Vulnerability-Lookup

VAR-202409-2372

Vulnerability from variot - Updated: 2025-11-18 15:23

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. Sangoma of Asterisk and certified asterisk vulnerabilities related to unchecked return values, NULL There is a vulnerability in pointer dereference.Service operation interruption (DoS) It may be in a state

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CVE-2024-42491 (GCVE-0-2024-42491)

Vulnerability from cvelistv5 – Published: 2024-09-05 17:17 – Updated: 2025-11-03 22:04

Title

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

Summary

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.

Severity

5.7 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-05 18:48 UTC

CWE

CWE-252 - Unchecked Return Value
CWE-476 - NULL Pointer Dereference

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/asterisk/asterisk/security/adv…	x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/42a2f…	x_refsource_MISC
https://github.com/asterisk/asterisk/commit/4f016…	x_refsource_MISC
https://github.com/asterisk/asterisk/commit/50bf8…	x_refsource_MISC
https://github.com/asterisk/asterisk/commit/7a009…	x_refsource_MISC
https://github.com/asterisk/asterisk/commit/a1505…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2024…

Impacted products

1 product

Vendor	Product	Version
asterisk	asterisk	Affected: < 18.24.3 Affected: >= 19.0.0, < 20.9.3 Affected: >= 21.0.0, < 21.4.3 Affected: < 18.9-cert12 Affected: >= 19.0, < 20.7-cert2

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JSON

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          "name": "https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8"
        },
        {
          "name": "https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0"
        }
      ],
      "source": {
        "advisory": "GHSA-v428-g3cw-7hv9",
        "discovery": "UNKNOWN"
      },
      "title": "A malformed Contact or Record-Route URI in an incoming SIP request can cause Asterisk to crash when res_resolver_unbound is used"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2024-42491",
    "datePublished": "2024-09-05T17:17:56.961Z",
    "dateReserved": "2024-08-02T14:13:04.619Z",
    "dateUpdated": "2025-11-03T22:04:56.291Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

VAR-202409-2372

CVE-2024-42491 (GCVE-0-2024-42491)

Tags

Sightings

Nomenclature

Related by attack behaviour