GHSA-X3M8-899R-F7C3

Vulnerability from github – Published: 2025-03-14 17:16 – Updated: 2025-03-16 21:34
VLAI?
Summary
xml-crypto Vulnerable to XML Signature Verification Bypass via DigestValue Comment
Details

Impact

An attacker may be able to exploit this vulnerability to bypass authentication or authorization mechanisms in systems that rely on xml-crypto for verifying signed XML documents. The vulnerability allows an attacker to modify a valid signed XML message in a way that still passes signature verification checks. For example, it could be used to alter critical identity or access control attributes, enabling an attacker to escalate privileges or impersonate another user.

Patches

All versions <= 6.0.0 are affected. Please upgrade to version 6.0.1.

If you are still using v2.x or v3.x please upgrade to the associated patch version.

Indicators of Compromise

When logging XML payloads, check for the following indicators. If the payload includes encrypted elements, ensure you analyze the decrypted version for a complete assessment. (If encryption is not used, analyze the original XML document directly). This applies to various XML-based authentication and authorization flows, such as SAML Response payloads.

Presence of Comments in DigestValue

A DigestValue should not contain comments. If you find comments within it, this may indicate tampering.

Example of a compromised DigestValue:

<DigestValue>
    <!--TBlYWE0ZWM4ODI1NjliYzE3NmViN2E1OTlkOGDhhNmI=-->
    c7RuVDYo83z2su5uk0Nla8DXcXvKYKgf7tZklJxL/LZ=
</DigestValue>

Code to test

Pass in the decrypted version of the document

decryptedDocument = ... // yours to implement

const digestValues = xpath.select(
  "//*[local-name()='DigestValue'][count(node()) > 1]",
  decryptedDocument,
);

if (digestValues.length > 0) {
  // Compromise detected, yours to implement
}
Severity ?
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "xml-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "6.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "xml-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "xml-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-29775"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-14T17:16:47Z",
    "nvd_published_at": "2025-03-14T18:15:32Z",
    "severity": "CRITICAL"
  },
  "details": "# Impact\nAn attacker may be able to exploit this vulnerability to bypass authentication or authorization mechanisms in systems that rely on xml-crypto for verifying signed XML documents. The vulnerability allows an attacker to modify a valid signed XML message in a way that still passes signature verification checks. For example, it could be used to alter critical identity or access control attributes, enabling an attacker to escalate privileges or impersonate another user.\n\n# Patches\nAll versions \u003c= 6.0.0 are affected. Please upgrade to version 6.0.1.\n\nIf you are still using v2.x or v3.x please upgrade to the associated patch version.\n\n# Indicators of Compromise\n\nWhen logging XML payloads, check for the following indicators. If the payload includes encrypted elements, ensure you analyze the decrypted version for a complete assessment. (If encryption is not used, analyze the original XML document directly). This applies to various XML-based authentication and authorization flows, such as SAML Response payloads.\n\n### Presence of Comments in `DigestValue`\nA `DigestValue` should **not** contain comments. If you find comments within it, this may indicate tampering.\n\n**Example of a compromised `DigestValue`:**\n```xml\n\u003cDigestValue\u003e\n    \u003c!--TBlYWE0ZWM4ODI1NjliYzE3NmViN2E1OTlkOGDhhNmI=--\u003e\n    c7RuVDYo83z2su5uk0Nla8DXcXvKYKgf7tZklJxL/LZ=\n\u003c/DigestValue\u003e\n```\n\n### Code to test\n\nPass in the decrypted version of the document\n```js\ndecryptedDocument = ... // yours to implement\n\nconst digestValues = xpath.select(\n  \"//*[local-name()=\u0027DigestValue\u0027][count(node()) \u003e 1]\",\n  decryptedDocument,\n);\n\nif (digestValues.length \u003e 0) {\n  // Compromise detected, yours to implement\n}\n```",
  "id": "GHSA-x3m8-899r-f7c3",
  "modified": "2025-03-16T21:34:52Z",
  "published": "2025-03-14T17:16:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/security/advisories/GHSA-x3m8-899r-f7c3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-29775"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/commit/28f92218ecbb8dcbd238afa4efbbd50302aa9aed"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/commit/886dc63a8b4bb5ae1db9f41c7854b171eb83aa98"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/commit/8ac6118ee7978b46aa56b82cbcaa5fca58c93a07"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/node-saml/xml-crypto"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/releases/tag/v2.1.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/releases/tag/v3.2.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/node-saml/xml-crypto/releases/tag/v6.0.1"
    },
    {
      "type": "WEB",
      "url": "https://workos.com/blog/samlstorm"
    }
  ],
  "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:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xml-crypto Vulnerable to XML Signature Verification Bypass via DigestValue Comment"
}


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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.



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