CVE-2020-29436 Explained : Impact and Mitigation

Sonatype Nexus Repository Manager 3.x before 3.29.0 allows a user with admin privileges to configure the system to gain access to content outside of NXRM via an XXE vulnerability. This CVE was published on December 17, 2020, by MITRE.

Understanding CVE-2020-29436

This CVE affects Sonatype Nexus Repository Manager 3.x versions before 3.29.0, potentially exposing the system to unauthorized access.

What is CVE-2020-29436?

CVE-2020-29436 is an XML External Entity (XXE) vulnerability in Sonatype Nexus Repository Manager 3.x versions prior to 3.29.0, allowing an admin user to manipulate the system to access content beyond NXRM.

The Impact of CVE-2020-29436

The vulnerability could lead to unauthorized access to sensitive information and compromise the security of the affected systems.

Technical Details of CVE-2020-29436

Sonatype Nexus Repository Manager 3.x before version 3.29.0 is susceptible to the following:

Vulnerability Description

Admin users can exploit an XXE vulnerability to access content outside of NXRM.

Affected Systems and Versions

Sonatype Nexus Repository Manager 3.x versions before 3.29.0.

Exploitation Mechanism

Admin users with privileges can configure the system to exploit the XXE vulnerability and gain unauthorized access.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-29436.

Immediate Steps to Take

Upgrade Sonatype Nexus Repository Manager to version 3.29.0 or later to mitigate the vulnerability.
Restrict admin privileges to minimize the risk of unauthorized access.

Long-Term Security Practices

Regularly monitor and update the software to patch known vulnerabilities.
Conduct security assessments and audits to identify and address potential security gaps.

Patching and Updates

Apply patches and updates provided by Sonatype promptly to ensure the security of the system.