CVE-2021-26077 : Vulnerability Insights and Analysis

This CVE-2021-26077 article provides insights into a vulnerability found in Atlassian Connect Spring Boot (ACSB) that affects versions 1.1.0 through 2.1.5.

Understanding CVE-2021-26077

This section will cover the details of the vulnerability, its impact, technical aspects, and mitigation steps.

What is CVE-2021-26077?

CVE-2021-26077 involves Broken Authentication in Atlassian Connect Spring Boot (ACSB) versions 1.1.0 through 2.1.5. This vulnerability allows unauthorized access to app installation events by accepting erroneous context JWTs.

The Impact of CVE-2021-26077

The vulnerability permits an attacker to send authenticated re-installation events to an app by exploiting context JWTs in lifecycle endpoints intended for server-to-server JWT authentication.

Technical Details of CVE-2021-26077

Let's delve into the specifics of the vulnerability regarding its description, affected systems, and exploitation mechanism.

Vulnerability Description

Atlassian Connect Spring Boot versions 1.1.0 through 2.1.5 incorrectly accept context JWTs in critical endpoints, compromising authentication protocols.

Affected Systems and Versions

The vulnerability impacts Atlassian Connect Spring Boot versions 1.1.0 through 2.1.5, allowing unauthorized access to sensitive installation events.

Exploitation Mechanism

Attackers exploit the flawed authentication process by sending authenticated re-installation events using unauthorized context JWTs instead of server-to-server JWTs.

Mitigation and Prevention

Learn how to address and prevent the CVE-2021-26077 vulnerability with immediate and long-term security measures.

Immediate Steps to Take

To mitigate the risk, ensure that only server-to-server JWTs are accepted in lifecycle endpoints, enhancing security against unauthorized access.

Long-Term Security Practices

Implement secure coding practices and regular security audits to identify and address vulnerabilities throughout the development process.

Patching and Updates

Stay informed about security patches and updates released by Atlassian to address the Broken Authentication vulnerability in affected versions of Atlassian Connect Spring Boot.