CVE-2024-42491 Information

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.

Reference

https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9 https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4 https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742 https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2 https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8 https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0