CVE-2017-3169 : Exploit Details and Defense Strategies

Apache HTTP Server versions 2.2.x and 2.4.x are affected by a vulnerability that could lead to a NULL pointer dereference in mod_ssl when an HTTP request is made to an HTTPS port.

Understanding CVE-2017-3169

This CVE entry pertains to a specific vulnerability in Apache HTTP Server versions 2.2.x and 2.4.x that could result in a denial of service.

What is CVE-2017-3169?

CVE-2017-3169 is a vulnerability in Apache HTTP Server versions 2.2.x and 2.4.x that allows for a NULL pointer dereference in mod_ssl when certain conditions are met.

The Impact of CVE-2017-3169

The vulnerability in Apache HTTP Server could be exploited to cause a denial of service condition, potentially disrupting the server's functionality.

Technical Details of CVE-2017-3169

Apache HTTP Server versions 2.2.x and 2.4.x are susceptible to a NULL pointer dereference vulnerability in mod_ssl.

Vulnerability Description

The issue arises when third-party modules invoke ap_hook_process_connection() during an HTTP request to an HTTPS port, leading to a NULL pointer dereference.

Affected Systems and Versions

Product: Apache HTTP Server
Vendor: Apache Software Foundation
Affected Versions: 2.2.0 to 2.2.32, 2.4.0 to 2.4.25

Exploitation Mechanism

By making an HTTP request to an HTTPS port, attackers can trigger the NULL pointer dereference in mod_ssl, potentially causing a denial of service.

Mitigation and Prevention

Taking immediate steps to address the CVE-2017-3169 vulnerability is crucial to maintaining system security.

Immediate Steps to Take

Apply patches provided by the vendor to mitigate the vulnerability.
Monitor vendor advisories and security sources for updates and additional guidance.

Long-Term Security Practices

Regularly update and patch Apache HTTP Server to prevent known vulnerabilities.
Implement network security measures to detect and block malicious HTTP requests.

Patching and Updates

Stay informed about security updates and patches released by Apache Software Foundation.
Test patches in a controlled environment before applying them to production systems.