CVE-2021-31913 : Security Advisory and Response

JetBrains TeamCity before 2020.2.3 is affected by CVE-2021-31913 due to insufficient checks during GitHub SSO token exchange.

Understanding CVE-2021-31913

This CVE identifies a security vulnerability in JetBrains TeamCity that allows for improper handling of redirect_uri in GitHub SSO token exchange.

What is CVE-2021-31913?

The vulnerability in JetBrains TeamCity prior to 2020.2.3 arises from inadequate validation of the redirect_uri during GitHub SSO token exchange.

The Impact of CVE-2021-31913

Exploitation of this vulnerability could potentially lead to unauthorized access and security breaches in systems using JetBrains TeamCity.

Technical Details of CVE-2021-31913

This section covers a detailed analysis of the vulnerability.

Vulnerability Description

Insufficient checks of the redirect_uri during GitHub SSO token exchange in JetBrains TeamCity before version 2020.2.3.

Affected Systems and Versions

All versions of JetBrains TeamCity prior to 2020.2.3 are affected by this vulnerability.

Exploitation Mechanism

Attackers could exploit this vulnerability by manipulating the redirect_uri parameter during GitHub SSO token exchange to gain unauthorized access.

Mitigation and Prevention

Learn how to protect your systems from CVE-2021-31913.

Immediate Steps to Take

Update JetBrains TeamCity to version 2020.2.3 or later to mitigate the security risk posed by this vulnerability.

Long-Term Security Practices

Implement strict input validation mechanisms and regular security audits to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security patches and updates released by JetBrains to address CVE-2021-31913 and other potential vulnerabilities.