![]() ![]() ![]() This issue was discovered by Insyde engineering based on the general description provided by Intel's iSTARE group. The SMM code code attempts to sanitize pointers to ensure all pointers refer to the working buffer, but when a pointer is not found in the list of pointers to sanitize, the current action is not aborted, leading to undefined behavior. The buffer can be corrupted by DMA transfers. The code which uses can be inside of SMM, making the working buffer untrusted input. You can always check the version string of a driver on Windows by looking at the About tab of the driver’s Setup dialog. On the Version tab, click File Version in the Other version information list box. ![]() In UsbCoreDxe, tampering with the contents of the USB working buffer using DMA while certain USB transactions are in process leads to a TOCTOU problem that could be used by an attacker to cause SMRAM corruption and escalation of privileges The UsbCoreDxe module creates a working buffer for USB transactions outside of SMRAM. Right-click the driver DLL and select Properties. ![]()
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