EUVD-2024-37357

Comprehensive Technical Analysis of EUVD-2024-37357

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified in EUVD-2024-37357 affects the core of Apache HTTP Server versions 2.4.59 and earlier. This vulnerability can lead to information disclosure, Server-Side Request Forgery (SSRF), or local script execution through malicious or exploitable response headers from backend applications. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical risk.

CVSS Vector Breakdown:

• AV:N (Network Vector): The vulnerability can be exploited remotely over the network.
• AC:L (Low Complexity): The attack requires low skill or resources to exploit.
• PR:N (No Privileges Required): No authentication is required to exploit the vulnerability.
• UI:N (No User Interaction): No user interaction is required for the exploit to succeed.
• S:U (Unchanged): The scope of the vulnerability does not change.
• C:H (High Confidentiality Impact): Complete loss of confidentiality.
• I:H (High Integrity Impact): Complete loss of integrity.
• A:H (High Availability Impact): Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

Information Disclosure:

• Attackers can manipulate response headers to disclose sensitive information, such as internal IP addresses, server configurations, or other confidential data.

Server-Side Request Forgery (SSRF):

• By crafting malicious response headers, attackers can trick the server into making unauthorized requests to internal or external services, potentially leading to data exfiltration or unauthorized access.

Local Script Execution:

• Exploitable response headers can be used to execute arbitrary scripts on the server, leading to complete control over the affected system.

3. Affected Systems and Software Versions

The vulnerability affects Apache HTTP Server versions from 2.4.0 to 2.4.59. All systems running these versions are at risk and should be updated immediately.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Users are strongly recommended to upgrade to Apache HTTP Server version 2.4.60, which includes the fix for this vulnerability.

Temporary Mitigation:

• Network Segmentation: Isolate affected servers from critical internal networks to limit the potential impact of SSRF attacks.
• Firewall Rules: Implement strict firewall rules to restrict outbound traffic from the affected servers.
• Monitoring: Increase monitoring and logging of network traffic to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

Given the widespread use of Apache HTTP Server in various industries, including government, finance, and healthcare, this vulnerability poses a significant risk to the European cybersecurity landscape. Organizations that fail to patch their systems promptly could face severe consequences, including data breaches, service disruptions, and potential legal ramifications under GDPR.

6. Technical Details for Security Professionals

Exploit Details:

• The vulnerability is triggered by malicious or exploitable response headers from backend applications. These headers can be crafted to exploit the server's handling of HTTP requests, leading to information disclosure, SSRF, or local script execution.

Detection:

• Log Analysis: Review server logs for unusual or unauthorized requests, especially those involving internal IP addresses or sensitive data.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activities that may indicate an exploit attempt.

Response:

• Incident Response Plan: Ensure that an incident response plan is in place to quickly address any detected exploits.
• Patch Management: Implement a robust patch management process to ensure timely updates and patches for all critical systems.

References:

• Apache HTTP Server Security Advisory
• NetApp Security Advisory

Aliases:

• CVE-2024-38476

EPSS Score:

• The EPSS score of 5 indicates a moderate likelihood of exploitation in the wild.

ENISA IDs:

• Product: Apache HTTP Server (2.4.0 ≤2.4.59)
• Vendor: Apache Software Foundation

By following these recommendations and maintaining vigilant monitoring, organizations can significantly reduce the risk posed by this vulnerability.