CVE-2024-41948: Biscuit Biscuit-java Vulnerable To Public Key Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5hcj-rwm6-xmw4",
  "modified" : "2024-11-18T16:26:57Z",
  "published" : "2024-07-31T18:48:40Z",
  "aliases" : [ "CVE-2024-41948" ],
  "summary" : "biscuit-java vulnerable to public key confusion in third party block",
  "details" : "### Impact\nTokens with third-party blocks containing trusted annotations generated through a third party block request. Due to implementation issues in biscuit-java,  third party block support in published versions is inoperating. Nevertheless, to synchronize with other implementations, we publish this advisory and the related fix.\n\n### Description\nThird-party blocks can be generated without transferring the whole token to the third-party authority. Instead, a `ThirdPartyBlock` request can be sent, providing only the necessary info to generate a third-party block and to sign it:\n\nthe public key of the previous block (used in the signature)\nthe public keys part of the token symbol table (for public key interning in datalog expressions)\nA third-part block request forged by a malicious user can trick the third-party authority into generating datalog trusting the wrong keypair.\n\nConsider the following example (nominal case)\n* Authority A emits the following token: `check if thirdparty(\"b\") trusting ${pubkeyB}`\n* The well-behaving holder then generates a third-party block request based on the token and sends it to third-party authority B\n* Third-party B generates the following third-party block `thirdparty(\"b\"); check if thirdparty(\"c\") trusting ${pubkeyC}`\n* The token holder now must obtain a third-party block from third party C to be able to use the token\n\nNow, with a malicious user:\n* Authority A emits the following token: `check if thirdparty(\"b\") trusting ${pubkeyB}`\n* The holder then attenuates the token with the following third party block `thirdparty(\"c\")`, signed with a keypair pubkeyD, privkeyD) they generate\n* The holder then generates a third-party block request based on this token, but alter the `ThirdPartyBlockRequest` publicKeys field and replace pubkeyD with pubkeyC\n* Third-party B generates the following third-party block `thirdparty(\"b\"); check if thirdparty(\"c\") trusting ${pubkeyC}`\n* Due to the altered symbol table, the actual meaning of the block is `thirdparty(\"b\"); check if thirdparty(\"c\") trusting ${pubkeyD}`\n* The attacker can now use the token without obtaining a third-party block from C.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n### References\n_Are there any links users can visit to find out more?_\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.biscuitsec:biscuit"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "4.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/biscuit-auth/biscuit-java/security/advisories/GHSA-5hcj-rwm6-xmw4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/biscuit-auth/biscuit/security/advisories/GHSA-rgqv-mwc3-c78m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-41948"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/biscuit-auth/biscuit-java/commit/2e05e7b3f8f2aae38f33294f19419e2d638cb564"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/biscuit-auth/biscuit-java"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/biscuit-auth/biscuit-java/releases/tag/4.0.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1259" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-07-31T18:48:40Z",
    "nvd_published_at" : "2024-08-01T22:15:28Z"
  }
}