EUVD-2024-3199

Comprehensive Technical Analysis of EUVD-2024-3199

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-3199 is a stored cross-site scripting (XSS) issue in the usememos/memos software version 0.9.1. This vulnerability allows an attacker to upload a JavaScript file containing a malicious script and reference it in an HTML file. When the HTML file is accessed, the malicious script is executed, potentially leading to the theft of sensitive information such as login credentials.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high CVSS base score of 9.8 indicates a critical vulnerability. The attack vector (AV:N) is network-based, requiring no user interaction (UI:N) and no privileges (PR:N). The complexity of the attack is low (AC:L), and the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Malicious File Upload: An attacker can upload a JavaScript file containing a malicious script.
2. HTML File Reference: The attacker references the malicious JavaScript file in an HTML file.
3. User Access: When a user accesses the HTML file, the malicious script is executed.

Exploitation Methods:

1. Phishing Campaigns: Attackers can embed the malicious HTML file in phishing emails or websites to lure users into accessing it.
2. Website Compromise: If the affected website is compromised, attackers can inject the malicious HTML file directly into the website's content.
3. Third-Party Integrations: If the affected software integrates with third-party services, attackers can exploit these integrations to inject the malicious script.

3. Affected Systems and Software Versions

Affected Software:

• usememos/memos version 0.9.1

Affected Systems:

• Any system running usememos/memos version 0.9.1, including web servers, cloud services, and local installations.

Fixed Version:

• The issue has been resolved in version 0.10.0.

4. Recommended Mitigation Strategies

1. Upgrade to the Latest Version:

   • Immediately upgrade to usememos/memos version 0.10.0 or later.

2. Input Validation and Sanitization:

   • Implement robust input validation and sanitization mechanisms to prevent the upload of malicious files.

3. Content Security Policy (CSP):

   • Enforce a strict Content Security Policy to restrict the execution of unauthorized scripts.

4. Regular Security Audits:

   • Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. User Education:

   • Educate users about the risks of accessing untrusted links and files.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations and individuals using the affected software. The potential for data theft, including sensitive information and login credentials, can lead to further security breaches and financial losses. The high severity of the vulnerability underscores the need for vigilant cybersecurity practices and timely patch management.

6. Technical Details for Security Professionals

Vulnerability Details:

• Type: Stored Cross-Site Scripting (XSS)
• CWE ID: CWE-79 (Improper Neutralization of Input During Web Page Generation)
• Exploitability: High
• Impact: High

References:

• NVD Entry
• GitHub Commit
• GitHub Repository
• Huntr Bounty
• Go Vulnerability Database

Aliases:

• CVE-2023-0109
• GHSA-5r2g-59px-3q9w

Assigner:

• @huntr_ai

ENISA IDs:

• Product: 6c986bbe-b915-3ad1-b8cc-9450fc9517a4 (usememos/memos, unspecified <0.10.0)
• Vendor: 983c9a97-25eb-3e49-a065-581785427c8e (usememos)

Conclusion

The stored XSS vulnerability in usememos/memos version 0.9.1 is critical and requires immediate attention. Organizations should prioritize upgrading to the fixed version and implementing additional security measures to mitigate the risk. The European cybersecurity landscape must remain vigilant against such vulnerabilities to protect sensitive data and maintain trust in digital services.