EUVD-2024-2490

Comprehensive Technical Analysis of EUVD-2024-2490

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2024-2490, also known as CVE-2024-6886, pertains to an Improper Neutralization of Input During Web Page Generation, commonly referred to as Cross-site Scripting (XSS). This specific issue is classified as a Stored XSS vulnerability in the Gitea Open Source Git Server version 1.22.0.

Severity Evaluation:

• Base Score: 10.0 (Critical)
• Base Score Version: 4.0
• Base Score Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

The CVSS score of 10.0 indicates the highest level of severity. The vector string highlights that the vulnerability can be exploited remotely (AV:N) with low complexity (AC:L), does not require any special conditions (AT:N), and does not need user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (VC:H, VI:H, VA:H), and the scope change is also high (SC:H), affecting the security impact (SI:H) and availability impact (SA:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Stored XSS: An attacker can inject malicious scripts into the web application, which are then stored and executed when other users access the affected content.
• Phishing: Attackers can use the vulnerability to create convincing phishing pages that mimic the legitimate Gitea interface.
• Session Hijacking: Malicious scripts can steal session cookies, allowing attackers to hijack user sessions.
• Data Theft: Sensitive information can be exfiltrated through the injected scripts.

Exploitation Methods:

• Injecting Scripts: Attackers can inject JavaScript code into input fields that are not properly sanitized.
• Social Engineering: Users can be tricked into visiting malicious links that exploit the vulnerability.
• Automated Tools: Attackers can use automated tools to scan for and exploit XSS vulnerabilities.

3. Affected Systems and Software Versions

Affected Software:

• Gitea Open Source Git Server: Version 1.22.0

Affected Systems:

• Any system running Gitea Open Source Git Server version 1.22.0 is vulnerable to this XSS issue.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to Gitea version 1.22.1 or later, which includes the fix for this vulnerability.
• Input Sanitization: Ensure all user inputs are properly sanitized and encoded to prevent script injection.
• Content Security Policy (CSP): Implement a strong CSP to mitigate the impact of XSS attacks.

Long-term Mitigation:

• Regular Patching: Keep all software up to date with the latest security patches.
• Security Training: Educate developers and users about the risks of XSS and best practices for input validation.
• Web Application Firewall (WAF): Deploy a WAF to detect and block malicious input.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations and individuals using Gitea within the European Union. Given the critical nature of the vulnerability, it could lead to widespread data breaches, loss of sensitive information, and potential disruption of services. The high EPSS score of 10 indicates a high likelihood of exploitation, making it a priority for immediate remediation.

6. Technical Details for Security Professionals

Technical Overview:

• Vulnerability Type: Stored XSS
• Affected Component: Web page generation in Gitea
• Exploitability: High, due to low complexity and no user interaction required
• Impact: High, affecting confidentiality, integrity, and availability

References:

• NVD Entry: CVE-2024-6886
• Gitea Pull Request: Gitea Pull Request #31200
• Gitea Commit: Commit b6280f4d21309cfae7cc07f74173354c664d5e10
• Gitea Release Notes: Release of 1.22.1
• Go Vulnerability Database: GO-2024-3056

Conclusion: This vulnerability requires immediate attention from organizations using Gitea Open Source Git Server version 1.22.0. Upgrading to the latest version and implementing robust input validation and sanitization practices are critical steps to mitigate the risk. The high severity and exploitability of this vulnerability underscore the importance of proactive cybersecurity measures in protecting sensitive data and maintaining service integrity.