CVE-2024-22192: Ursa Ursa CL-Signatures Revocation Allows Verifiers Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6698-mhxx-r84g",
  "modified" : "2024-01-19T19:28:25Z",
  "published" : "2024-01-16T21:13:40Z",
  "aliases" : [ "CVE-2024-22192" ],
  "summary" : "Ursa CL-Signatures Revocation allows verifiers to generate unique identifiers for holders",
  "details" : "### Summary\n\nThe revocation scheme that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model. Notably, a malicious verifier may be able to generate a unique identifier for a holder providing a verifiable presentation that includes a Non-Revocation proof.\n\n### Details\n\nThe revocation scheme that is part of the Ursa CL-Signatures implementations has a flaw that could impact the privacy guarantees defined by the AnonCreds verifiable credential model, potentially allowing a malicious verifier to generate a unique identifier for a holder that provides a verifiable presentation that includes a Non-Revocation proof.\n\nThe flaws affects all CL-Signature versions published from the [Hyperledger Ursa] repository to the [Ursa Rust Crate], and is fixed in all versions published from the [Hyperledger AnonCreds CL-Signatures] repository to the [AnonCreds CL-Signatures Rust Crate].\n\nThe addressing the flaw requires updating AnonCreds holder software (such as mobile wallets) to a corrected CL-Signature implementation, such as the [AnonCreds CL Signatures Rust Crate]. Verifying presentations from corrected holders requires a updating the verifier software to a corrected CL-Signatures implementation. An updated verifier based on AnonCreds CL-Signatures can verify presentations from holders built on either the flawed Ursa CL-Signature implementation or a corrected CL-Signature implementation\n\n[Hyperledger Ursa]: https://github.com/hyperledger-archives/ursa\n[Ursa Rust Crate]: https://crates.io/crates/ursa\n[Hyperledger AnonCreds CL-Signatures]: https://github.com/hyperledger/anoncreds-clsignatures-rs\n[AnonCreds CL-Signatures Rust Crate]: https://crates.io/crates/anoncreds-clsignatures\n\nThe flaw occurs as a result of generating a verifiable presentation that includes a Non-Revocation proof from a flawed implementation.\n\n### Impact\nThe impact of the flaw is that a malicious verifier may be able to determine a unique identifier for a holder presenting a Non-Revocation proof.\n\n### Mitigation\n\nUpgrade libraries/holder applications that generate AnonCreds verifiable presentations using the [Ursa Rust Crate] to any version of the [AnonCreds CL-Signatures Rust Crate].",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "ursa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.3.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "anoncreds-clsignatures"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/hyperledger-archives/ursa/security/advisories/GHSA-6698-mhxx-r84g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-22192"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hyperledger/anoncreds-clsignatures-rs/commit/1e55780c890b027fa51e361e188a7743a0bf473f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hyperledger-archives/ursa"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-327" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-16T21:13:40Z",
    "nvd_published_at" : "2024-01-16T22:15:46Z"
  }
}