This allows the exploit process to interact with higher privileged processes running as SYSTEM and execute code in their security context. We can take advantage of this condition to modify the SEP_TOKEN_PRIVILEGES structure of the Token object belonging to the exploit process and grant SE_DEBUG_NAME privilege. So, we can supply a pointer for the output buffer to a kernel address space address, and the error code will be written there.
#Sophos ssl vpn client 2.1 setup.exe driver
So, even though the driver checks for input/output buffer sizes, it doesn't validate if the pointers to those buffers are actually valid. Also, note that all the aforementioned IOCTLs use transfer type METHOD_NEITHER, which means that the I/O manager does not validate any of the supplied pointers and buffer sizes.
When some conditions in the user-controlled input buffer are not met, the driver writes an error code (0x2000001A) to a user-controlled address.
0 kommentar(er)
