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CVE-2023-31147 (GCVE-0-2023-31147)

Vulnerability from cvelistv5 – Published: 2023-05-25 21:55 – Updated: 2025-02-13 16:49
VLAI
Title
Insufficient randomness in generation of DNS query IDs in c-ares
Summary
c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-16 18:25 UTC
CWE
  • CWE-330 - Use of Insufficiently Random Values
Assigner
References
Impacted products
Vendor Product Version CPE status
c-ares c-ares Affected: < 1.19.1
guessed Create a notification for this product.
Show details on NVD website
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "c-ares: Insufficient randomness in generation of DNS query IDs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-31147.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:26:19Z",
      "cve": "CVE-2023-31147",
      "id": "CVE-2023-31147",
      "initial_release_date": "2023-05-23T02:54:33Z",
      "product_status:known_affected": "295",
      "product_status:recommended": "485",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-31147",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-31147.json",
      "version": "71"
    },
    "vulnrichment": {
      "containers": {
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            "providerMetadata": {
              "dateUpdated": "2024-08-02T14:45:25.630Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "references": [
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              {
                "name": "https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1",
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                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/"
              },
              {
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                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/"
              },
              {
                "tags": [
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                "url": "https://security.gentoo.org/glsa/202310-09"
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-31147",
                    "options": [
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                      },
                      {
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                    "timestamp": "2025-01-16T18:25:39.252161Z",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              "value": "c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1."
            }
          ],
          "metrics": [
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              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
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          "problemTypes": [
            {
              "descriptions": [
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                  "description": "CWE-330: Use of Insufficiently Random Values",
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              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1"
            },
            {
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/"
            },
            {
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/"
            },
            {
              "url": "https://security.gentoo.org/glsa/202310-09"
            }
          ],
          "source": {
            "advisory": "GHSA-8r8p-23f3-64c2",
            "discovery": "UNKNOWN"
          },
          "title": "Insufficient randomness in generation of DNS query IDs in c-ares"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2023-31147",
        "datePublished": "2023-05-25T21:55:47.585Z",
        "dateReserved": "2023-04-24T21:44:10.418Z",
        "dateUpdated": "2025-02-13T16:49:46.904Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


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.