CVE-2021-22573 : Security Advisory and Response

This article provides details about CVE-2021-22573, a vulnerability in Google-oauth-java-client affecting versions less than 1.33.2 that allows an attacker to provide a compromised token with a custom payload.

Understanding CVE-2021-22573

This CVE describes an issue in the Google-oauth-java-client library that could lead to improper signature verification, exposing the system to potential attacks.

What is CVE-2021-22573?

The vulnerability in CVE-2021-22573 arises from the IDToken verifier's failure to properly verify whether a token is correctly signed. This oversight allows an attacker to present a tampered token with a custom payload, which can elude validation checks on the client side.

The Impact of CVE-2021-22573

With a base score of 8.7 (High Severity) according to CVSS v3.1 metrics, this vulnerability has a profound impact on confidentiality, integrity, and user interaction. A successful exploitation could result in severe consequences for affected systems.

Technical Details of CVE-2021-22573

This section delves into the specific technical aspects related to CVE-2021-22573.

Vulnerability Description

The vulnerability allows an attacker to bypass signature verification, compromising the integrity and authenticity of tokens in Google-oauth-java-client versions less than 1.33.2.

Affected Systems and Versions

Google-oauth-java-client versions below 1.33.2 are susceptible to this vulnerability. Organizations using these versions are at risk and should take immediate action.

Exploitation Mechanism

By providing a malformed token with a custom payload, an attacker can trick the IDToken verifier into accepting the tampered token as valid, exploiting the lack of proper signature verification.

Mitigation and Prevention

In response to CVE-2021-22573, it is crucial to implement appropriate mitigation strategies and security measures.

Immediate Steps to Take

Upgrade to Google-oauth-java-client version 1.33.3 or above to address the signature verification issue and prevent potential exploitation by malicious actors.

Long-Term Security Practices

Enhance security practices by regularly updating libraries, performing security assessments, and staying informed about the latest vulnerabilities and patches.

Patching and Updates

Stay abreast of security advisories from Google and apply patches promptly to protect your systems from known vulnerabilities.