High-Severity Bug Reported in Google's OAuth Client Library for Java
May 19, 2022
Google last month addressed a high-severity flaw in its OAuth client library for Java that could be abused by a malicious actor with a compromised token to deploy arbitrary payloads. Tracked as CVE-2021-22573 , the vulnerability is rated 8.7 out of 10 for severity and relates to an authentication bypass in the library that stems from an improper verification of the cryptographic signature. Credited with discovering and reporting the flaw on March 12 is Tamjid Al Rahat , a fourth-year Ph.D. student of Computer Science at the University of Virginia, who has been awarded $5,000 as part of Google's bug bounty program. "The vulnerability is that the IDToken verifier does not verify if the token is properly signed," an advisory for the flaw reads. "Signature verification makes sure that the token's payload comes from a valid provider, not from someone else. An attacker can provide a compromised token with custom payload. The token will pass the validation on ...
