CVE-2021-21248 : Security Advisory and Response
Learn about CVE-2021-21248, a critical vulnerability in OneDev < 4.0.3 allowing attackers to execute arbitrary code through a Groovy script injection. Take immediate steps to update and secure your systems.
OneDev, an all-in-one DevOps platform, was found to have a critical vulnerability before version 4.0.3 that allows attackers to execute arbitrary code via a Groovy script injection.
Understanding CVE-2021-21248
This CVE involves a critical vulnerability in OneDev that allows attackers to run arbitrary code on the server through the build endpoint parameters.
What is CVE-2021-21248?
The vulnerability in OneDev before version 4.0.3 allows attackers to inject arbitrary Groovy code via job parameters, leading to the execution of arbitrary code on the server.
The Impact of CVE-2021-21248
The impact of this CVE is rated as critical, with a base score of 9.6. It has a high impact on confidentiality and integrity, requiring low privileges for exploitation.
Technical Details of CVE-2021-21248
The vulnerability involves the use of InputSpec to define parameters of a Build spec using dynamically generated Groovy classes.
Vulnerability Description
By manipulating job parameters, attackers can inject arbitrary Groovy code, resulting in the execution of arbitrary code on the OneDev server.
Affected Systems and Versions
OneDev versions below 4.0.3 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by injecting arbitrary Groovy code through job parameters, ultimately running unauthorized code on the server.
Mitigation and Prevention
To address CVE-2021-21248, it is crucial to take immediate action and implement long-term security measures.
Immediate Steps to Take
Users should update OneDev to version 4.0.3 or later, which fixes the vulnerability by escaping special characters from user input.
Long-Term Security Practices
Regular security audits, code reviews, and employee training on secure coding practices can help prevent similar exploits in the future.
Patching and Updates
Ensure timely installation of security patches and updates for OneDev to mitigate the risk of arbitrary code execution via Groovy script injection.