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OESA-2023-1313 (CVE-2023-32067)

Vulnerability from osv_openeuler – Published: 2023-06-03 11:05 – Updated: 2026-08-06 11:05 – Source website
VLAI
Summary
c-ares security update
Details

This is c-ares, an asynchronous resolver library. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple

Security Fix(es):

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.(CVE-2023-32067)

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.(CVE-2023-31147)

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "c-ares-debuginfo-1.18.1-6.oe2203sp1.aarch64.rpm",
          "c-ares-devel-1.18.1-6.oe2203sp1.aarch64.rpm",
          "c-ares-debugsource-1.18.1-6.oe2203sp1.aarch64.rpm",
          "c-ares-1.18.1-6.oe2203sp1.aarch64.rpm"
        ],
        "noarch": [
          "c-ares-help-1.18.1-6.oe2203sp1.noarch.rpm"
        ],
        "src": [
          "c-ares-1.18.1-6.oe2203sp1.src.rpm"
        ],
        "x86_64": [
          "c-ares-debuginfo-1.18.1-6.oe2203sp1.x86_64.rpm",
          "c-ares-devel-1.18.1-6.oe2203sp1.x86_64.rpm",
          "c-ares-debugsource-1.18.1-6.oe2203sp1.x86_64.rpm",
          "c-ares-1.18.1-6.oe2203sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP1",
        "name": "c-ares",
        "purl": "pkg:rpm/openEuler/c-ares\u0026distro=openEuler-22.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.1-6.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "This is c-ares, an asynchronous resolver library. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple\r\n\r\nSecurity Fix(es):\r\n\r\nc-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.(CVE-2023-32067)\r\n\r\nc-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.(CVE-2023-31147)",
  "id": "OESA-2023-1313",
  "modified": "2026-08-06T11:05:47Z",
  "published": "2023-06-03T11:05:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1313"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-32067"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "c-ares security update",
  "upstream": [
    "CVE-2023-32067"
  ]
}



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