The (a) NAVENG (NAVENG.SYS) and (b) NAVEX15 (NAVEX15.SYS) device drivers 20061.3.0.12 and later, as used in Symantec AntiVirus and security products, allow local users to gain privileges by overwriting critical system addresses using a crafted Irp to the IOCTL functions (1) 0x222AD3, (2) 0x222AD7, and (3) 0x222ADB.