CVE-2020-4026 Explained : Impact and Mitigation

Atlassian Navigator Links before version 3.3.23, from version 4.0.0 before version 4.3.7, from version 5.0.0 before 5.0.1, and from version 5.1.0 before 5.1.1 allows remote attackers to enumerate all linked applications, including those that are restricted or hidden, through an incorrect authorization check.

Understanding CVE-2020-4026

This CVE involves an incorrect authorization vulnerability in Atlassian Navigator Links, potentially exposing restricted applications.

What is CVE-2020-4026?

The vulnerability in Atlassian Navigator Links allows unauthorized remote attackers to list all linked applications, even those that are meant to be restricted or hidden.

The Impact of CVE-2020-4026

The vulnerability could lead to unauthorized access to sensitive information and applications, compromising the security and confidentiality of the affected systems.

Technical Details of CVE-2020-4026

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The CustomAppsRestResource list resource in Atlassian Navigator Links is susceptible to an incorrect authorization check, enabling attackers to enumerate all linked applications.

Affected Systems and Versions

Navigator Links before 3.3.23
Navigator Links from 4.0.0 to 4.3.7
Navigator Links from 5.0.0 to 5.0.1
Navigator Links from 5.1.0 to 5.1.1
Crucible versions less than 4.8.2
Fisheye versions less than 4.8.2

Exploitation Mechanism

Attackers exploit the vulnerability by bypassing the authorization check, gaining unauthorized access to all linked applications within the affected versions.

Mitigation and Prevention

Protect your systems from CVE-2020-4026 with the following steps:

Immediate Steps to Take

Update Atlassian Navigator Links to versions 3.3.23, 4.3.7, 5.0.1, or 5.1.1 to mitigate the vulnerability.
Monitor and restrict access to sensitive applications and data.

Long-Term Security Practices

Implement strict access controls and regularly review authorization mechanisms.
Conduct security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply security patches and updates provided by Atlassian promptly to address known vulnerabilities.