Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXhtaDktcmc2Zi1qM21y

Verification flaw in Solid identity-token-verifier

Impact

Severity

Any Pod on a Solid server using a vulnerable version of the identity-token-verifier library is at risk of a spoofed Demonstration of Proof-of-Possession (DPoP) token binding. This vulnerability could give total and complete access to a targeted Pod.

Summary

A verification flaw in the implementation of the identity token verifier library (https://github.com/solid/identity-token-verifier) allows DPoP proofs to be spoofed.

DPoP proofs are used to bind access tokens to a private key meant to be in sole possession of a specific user. Instead of verifying against the hash of an embedded public key, the library instead verifies against a field that an attacker can modify to spoof another user’s DPoP.

A stolen DPoP proof, when used in the right context, therefore allows the rebinding of a DPoP-bound access token. Any attacker in possession of a targeted access token could build an attack environment to replay it on any Pod service with this vulnerability.

Patches

A new version 0.5.2 of identity-token-verifier fixes the verification: https://github.com/solid/identity-token-verifier/blob/7e18d86d65ee681e8ae912b6a032a1bae3cae570/src/lib/DPoP.ts#L25-L35

Workarounds

None

References

Are there any links users can visit to find out more?

For more information

If you have any questions or comments about this advisory:

• Open an issue in the identity-token-verifier repository.
• Email: [email protected]

Permalink: https://github.com/advisories/GHSA-xmh9-rg6f-j3mr
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXhtaDktcmc2Zi1qM21y
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 2 years ago
Updated: 5 months ago

Identifiers: GHSA-xmh9-rg6f-j3mr
References:

• https://github.com/solid/identity-token-verifier/security/advisories/GHSA-xmh9-rg6f-j3mr
• https://github.com/solid/identity-token-verifier/commit/fbdeb4aa8c12694b3744cd0454acb826817d9e6c
• https://github.com/solid/identity-token-verifier/releases/tag/0.5.2
• https://www.npmjs.com/package/@solid/identity-token-verifier
• https://github.com/advisories/GHSA-xmh9-rg6f-j3mr

Affected Packages