CVE-2024-42491
Last modified
CVE-2024-42491 is a medium-severity vulnerability rated 5.7/10 on the CVSS scale. 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. EPSS estimates a 0.55% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Sangoma | Asterisk | < 18.24.3 | — |
| Sangoma | Asterisk | >= 20.0.0, < 20.9.3 | — |
| Sangoma | Asterisk | >= 21.0.0, <= 21.4.3 | — |
| Sangoma | Certified Asterisk | < 18.9 | — |
| Sangoma | Certified Asterisk | 18.9 | — |
| Sangoma | Certified Asterisk | 20.7 | Cert1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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