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Vulnerability · Published Sep 5, 2024 · Assigned by GitHub_M

CVE-2024-42491A malformed Contact or Record-Route URI in an incoming SIP request can cause Asterisk to crash when res_resolver_unbound is used

Medium 5.7

In plain English

A medium-severity null pointer dereference in asterisk from asterisk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.7Medium
Exploit odds (30 days)0.6%top 52.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20asterisk20.9.3-r0ALPINE-CVE-2024-42491
Alpine:v3.21asterisk20.9.3-r0ALPINE-CVE-2024-42491
Alpine:v3.22asterisk20.9.3-r0ALPINE-CVE-2024-42491
Alpine:v3.23asterisk20.9.3-r0ALPINE-CVE-2024-42491
Alpine:v3.24asterisk20.9.3-r0ALPINE-CVE-2024-42491
Debian:14asterisk1:20.9.3~dfsg+~cs6.14.60671435-1DEBIAN-CVE-2024-42491
Ubuntu:22.04:LTSasteriskno fix listedUBUNTU-CVE-2024-42491
Ubuntu:24.04:LTSasteriskno fix listedUBUNTU-CVE-2024-42491
Ubuntu:25.10asteriskno fix listedUBUNTU-CVE-2024-42491
Ubuntu:26.04:LTSasteriskno fix listedUBUNTU-CVE-2024-42491
Ubuntu:26.10asteriskno fix listedUBUNTU-CVE-2024-42491

Affected products (as reported)

VendorProductVersions
asterisk asterisk < 18.24.3>= 19.0.0, < 20.9.3>= 21.0.0, < 21.4.3< 18.9-cert12>= 19.0, < 20.7-cert2

Weakness: CWE-252, CWE-476 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

References