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CVE-2021-21250 : What You Need to Know

Learn about CVE-2021-21250, a critical vulnerability in OneDev before 4.0.3 allowing arbitrary file reads via XML external entity expansion. Mitigation steps included.

OneDev is an all-in-one devops platform with a critical vulnerability in versions older than 4.0.3, leading to arbitrary file read due to XML external entities expansion.

Understanding CVE-2021-21250

This CVE relates to a post-auth external entity expansion (XXE) vulnerability in OneDev versions prior to 4.0.3, potentially allowing attackers to read arbitrary files.

What is CVE-2021-21250?

CVE-2021-21250 refers to a critical vulnerability in OneDev that could result in arbitrary file read when XML external entities are allowed to expand, exposing sensitive information to attackers.

The Impact of CVE-2021-21250

The impact of this vulnerability is rated as high, with a CVSS base score of 7.7. It poses a significant risk to confidentiality and could lead to data exposure if not mitigated promptly.

Technical Details of CVE-2021-21250

In OneDev below version 4.0.3, a flaw allows external entities in XML files to read arbitrary files and potentially leak sensitive data. The issue was resolved in version 4.0.3 by disregarding ENTITY instructions in XML files.

Vulnerability Description

The vulnerability stems from the improper processing of XML documents containing external entities, enabling attackers to read arbitrary files from the system and extract their contents, risking data confidentiality.

Affected Systems and Versions

OneDev versions prior to 4.0.3 are affected by this vulnerability, making them susceptible to arbitrary file reads through XML external entity expansion.

Exploitation Mechanism

Attackers could exploit this vulnerability by manipulating XML files to access sensitive data on the system, potentially leaking confidential information stored within the platform.

Mitigation and Prevention

To safeguard against CVE-2021-21250, users should take immediate action and implement long-term security measures to mitigate the risk of arbitrary file reads.

Immediate Steps to Take

Immediate steps include updating OneDev to version 4.0.3 or newer, which addresses the vulnerability by ignoring ENTITY instructions in XML files.

Long-Term Security Practices

Enhancing system security by regularly monitoring for vulnerabilities, restricting access to sensitive data, and educating users on safe coding practices can help prevent similar exploits.

Patching and Updates

Regularly applying patches and updates provided by OneDev is crucial to maintaining a secure environment and preventing potential exploitation of known vulnerabilities.

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