CVE-2018-20871 Explained : Impact and Mitigation

Univa Grid Engine before version 8.6.3 is susceptible to weak file permissions, specifically 'other' write access, when configured for Docker jobs and execd spooling on root_squash.

Understanding CVE-2018-20871

This CVE highlights a vulnerability in Univa Grid Engine that can lead to weak file permissions under specific configurations.

What is CVE-2018-20871?

The vulnerability in Univa Grid Engine before version 8.6.3 allows 'other' write access in certain scenarios, impacting the security of the system.

The Impact of CVE-2018-20871

The weak file permissions issue can potentially be exploited by malicious actors to gain unauthorized access or manipulate files on the affected system.

Technical Details of CVE-2018-20871

Unpacking the technical aspects of the vulnerability.

Vulnerability Description

Weak file permissions, particularly 'other' write access, can occur in Univa Grid Engine versions prior to 8.6.3 when configured for Docker jobs and execd spooling on root_squash.

Affected Systems and Versions

Univa Grid Engine versions before 8.6.3

Exploitation Mechanism

The vulnerability arises when Univa Grid Engine is set up for Docker jobs and execd spooling on root_squash, allowing unauthorized write access to files.

Mitigation and Prevention

Guidelines to address and prevent the CVE-2018-20871 vulnerability.

Immediate Steps to Take

Upgrade Univa Grid Engine to version 8.6.3 or newer to mitigate the weak file permissions issue.
Review and adjust file permissions to restrict unauthorized access.

Long-Term Security Practices

Regularly monitor and audit file permissions and access controls.
Implement the principle of least privilege to limit user access rights.

Patching and Updates

Stay informed about security updates and patches released by Univa Grid Engine to address vulnerabilities like CVE-2018-20871.