While the name "vdesk hangupphp3 exploit" is not an official CVE designation, it almost certainly refers to the critical in LIVEBOX Collaboration vDesk. This flaw, combined with other severe bugs like broken access control and 2FA bypasses, creates a perfect storm for attackers.
During the race, both processes try to call session_start() simultaneously. PHP’s default file-based session handler is not atomic. One process obtains a write lock, but the other executes session_write_close() prematurely. The session file becomes corrupted, containing partially unserialized data.
This specific endpoint, /vdesk/hangup.php3 , is part of the "vDesk" suite—the virtual desktop and session management interface used by F5 to handle user logins, session state, and logouts. In early versions of these systems, this file and related admin controllers were susceptible to several web-based attacks, including Cross-Site Request Forgery (CSRF) and Cross-Site Scripting (XSS). Understanding the /vdesk/hangup.php3 Endpoint vdesk hangupphp3 exploit
This technique, which leveraged the eval(name) JavaScript function suggested by researcher , allowed the attacker to load a remote script ( http://www.evil.foo/b ) from a third-party domain into the security context of the vulnerable FirePass site.
: The compromised web server can be used as a launching pad to attack other internal systems within the local network. While the name "vdesk hangupphp3 exploit" is not
| 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. |
Ensure the client's Host header matches the configured APM Virtual Server. PHP’s default file-based session handler is not atomic
The CVE entry for CVE-2007-0186 notes a potential overlap with . This earlier CVE likely described similar XSS issues in earlier builds of the FirePass firmware, suggesting that the vulnerabilities had persisted across multiple versions and patches.
To exploit this vulnerability, an attacker would typically send a crafted HTTP request to the vulnerable server, containing the malicious PHP code. The code would then be executed, granting the attacker access to the server.
The script accepts user-supplied inputs—such as session IDs, terminal names, or user parameters—and passes them directly into system-level execution functions (like eval() , exec() , passthru() , or system() ) without rigorous sanitization or filtering.
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