CVE-2024-42491

5.7 · MEDIUM

Published Sep 5, 2024 sangoma CWE-252 EPSS 0.59% (46th pctl) CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Overview

CVE-2024-42491 is a medium-severity vulnerability affecting sangoma asterisk. 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 and patches from sangoma. 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

Vendor	Product	Versions	Status
sangoma	asterisk	>= 0, < 18.24.3	Affected
sangoma	certified_asterisk	>= 0, < 18.9	Affected

References

GitHub github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4 GitHub github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742 GitHub github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2 GitHub github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8 GitHub github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0 GitHub github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9 Ref lists.debian.org/debian-lts-announce/2024/10/msg00016.html

Frequently Asked Questions

What is CVE-2024-42491?

CVE-2024-42491 is a medium-severity vulnerability affecting sangoma asterisk. 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?

How can CyberStrike help with CVE-2024-42491?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-42491 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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HackBrowser

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