CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
14.5%
Tokens 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.
Third-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:
the public key of the previous block (used in the signature)
the public keys part of the token symbol table (for public key interning in datalog expressions)
A third-part block request forged by a malicious user can trick the third-party authority into generating datalog trusting the wrong keypair.
Consider the following example (nominal case)
check if thirdparty("b") trusting ${pubkeyB}
thirdparty("b"); check if thirdparty("c") trusting ${pubkeyC}
Now, with a malicious user:
check if thirdparty("b") trusting ${pubkeyB}
thirdparty("c")
, signed with a keypair pubkeyD, privkeyD) they generateThirdPartyBlockRequest
publicKeys field and replace pubkeyD with pubkeyCthirdparty("b"); check if thirdparty("c") trusting ${pubkeyC}
thirdparty("b"); check if thirdparty("c") trusting ${pubkeyD}
Has the problem been patched? What versions should users upgrade to?
Is there a way for users to fix or remediate the vulnerability without upgrading?
Are there any links users can visit to find out more?
github.com/biscuit-auth/biscuit-java
github.com/biscuit-auth/biscuit-java/commit/2e05e7b3f8f2aae38f33294f19419e2d638cb564
github.com/biscuit-auth/biscuit-java/releases/tag/4.0.0
github.com/biscuit-auth/biscuit-java/security/advisories/GHSA-5hcj-rwm6-xmw4
github.com/biscuit-auth/biscuit/security/advisories/GHSA-rgqv-mwc3-c78m
nvd.nist.gov/vuln/detail/CVE-2024-41948