GHSA-ff5x-w9wg-h275 Holder can generate proof of ownership for credentials it does not control in vp-toolkit

Not scored Published 6 Mar 2020

Attackers can forge ownership proofs for credentials they do not control, bypassing verification checks in the vp-toolkit library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is GHSA-ff5x-w9wg-h275?

GHSA-ff5x-w9wg-h275 is an authentication bypass vulnerability in vp-toolkit, published on 6 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Impact

The verifyVerifiablePresentation() method check the cryptographic integrity of the Verifiable Presentation, but it does not check if the credentialSubject.id DID matches the signer of the VP proof.

The verifier is impacted by this vulnerability.

Patches

Patch will be available in version 0.2.2.

Workarounds

Compute the address out of the verifiablePresentation.proof.n.verificationMethod using getAddressFromPubKey() from [email protected] and match it with the credentialSubject.id address from the credential.

References

Github issue

For more information

If you have any questions or comments about this advisory:

Discuss in the existing issue
Contact me

Which versions are affected by GHSA-ff5x-w9wg-h275?

2 open source packages ship an affected version, including vp-toolkit.

Package	Affected	Fixed in
`vp-toolkit` npm	All versions	`0.2.2`
`vp-toolkit` npm	All versions	`0.2.2`

How do I fix GHSA-ff5x-w9wg-h275?

Upgrade vp-toolkit to 0.2.2 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is GHSA-ff5x-w9wg-h275 being exploited?

There is no known exploitation of GHSA-ff5x-w9wg-h275 in the wild and no public exploit code.