CVE-2021-21692 : Vulnerability Insights and Analysis
Learn about CVE-2021-21692, a security flaw in Jenkins allowing unauthorized file deletion. Understand the impact, technical details, and mitigation steps for protection.
This CVE article discusses a security vulnerability in Jenkins that allows unauthorized deletion. Read on to understand the impact, technical details, and mitigation steps.
Understanding CVE-2021-21692
This section delves into the details of the security flaw in Jenkins.
What is CVE-2021-21692?
The vulnerability lies in FilePath#renameTo and FilePath#moveAllChildrenTo functions in Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier. These functions only check 'read' permissions instead of 'delete', thus allowing unauthorized deletion.
The Impact of CVE-2021-21692
The vulnerability poses a risk of unauthorized deletion of files as it incorrectly checks permissions, potentially leading to data loss or manipulation if exploited.
Technical Details of CVE-2021-21692
In this section, we discuss the technical aspects of the CVE.
Vulnerability Description
The vulnerability arises from the insufficient permission checks on certain file manipulation functions in vulnerable Jenkins versions.
Affected Systems and Versions
Jenkins versions 2.318 and earlier, LTS 2.303.2 and earlier, are affected by this security flaw, specifically when using 'read' agent-to-controller access permission.
Exploitation Mechanism
Attackers can exploit this vulnerability by leveraging the inadequate permission validation to perform unauthorized deletion operations on files.
Mitigation and Prevention
Learn how to address and prevent exploitation of CVE-2021-21692.
Immediate Steps to Take
As a precaution, users of affected Jenkins versions should consider updating to patched versions and enhancing access controls to prevent unauthorized file deletions.
Long-Term Security Practices
Establish robust file access controls, regularly update Jenkins to the latest version, and monitor file operations to mitigate similar security risks.
Patching and Updates
Jenkins users should apply security patches provided by the Jenkins project to address this vulnerability and strengthen overall system security.