GHSA-75RW-34Q6-72CR

Vulnerability from github – Published: 2022-06-17 00:38 – Updated: 2023-03-07 00:39
VLAI?
Summary
Signature forgery in Biscuit
Details

Impact

The paper Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin defines a way to forge valid Γ-signatures, an algorithm that is used in the Biscuit specification version 1. It would allow an attacker to create a token with any access level.

As Biscuit v1 was still an early version and not broadly deployed, we were able to contact all known users of Biscuit v1 and help them migrate to Biscuit v2. We are not aware of any active exploitation of this vulnerability.

Patches

The version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability. The Biscuit implementations in Rust, Haskell, Go, Java and Javascript all have published versions following the v2 specification.

Workarounds

There is no known workaround, any use of Biscuit v1 should be migrated to v2.

References

Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin

For more information

If you have any questions or comments about this advisory: * Open an issue in biscuit-auth/biscuit * Ask questions on Matrix

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "biscuit-auth"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "2.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/biscuit-auth/biscuit-go"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "com.clever-cloud:biscuit-java"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-31053"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-06-17T00:38:03Z",
    "nvd_published_at": "2022-06-13T20:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\nThe paper [Cryptanalysis of Aggregate \u0393-Signature and Practical Countermeasures in Application to Bitcoin](https://eprint.iacr.org/2020/1484) defines a way to forge valid \u0393-signatures, an algorithm that is used in the Biscuit specification version 1.\nIt would allow an attacker to create a token with any access level.\n\nAs Biscuit v1 was still an early version and not broadly deployed, we were able to contact all known users of Biscuit v1 and help them migrate to Biscuit v2.\nWe are not aware of any active exploitation of this vulnerability.\n\n### Patches\n\nThe version 2 of the specification mandates a different algorithm than gamma signatures and as such is not affected by this vulnerability. The Biscuit implementations in Rust, Haskell, Go, Java and Javascript all have published versions following the v2 specification.\n\n### Workarounds\n\nThere is no known workaround, any use of Biscuit v1 should be migrated to v2.\n\n### References\n[Cryptanalysis of Aggregate \u0393-Signature and Practical Countermeasures in Application to Bitcoin](https://eprint.iacr.org/2020/1484)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [biscuit-auth/biscuit](https://github.com/biscuit-auth/biscuit)\n* Ask questions on [Matrix](https://matrix.to/#/#biscuit-auth:matrix.org)\n",
  "id": "GHSA-75rw-34q6-72cr",
  "modified": "2023-03-07T00:39:38Z",
  "published": "2022-06-17T00:38:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-75rw-34q6-72cr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-31053"
    },
    {
      "type": "WEB",
      "url": "https://eprint.iacr.org/2020/1484"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-75rw-34q6-72cr"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/biscuit-auth/biscuit"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2022-0564"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Signature forgery in Biscuit"
}


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Sightings

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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.



Detection rules are retrieved from Rulezet.