EUVD-2024-0720

Comprehensive Technical Analysis of EUVD-2024-0720

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2024-0720 pertains to an "Unrestricted Upload of File with Dangerous Type" in Apache Answer, affecting versions up to 1.2.1. This issue allows a logged-in user to upload large pixel files, leading to a Pixel Flood Attack that can exhaust server memory and cause a denial of service (DoS).

Severity Evaluation:

• CVSS Base Score: 9.1 (Critical)
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

The high base score indicates a critical vulnerability due to its low attack complexity (AC:L), lack of required user interaction (UI:N), and significant impact on integrity (I:H) and availability (A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

1. Logged-in User Upload: An authenticated user can upload a maliciously large pixel file during content posting.
2. Automated Scripts: Attackers could use automated scripts to repeatedly upload large files, exacerbating the memory exhaustion.

Exploitation Methods:

1. Memory Exhaustion: By uploading large pixel files, an attacker can consume all available server memory, leading to a DoS condition.
2. Resource Starvation: Continuous uploads can starve the server of resources, affecting other legitimate users and services.

3. Affected Systems and Software Versions

Affected Software:

• Apache Answer versions up to and including 1.2.1.

Systems:

• Any server running the affected versions of Apache Answer.
• Systems where users have the capability to upload files, particularly images.

4. Recommended Mitigation Strategies

1. Upgrade to Version 1.2.5: The primary mitigation is to upgrade to Apache Answer version 1.2.5, which includes a fix for this vulnerability.
2. Implement File Upload Restrictions: Limit the size and type of files that can be uploaded to prevent large pixel files from being processed.
3. Monitor Server Resources: Implement monitoring to detect unusual spikes in memory usage and take corrective actions.
4. Rate Limiting: Apply rate limiting on file uploads to prevent automated scripts from overwhelming the server.
5. User Education: Educate users about the risks of uploading large files and encourage responsible usage.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using Apache Answer within the European Union. Given the critical nature of the vulnerability, it could lead to widespread service disruptions and potential data breaches if exploited. The European cybersecurity landscape must prioritize patching and upgrading affected systems to mitigate this risk.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2024-22393
• GHSA ID: GHSA-rmqp-mvv2-54c6
• Affected Product: Apache Answer
• Affected Versions: 0 ≤ 1.2.1
• Vendor: Apache Software Foundation

References:

• NVD Detail
• GitHub Repository
• Apache Mailing List
• Openwall Security List

EPSS Score: 9 (indicating a high likelihood of exploitation in the wild)

ENISA IDs:

• Product IDs: 8b1b649f-bed5-380a-a952-f31ea40b79bf, 9d7b7197-dc03-3437-b1d6-5feabe3153a7
• Vendor ID: 6a4e8957-094b-363a-8943-a46111c9f7c4

Conclusion: This vulnerability underscores the importance of regular software updates and robust file upload policies. Organizations should prioritize upgrading to the patched version and implementing additional security measures to safeguard against similar attacks. The European cybersecurity community must remain vigilant and proactive in addressing such critical vulnerabilities to maintain the integrity and availability of digital services.