Race condition in DefenseWall Personal Firewall 3.00 on Windows XP allows local users to bypass kernel-mode hook handlers, and execute dangerous code that would otherwise be blocked by a handler but not blocked by signature-based malware detection, via certain user-space memory changes during hook-handler execution, aka an argument-switch attack or a KHOBE attack. NOTE: this issue is disputed by some third parties because it is a flaw in a protection mechanism for situations where a crafted program has already begun to execute

The dwall.sys driver in SoftSphere DefenseWall Personal Firewall 3.24 allows local users to write data to arbitrary memory locations, and consequently gain privileges, via a crafted 0x00222000, 0x00222004, 0x00222008, 0x0022200c, or 0x00222010 IOCTL call.