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

2024-09-0517:17:56

CWE-476

CWE-252

GitHub_M

www.cve.org

asterisk

sip

vulnerability

CVSS3

5.7

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

EPSS

Percentile

10.9%

JSON

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.

CNA Affected

[
  {
    "vendor": "asterisk",
    "product": "asterisk",
    "versions": [
      {
        "version": "< 18.24.3",
        "status": "affected"
      },
      {
        "version": ">= 19.0.0, < 20.9.3",
        "status": "affected"
      },
      {
        "version": ">= 21.0.0, < 21.4.3",
        "status": "affected"
      },
      {
        "version": "< 18.9-cert12",
        "status": "affected"
      },
      {
        "version": ">= 19.0, < 20.7-cert2",
        "status": "affected"
      }
    ]
  }
]