CVE-2021-29428 : Security Advisory and Response
Learn about CVE-2021-29428, a vulnerability in Gradle allowing local privilege escalation through the system temporary directory. Understand the impact, affected systems, exploitation, and mitigation steps.
In Gradle before version 7.0, on Unix-like systems, the system temporary directory can be created with open permissions that allow multiple users to create and delete files within it. This vulnerability could lead to a local privilege escalation scenario. Here's what you need to know about CVE-2021-29428.
Understanding CVE-2021-29428
This CVE highlights a security vulnerability in Gradle versions prior to 7.0, affecting Unix-like systems.
What is CVE-2021-29428?
The vulnerability allows attackers to quickly escalate privileges by manipulating files in the system temporary directory. It mainly impacts builds using certain script plugins and tests for Gradle plugins.
The Impact of CVE-2021-29428
With a CVSS base score of 8.8 (High Severity), the vulnerability can result in high confidentiality, integrity, and availability impacts. The attack complexity is low, while local access and changed scope are required.
Technical Details of CVE-2021-29428
The vulnerability's technical aspects are crucial to understanding its implications.
Vulnerability Description
The issue arises from open permissions in the system temporary directory, allowing unauthorized users to manipulate files and potentially escalate privileges.
Affected Systems and Versions
Gradle versions prior to 7.0 on Unix-like systems are affected. Systems with the 'sticky' bit set on the temporary directory are not vulnerable.
Exploitation Mechanism
Attackers can exploit the vulnerability by quickly deleting and recreating files in the system temporary directory, leading to privilege escalation.
Mitigation and Prevention
Addressing CVE-2021-29428 promptly is crucial for maintaining system security.
Immediate Steps to Take
Ensure the 'sticky' bit is set on Unix-like systems or consider moving the Java temporary directory to limit permissions. Upgrade to Gradle 7.0 to fix the vulnerability.
Long-Term Security Practices
Regularly update Gradle to the latest versions and follow security best practices to prevent similar vulnerabilities in the future.
Patching and Updates
The vulnerability has been patched with the release of Gradle 7.0. Stay informed about security advisories and apply updates promptly to mitigate risks.