---------------------------------------- Synopsis ---------------------------------------- WinGate is vulnerable to denial-of-service (DoS) attacks caused probably by a resource exhaustion vulnerability. The IMAP server ceases to provide access to its clients after processing a LIST command with a large parameter (see details bellow). Product: WinGate Version: 6.2.2 and probably the older versions Vendor: Qbik (www.wingate.com) Type: Denial-of-service Risk: service disruption Remote: Yes Discovered by: Jo?o Antunes (AJECT -- Attack Injection Tool) on 14/May/ 2008 Exploit: Not Available Solution: Not Available Status: Developers were contacted several times since the vulnerability was discovered. ---------------------------------------- Vulnerability Description ---------------------------------------- The vulnerability can be triggered by sending the following messages to the imap server: A01 LOGIN <user> <password> A02 LIST Ax1000 * Depending on the server's resources, it may be required to repeat the above exploit to deplete its resources. (in a 512MB RAM configuration, the exploit was executed twice) The above exploit caused the server to reject all subsequent connections with a "NO access denied" reply thus resulting in a remote denial of service.