Sunbelt Kerio Personal Firewall hooks many functions in SSDT and in at least six cases it fails to validate arguments that come from user mode. User calls to NtCreateFile, NtDeleteFile, NtLoadDriver, NtMapViewOfSection, NtOpenFile, NtSetInformationFile with invalid argument values can cause system crashes because of errors in Kerio drivers fwdrv.sys and khips.sys. Further impacts of this bug (like arbitrary code execution in the kernel mode) were not examined.
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