CVE-2024-42491

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.

How to fix CVE-2024-42491

To remediate CVE-2024-42491, upgrade the affected package to a fixed version below.

• —upgrade to 18.24.3-r0 or later
• —upgrade to 1:16.28.0~dfsg-0+deb11u5 or later

Is CVE-2024-42491 being exploited?

Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 18.24.3-r0
• from 0, < 1:16.28.0~dfsg-0+deb11u5

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2024-42491
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2024-42491