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8 lines
767 B
8 lines
767 B
# badeye
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Its well known that battleye proxies calls to `NtReadVirtualMemory/NtWriteVirtualMemory` to their driver via DeviceIoControl in both `lsass.exe` and `csrss.exe`. Although csrss.exe
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is not something you can inject from usermode, lsass.exe is (although it can be protected, depends on your system/hvci).
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The reason this proxy of a syscall is a vulnerability is simply because their is no validation of R/W access on the specified handle passed to `BEDaisy`. In other words: you can
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open a handle with `PROCESS_QUERY_LIMITED_INFORMATION` and use that handle to read/write any usermode memory that is also read/writeable. The handle access is not important to bedaisy
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rather they use the handle to get the EPROCESS of the process that the handle is opened on. |