CVE-2022-39205 : What You Need to Know

Onedev, an open-source self-hosted Git Server with CI/CD and Kanban, is vulnerable to an access control bypass issue that affects versions prior to 7.3.0. This vulnerability allows unauthenticated users to take over an instance of OneDev, potentially leading to the execution of arbitrary code. Users are strongly advised to upgrade to version 7.3.0 to mitigate this critical security risk.

Understanding CVE-2022-39205

This section provides insights into the impact, technical details, and mitigation strategies for the CVE-2022-39205 affecting Onedev.

What is CVE-2022-39205?

Onedev versions before 7.3.0 are susceptible to an unauthenticated access control bypass vulnerability. Attackers can exploit the /git-prereceive-callback endpoint to execute arbitrary code by manipulating query parameters, posing a significant risk to the integrity, confidentiality, and availability of Onedev instances.

The Impact of CVE-2022-39205

The CVSS score for CVE-2022-39205 is 9 (Critical), highlighting the severity of this vulnerability. With a high attack complexity and impact on confidentiality, integrity, and availability, this security issue poses a considerable threat to Onedev deployments. As no workarounds are available, immediate action is necessary to prevent exploitation.

Technical Details of CVE-2022-39205

This section delves into the specifics of the vulnerability, including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper authentication mechanisms in Onedev versions earlier than 7.3.0, allowing unauthenticated users to exploit the /git-prereceive-callback endpoint to execute malicious code, potentially leading to control over the application.

Affected Systems and Versions

Onedev instances running versions below 7.3.0 are vulnerable to this security flaw. Users operating affected versions are at risk of unauthorized access and arbitrary code execution by malicious actors.

Exploitation Mechanism

By manipulating query parameters in requests to the /git-prereceive-callback endpoint, attackers can influence the environment variables of command execution, enabling them to write to arbitrary files and execute arbitrary code within the application context.

Mitigation and Prevention

Protecting Onedev instances from CVE-2022-39205 requires immediate action and the implementation of robust security practices to prevent unauthorized access and code execution.

Immediate Steps to Take

Users should upgrade their Onedev installations to version 7.3.0 or newer to mitigate this vulnerability. Timely patching is crucial to prevent potential exploitation and secure Onedev environments against unauthorized access.

Long-Term Security Practices

In addition to patching, organizations should adopt security measures such as implementing strong authentication mechanisms, restricting access to critical endpoints, and regularly monitoring and auditing system activity to detect anomalies.

Patching and Updates

Regularly applying software updates and security patches is essential to address known vulnerabilities and protect against potential threats. By staying informed about the latest releases and security advisories from Onedev, users can proactively secure their environments against emerging risks.