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CVE-2025-0673: GitLab Infinite Redirect Loop Vulnerability Leading to Potential Denial of Service

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Overview

The CVE-2025-0673 vulnerability is a critical flaw discovered in GitLab CE/EE which, if exploited, could lead to a denial of service (DoS) condition. This vulnerability affects all versions from 17.7 before 17.10.8, 17.11 before 17.11.4, and 18.0 before 18.0.2. The severity of this issue is underscored by its potential to compromise system integrity or result in data leakage.

Vulnerability Summary

CVE ID: CVE-2025-0673
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service and potential system compromise or data leakage

Affected Products

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Product | Affected Versions

GitLab CE | 17.7 before 17.10.8
GitLab EE | 17.7 before 17.10.8, 17.11 before 17.11.4, and 18.0 before 18.0.2

How the Exploit Works

An attacker exploiting CVE-2025-0673 can trigger an infinite redirect loop within GitLab’s functionality. This loop consumes resources, potentially leading to a Denial of Service (DoS) condition, rendering the system unresponsive. This exploit could potentially compromise the system or lead to data leakage.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability using a malicious HTTP request:

GET /vulnerable/redirect HTTP/1.1
Host: victim.example.com

The attacker would craft a URL or control an endpoint which redirects back to itself, thus causing the infinite loop.

Mitigation Guidance

To mitigate this vulnerability, users are advised to apply the vendor-supplied patch as soon as possible. For immediate temporary mitigation, users can employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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