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CVE-2021-21245 : What You Need to Know

Critical CVE-2021-21245 impacts OneDev platform, allowing attackers pre-auth file upload. Learn about the vulnerability, impact, and mitigation steps.

OneDev, an all-in-one DevOps platform, before version 4.0.3 is vulnerable to arbitrary file upload through the AttachmentUploadServlet. Attackers can upload a WebShell to the server, potentially leading to compromise. The issue is mitigated in version 4.0.3 by restricting uploaded files to the attachments folder.

Understanding CVE-2021-21245

This vulnerability in OneDev allows for pre-authentication arbitrary file upload, posing a critical risk to confidentiality and integrity.

What is CVE-2021-21245?

OneDev, a comprehensive DevOps platform, allows attackers to upload arbitrary files before version 4.0.3, leading to potential server compromise.

The Impact of CVE-2021-21245

The vulnerability enables malicious actors to upload a WebShell to the server, jeopardizing the system's security and integrity.

Technical Details of CVE-2021-21245

The vulnerability allows the upload of arbitrary files, potentially leading to a compromised server environment.

Vulnerability Description

The flaw in OneDev prior to version 4.0.3 permits attackers to upload arbitrary files via the AttachmentUploadServlet, risking server compromise.

Affected Systems and Versions

OneDev versions earlier than 4.0.3 are impacted by this vulnerability, exposing systems to arbitrary file uploads.

Exploitation Mechanism

Attackers exploit the vulnerability by uploading malicious files via the AttachmentUploadServlet, potentially achieving server compromise.

Mitigation and Prevention

It is crucial to take immediate steps to secure systems and prevent exploitation of CVE-2021-21245.

Immediate Steps to Take

Update OneDev to version 4.0.3 or later to mitigate the vulnerability and enhance system security.

Long-Term Security Practices

Regularly monitor for security updates and follow best practices to ensure the ongoing protection of systems.

Patching and Updates

Stay informed about security patches and updates related to OneDev to address vulnerabilities promptly.

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