CVE-2020-36233 : Security Advisory and Response

Atlassian Bitbucket Server and Data Center versions before 6.10.9, 7.x before 7.6.4, and from 7.7.0 before 7.10.1 are vulnerable to privilege escalation due to weak permissions.

Understanding CVE-2020-36233

This CVE involves a security vulnerability in Atlassian Bitbucket Server and Data Center that allows local attackers to escalate privileges.

What is CVE-2020-36233?

The Microsoft Windows Installer for Atlassian Bitbucket Server and Data Center versions before 6.10.9, 7.x before 7.6.4, and from 7.7.0 before 7.10.1 has weak permissions on the installation directory, enabling local attackers to escalate privileges.

The Impact of CVE-2020-36233

The vulnerability can be exploited by local attackers to gain elevated privileges on the affected systems, potentially leading to unauthorized access and control.

Technical Details of CVE-2020-36233

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability arises from weak permissions on the installation directory of Atlassian Bitbucket Server and Data Center, allowing local attackers to escalate their privileges.

Affected Systems and Versions

Bitbucket Server versions less than 6.10.9, 7.0.0, 7.6.4, and 7.10.1 are affected.
Bitbucket Data Center versions less than 6.10.9, 7.0.0, 7.6.4, and 7.10.1 are also impacted.

Exploitation Mechanism

Local attackers can exploit the weak permissions on the installation directory to gain escalated privileges on the affected Bitbucket Server and Data Center versions.

Mitigation and Prevention

Protect your systems from CVE-2020-36233 with the following measures:

Immediate Steps to Take

Update Atlassian Bitbucket Server and Data Center to versions 6.10.9, 7.6.4, or 7.10.1 to mitigate the vulnerability.
Monitor and restrict access to the installation directories to prevent unauthorized changes.

Long-Term Security Practices

Implement the principle of least privilege to limit user access rights.
Regularly audit and review permissions on critical directories to ensure security.

Patching and Updates

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