hsec-2023-0005

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2023/HSEC-2023-0005.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2023/HSEC-2023-0005.json",
        "source": "https://github.com/haskell/security-advisories/blob/generated/osv-export/2023/HSEC-2023-0005.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "tls-extra",
        "purl": "pkg:hackage/tls-extra"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.4.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "type": "CVSS_V3"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.1",
        "0.1.2",
        "0.1.3",
        "0.1.4",
        "0.1.5",
        "0.1.6",
        "0.1.7",
        "0.1.8",
        "0.1.9",
        "0.2.0",
        "0.2.1",
        "0.2.2",
        "0.2.3",
        "0.3.0",
        "0.3.1",
        "0.4.0",
        "0.4.1",
        "0.4.2",
        "0.4.2.1",
        "0.4.3",
        "0.4.4",
        "0.4.5",
        "0.4.6"
      ]
    }
  ],
  "aliases": [
    "CVE-2013-0243"
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# tls-extra: certificate validation does not check Basic Constraints\n\n*tls-extra* does not check the Basic Constraints extension of a\ncertificate in certificate chain processing.  Any certificate is\ntreated as a CA certificate.  As a consequence, anyone who has a\nvalid certificate can use it to sign another one (with an arbitrary\nsubject DN/domain name embedded into it) and have it accepted by\n*tls*.  This allows MITM attacks on TLS connections.\n",
  "id": "HSEC-2023-0005",
  "modified": "2025-11-14T18:15:34.407551Z",
  "published": "2025-11-14T14:45:34Z",
  "references": [
    {
      "type": "DISCUSSION",
      "url": "https://www.openwall.com/lists/oss-security/2013/01/30/6"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/haskell-tls/hs-tls/issues/29"
    },
    {
      "type": "FIX",
      "url": "https://github.com/haskell-tls/hs-tls/commit/15885c0649ceabd2f4d2913df8ac6dc63d6b3b37"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "tls-extra: certificate validation does not check Basic Constraints"
}