Apache mod_proxy HTML Injection / Partial XSS

Description

A restricted cross-site scripting vulnerability was reported in Apache HTTP Server 2.4.0-2.4.39, affecting the mod proxy error page. An attacker might make the link on the error page faulty, causing it to redirect to a URL of their choosing. This would only be exploitable if a server was set up with proxying enabled but the Proxy Error page was displayed due to a configuration error.

Recommendation

• Update Apache to the latest version

• Correctly configure the Proxy settings

Written by

Sooraj V Nair

Cyber Security Engineer

Sooraj was probably the kid who opened up a remote control just to see what was inside, then had to figure out how to put it back together before anyone noticed. That curiosity eventually found its way into cybersecurity, where breaking things is actually part of the job description. Today, he explores vulnerabilities, analysis threats, and helps build safer digital spaces. His favourite question remains the same: “What happens if I try this?”