In some cases, browser prefetching (Chrome/Edge) can cause unintended redirects to the hangup page; disabling this feature in browser settings can resolve the issue for specific clients.
: Review /var/log/apm for unusual patterns of redirection to the hangup script, which might indicate a policy misconfiguration or an ongoing exploit attempt. vdesk hangupphp3 exploit
on Exploit-DB for technical details on input sanitization failures. Consult the F5 BIG-IP Security Cheatsheet In some cases, browser prefetching (Chrome/Edge) can cause
Here is the python code which exploits it Consult the F5 BIG-IP Security Cheatsheet Here is
The "Hangup" Ghost: Decoding the Ubiquitous /vdesk/hangup.php3
if (!isset($_SESSION['authenticated']) || $_SESSION['authenticated'] !== true) header('HTTP/1.0 403 Forbidden'); exit();
| Impact Area | Description | |-------------|-------------| | | Full control over the web server, allowing malware upload, data exfiltration, or pivoting to internal networks. | | Denial of Service | The race condition can corrupt session files for all users, effectively locking out entire helpdesk teams. | | Call Recording Theft | Attackers can download unencrypted call recordings stored by vDesk. | | Privilege Escalation | From a low-privileged agent account to the web server user, then potentially root via local exploits. | | VoIP Fraud | Using the compromised session, attackers can initiate outbound calls through the PBX integration. |