Improper Verification of Cryptographic Signature in Google API Client Library for Java

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU64471

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22573

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to IDToken verifier does not verify if token is properly signed. A remote authenticated user can provide a compromised token with custom payload and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Google API Client Library for Java: 1.19.0 - 1.33.2

External links

http://github.com/googleapis/google-oauth-java-client/pull/872
http://bugzilla.redhat.com/show_bug.cgi?id=2081879

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.