CVE-2021-25777 : Vulnerability Insights and Analysis

In JetBrains TeamCity before 2020.2.1, permissions during token removal were checked improperly.

Understanding CVE-2021-25777

This CVE describes a vulnerability in JetBrains TeamCity related to improper permission checks during token removal.

What is CVE-2021-25777?

The CVE-2021-25777 vulnerability specifically relates to JetBrains TeamCity software versions prior to 2020.2.1. It stems from inadequate checking of permissions during the removal of tokens.

The Impact of CVE-2021-25777

Due to this security flaw, unauthorized users could potentially manipulate tokens, leading to unauthorized access or other malicious activities within the affected JetBrains TeamCity systems.

Technical Details of CVE-2021-25777

The technical aspects of the CVE-2021-25777 vulnerability include:

Vulnerability Description

The vulnerability arises from improper permission validation during the process of token removal in JetBrains TeamCity.

Affected Systems and Versions

All JetBrains TeamCity instances before version 2020.2.1 are affected by this vulnerability.

Exploitation Mechanism

An attacker could exploit this vulnerability by bypassing inadequate permission checks during token removal, potentially gaining unauthorized access to the system.

Mitigation and Prevention

To address and prevent the risks associated with CVE-2021-25777, consider the following measures:

Immediate Steps to Take

Update JetBrains TeamCity to version 2020.2.1 or later to mitigate this vulnerability.
Monitor access logs for any suspicious activities or unauthorized token removals.

Long-Term Security Practices

Regularly audit and review permissions and access controls within the JetBrains TeamCity environment.
Educate staff on best practices for handling tokens and sensitive information.

Patching and Updates

Ensure timely installation of security patches and updates for JetBrains TeamCity to address known vulnerabilities and enhance system security.