CVE-2024-42491

MEDIUM EPSS 42.0%
Published Sep 5, 20241y ago · Modified Jun 17, 20262w ago
5.7 CVSS 3.1
Medium
Find Similar
Published Sep 5, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.7
Exploitability
2.1
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
42.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-252
CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 23

VendorProductVersionRange
sangomaasterisk* <18.24.3
sangomaasterisk*≥20.0.0  –  <20.9.3
sangomaasterisk*≥21.0.0  –  ≤21.4.3
sangomacertified_asterisk* <18.9
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk18.9any
sangomacertified_asterisk20.7any
sangomacertified_asterisk20.7any
sangomacertified_asterisk20.7any
sangomacertified_asterisk20.7any

References 7

  • github.com https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
    Patch
  • github.com https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/10/msg00016.html

Remediation

  • github.com https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
    Patch
  • github.com https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
    Patch