Update README.md

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xerox 4 years ago
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# badeye # badeye
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
is not something you can inject from usermode, lsass.exe is (although it can be protected, depends on your system/hvci).
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
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
rather they use the handle to get the EPROCESS of the process that the handle is opened on.
<img src="https://imgur.com/5MjFoHg.png"/> <img src="https://imgur.com/5MjFoHg.png"/>
As you can see you can open any handle with any access and then pass it along to bedaisy and it will read/write for you...
# lsass.exe/csrss.exe # lsass.exe/csrss.exe

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