Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sangoma | Asterisk | < 18.24.3 |
| Sangoma | Certified Asterisk | < 18.9 |
Related Weaknesses (CWE)
References
- https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e3Patch
- https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf620Patch
- https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d5Patch
- https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e46Patch
- https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41Patch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/10/msg00016.html
FAQ
What is CVE-2024-42491?
CVE-2024-42491 is a vulnerability with a CVSS score of 5.7 (MEDIUM). 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 ...
How severe is CVE-2024-42491?
CVE-2024-42491 has been rated MEDIUM with a CVSS base score of 5.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-42491?
Check the references section above for vendor advisories and patch information. Affected products include: Sangoma Asterisk, Sangoma Certified Asterisk.