CVE-2017-0923 : Security Advisory and Response

Gitlab Community Edition version 9.1 is vulnerable to lack of input validation in the IPython notebooks component, leading to persistent cross-site scripting.

Understanding CVE-2017-0923

The following details provide insights into the impact, technical aspects, and mitigation strategies related to CVE-2017-0923.

What is CVE-2017-0923?

The vulnerability in GitLab Community Edition exposes users to persistent cross-site scripting due to a lack of input validation in the IPython notebooks component.

The Impact of CVE-2017-0923

The vulnerability allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to unauthorized access, data theft, and other security breaches.

Technical Details of CVE-2017-0923

This section delves into the specific technical aspects of the CVE-2017-0923 vulnerability.

Vulnerability Description

The lack of input validation in the IPython notebooks component of GitLab Community Edition version 9.1 enables persistent cross-site scripting attacks.

Affected Systems and Versions

Product: GitLab Community and Enterprise Editions
Vendor: GitLab
Vulnerable Versions: 9.1.0 - 10.1.5 (Fixed in 10.1.6), 10.2.0 - 10.2.5 (Fixed in 10.2.6), 10.3.0 - 10.3.3 (Fixed in 10.3.4)

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into IPython notebooks, which are then executed when accessed by other users, leading to cross-site scripting attacks.

Mitigation and Prevention

Effective measures to mitigate and prevent the exploitation of CVE-2017-0923 are crucial for maintaining system security.

Immediate Steps to Take

Update GitLab to the fixed versions: 10.1.6, 10.2.6, 10.3.4
Implement input validation mechanisms to prevent cross-site scripting attacks

Long-Term Security Practices

Regularly monitor and audit web applications for vulnerabilities
Educate developers and users on secure coding practices to prevent similar issues

Patching and Updates

Stay informed about security updates and patches released by GitLab
Promptly apply patches to ensure that known vulnerabilities are addressed