GHSA-4m6c-649p-f6gf

Описание

Summary

The serendipity_setCookie() function uses $_SERVER['HTTP_HOST'] without validation as the domain parameter of setcookie(). An attacker can force authentication cookies — including session tokens and auto-login tokens — to be scoped to an attacker-controlled domain, facilitating session hijacking.

Details

In include/functions_config.inc.php:726:

This function is called during login with sensitive cookies:

If an attacker can influence the Host header at login time (e.g. via MITM, reverse proxy misconfiguration, or load balancer), authentication cookies are issued scoped to the attacker's domain instead of the legitimate one.

PoC

Expected output:

Impact

• Session fixation — attacker pre-sets a cookie scoped to their domain, then tricks the victim into authenticating, inheriting the poisoned token
• Token leakage — author_autologintoken scoped to wrong domain may be sent to attacker-controlled infrastructure
• Privilege escalation — if admin logs in under a poisoned Host header, their admin token is compromised

Suggested Fix

Validate HTTP_HOST against the configured $serendipity['url'] before use: