#VU64471 Improper Verification of Cryptographic Signature in Google API Client Library for Java - CVE-2021-22573

Vulnerability identifier: #VU64471

Vulnerability risk: Low

CVSSv4.0: 5.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-22573

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Google API Client Library for Java
Universal components / Libraries / Libraries used by multiple products

Vendor: Google

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

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

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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.