Agnitum Outpost Firewall PRO 4.0 allows local users to bypass access restrictions and insert Trojan horse drivers into the product's installation directory by creating links using FileLinkInformation requests with the ZwSetInformationFile function, as demonstrated by modifying SandBox.sys.

The Sandbox.sys driver in Outpost Firewall PRO 4.0, and possibly earlier versions, does not validate arguments to hooked SSDT functions, which allows local users to cause a denial of service (crash) via invalid arguments to the (1) NtAssignProcessToJobObject,, (2) NtCreateKey, (3) NtCreateThread, (4) NtDeleteFile, (5) NtLoadDriver, (6) NtOpenProcess, (7) NtProtectVirtualMemory, (8) NtReplaceKey, (9) NtTerminateProcess, (10) NtTerminateThread, (11) NtUnloadDriver, and (12) NtWriteVirtualMemory functions.

The \Device\SandBox driver in Outpost Firewall PRO 4.0 (964.582.059) allows local users to cause a denial of service (system crash) via an invalid argument to the DeviceIoControl function that triggers an invalid memory operation.

Unrestricted critical resource lock in Agnitum Outpost Firewall PRO 4.0 1007.591.145 and earlier allows local users to cause a denial of service (system hang) by capturing the outpostipchdr mutex.