Cloud Defense Logo

Products

Solutions

Company

Book A Live Demo

CVE-2021-21242 : Vulnerability Insights and Analysis

Learn about CVE-2021-21242, a critical vulnerability in OneDev before version 4.0.3 that allows pre-auth remote code execution via unsafe deserialization in AttachmentUploadServet. Find out the impacts, technical details, and mitigation steps.

OneDev, an all-in-one devops platform, before version 4.0.3, is vulnerable to a critical pre-auth remote code execution issue due to unsafe deserialization in the AttachmentUploadServet. This vulnerability has a CVSS base score of 10 (Critical) and high impacts on confidentiality and integrity. Immediate patching and mitigation are crucial.

Understanding CVE-2021-21242

This section will delve into what CVE-2021-21242 entails, its impact, technical details, and mitigation strategies.

What is CVE-2021-21242?

CVE-2021-21242 refers to a critical vulnerability in OneDev before version 4.0.3 that allows pre-auth remote code execution. The issue stems from unsafe data deserialization in the AttachmentUploadServet without proper validation checks.

The Impact of CVE-2021-21242

The vulnerability poses a significant risk as threat actors can exploit it to execute malicious code remotely without authentication, potentially compromising the affected system's confidentiality and integrity.

Technical Details of CVE-2021-21242

Let's explore the technical aspects of CVE-2021-21242, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

In CVE-2021-21242, the AttachmentUploadServet in OneDev fails to validate data from the

Attachment-Support
header, enabling attackers to execute arbitrary code remotely without authentication, leading to severe consequences.

Affected Systems and Versions

OneDev versions earlier than 4.0.3 are vulnerable to CVE-2021-21242. Organizations using these versions are at risk of pre-auth remote code execution and should take immediate action to secure their systems.

Exploitation Mechanism

The vulnerability allows threat actors to craft malicious data in the

Attachment-Support
header, exploiting the deserialization process to achieve unauthorized remote code execution, bypassing any authentication or authorization checks.

Mitigation and Prevention

To safeguard systems against CVE-2021-21242, organizations must implement immediate remediation steps, adopt long-term security practices, and ensure timely patching and updates.

Immediate Steps to Take

Organizations should apply the necessary patches or updates provided by OneDev to address the vulnerability promptly. Additionally, restricting network access to vulnerable services can help mitigate the risk of exploitation.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and educating personnel on safe development techniques can enhance overall cybersecurity posture and prevent similar vulnerabilities in the future.

Patching and Updates

Staying informed about security advisories and promptly applying patches and updates released by OneDev are essential for mitigating vulnerabilities like CVE-2021-21242 and strengthening the overall security of the system.

Popular CVEs

CVE Id

Published Date

Is your System Free of Underlying Vulnerabilities?
Find Out Now