ghsa-6qhv-4h7r-2g9m
Vulnerability from github
Published
2025-06-20 18:08
Modified
2025-06-27 22:02
Severity ?
9.3 (Critical) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
rfc3161-client has insufficient verification for timestamp response signatures
Details

Impact

rfc3161-client 1.0.2 and earlier contain a flaw in their timestamp response signature verification logic. In particular, it performs chain verification against the TSR's embedded certificates up to the trusted root(s), but fails to verify the TSR's own signature against the timestamping leaf certificates. Consequently, vulnerable versions perform insufficient signature validation to properly consider a TSR verified, as the attacker can introduce any TSR signature so long as the embedded leaf chains up to some root TSA.

Patches

Users should immediately upgrade to rfc3161-client 1.0.3 or later.

Workarounds

There is no workaround possible. Users should immediately upgrade to a fixed version.

Show details on source website

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.0.2"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "rfc3161-client"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-52556"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-06-20T18:08:40Z",
    "nvd_published_at": "2025-06-21T02:15:19Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\n`rfc3161-client` 1.0.2 and earlier contain a flaw in their timestamp response signature verification logic. In particular, it performs chain verification against the TSR\u0027s embedded certificates up to the trusted root(s), but fails to verify the TSR\u0027s own signature against the timestamping leaf certificates. Consequently, vulnerable versions perform insufficient signature validation to properly consider a TSR verified, as the attacker can introduce _any_ TSR signature so long as the embedded leaf chains up to some root TSA.\n\n### Patches\n\nUsers should immediately upgrade to `rfc3161-client` 1.0.3 or later.\n\n### Workarounds\n\nThere is no workaround possible. Users should immediately upgrade to a fixed version.",
  "id": "GHSA-6qhv-4h7r-2g9m",
  "modified": "2025-06-27T22:02:46Z",
  "published": "2025-06-20T18:08:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/trailofbits/rfc3161-client/security/advisories/GHSA-6qhv-4h7r-2g9m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52556"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trailofbits/rfc3161-client/commit/724a184f953e3f171f85cb223871172b41b0d0dc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trailofbits/rfc3161-client"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rfc3161-client has insufficient verification for timestamp response signatures"
}


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