tls-extra: certificate validation does not check Basic Constraints

tls-extra does not check the Basic Constraints extension of a certificate in certificate chain processing. Any certificate is treated as a CA certificate. As a consequence, anyone who has a valid certificate can use it to sign another one (with an arbitrary subject DN/domain name embedded into it) and have it accepted by tls. This allows MITM attacks on TLS connections.

JSON

To clipboard

{
  "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"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "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"
        }
      ]
    }
  ],
  "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": "2025-11-14T14:45:34Z",
  "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": "1.5.0",
  "summary": "tls-extra: certificate validation does not check Basic Constraints"
}

CVE-2013-0243 (GCVE-0-2013-0243)

Vulnerability from cvelistv5 – Published: 2019-12-05 15:16 – Updated: 2024-08-06 14:18

Summary

haskell-tls-extra before 0.6.1 has Basic Constraints attribute vulnerability may lead to Man in the Middle attacks on TLS connections

Severity ?

No CVSS data available.

CWE

constraints vulnerability

Assigner

redhat

References

URL

Tags

	https://security-tracker.debian.org/tracker/CVE-2…	x_refsource_MISC
	https://access.redhat.com/security/cve/cve-2013-0243	x_refsource_MISC
	http://www.openwall.com/lists/oss-security/2013/01/30/6	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	haskell-tls-extra	haskell-tls-extra	Affected: < 0.6.1

Show details on NVD website

JSON

To clipboard

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          }
        ],
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    ],
    "cna": {
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          "url": "http://www.openwall.com/lists/oss-security/2013/01/30/6"
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Sightings

Author	Source	Type	Date

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.

Action not permitted

hsec-2023-0005

Vulnerability from osv_haskell

tls-extra: certificate validation does not check Basic Constraints

CVE-2013-0243 (GCVE-0-2013-0243)

Tags

Sightings

Nomenclature