7 · MEDIUM

Asterisk is an open-source private branch exchange (PBX).

Published Sep 5, 2024CWE-252EPSS 0.58%

Overview

CVE-2024-42491 is a medium-severity vulnerability. It was published on September 5, 2024 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

GitHubgithub.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4GitHubgithub.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742GitHubgithub.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2GitHubgithub.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8GitHubgithub.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0GitHubgithub.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9Reflists.debian.org/debian-lts-announce/2024/10/msg00016.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-42491?

CVE-2024-42491 is a medium-severity vulnerability. It was published on September 5, 2024 and has a CVSS 3.1 base score of 5.7 (MEDIUM).

How severe is CVE-2024-42491?

This vulnerability has a CVSS 3.1 base score of 5.7, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-42491?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2024-42491?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-42491 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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