CVE-2017-15710 : What You Need to Know

Apache HTTP Server versions 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29 are affected by a vulnerability in the mod_authnz_ldap module that can lead to an out-of-bounds write in certain scenarios.

Understanding CVE-2017-15710

This CVE involves a specific vulnerability in the Apache HTTP Server that can potentially result in a Denial of Service attack.

What is CVE-2017-15710?

In Apache HTTP Server versions mentioned, a flaw in the mod_authnz_ldap module can trigger an out-of-bounds write when processing Accept-Language header values, potentially leading to a process crash or a DoS attack.

The Impact of CVE-2017-15710

The vulnerability can result in a process crash or a DoS attack, although the latter is less likely. The issue arises from improper handling of Accept-Language header values.

Technical Details of CVE-2017-15710

Apache HTTP Server's mod_authnz_ldap module is at the core of this vulnerability.

Vulnerability Description

The issue occurs when the module uses the Accept-Language header value for character encoding verification.
If the header value is too small, it can trigger an out-of-bounds write, potentially leading to a process crash.

Affected Systems and Versions

Apache HTTP Server versions 2.0.23 to 2.0.65
Apache HTTP Server versions 2.2.0 to 2.2.34
Apache HTTP Server versions 2.4.0 to 2.4.29

Exploitation Mechanism

The vulnerability is exploited by providing a small Accept-Language header value, causing an out-of-bounds write in memory.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Update Apache HTTP Server to a patched version that addresses the vulnerability.
Monitor for any unusual activity that could indicate an exploit attempt.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement network security measures to detect and prevent potential attacks.

Patching and Updates

Stay informed about security updates and patches released by Apache Software Foundation.
Apply patches promptly to ensure the security of Apache HTTP Server.