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CVE-2017-8490 : Détail

CVE-2017-8490

5
/
MEDIUM
A01-Broken Access Control
0.06%V3
Local
2017-06-14 23:00 +00:00
2017-08-11 13:57 +00:00
CVE.org
NVD

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Gestion des alertes

Descriptions

The kernel in Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an authenticated attacker to obtain information via a specially crafted application. aka "Windows Kernel Information Disclosure Vulnerability," a different vulnerability than CVE-2017-8492, CVE-2017-8491, CVE-2017-8489, CVE-2017-8488, CVE-2017-8485, CVE-2017-8483, CVE-2017-8482, CVE-2017-8480, CVE-2017-8479, CVE-2017-8478, CVE-2017-8476, CVE-2017-8474, CVE-2017-8469, CVE-2017-8462, CVE-2017-0300, CVE-2017-0299, and CVE-2017-0297.

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse 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

Metric Score Sévérité CVSS Vecteur Source
V3.0 5 MEDIUM CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:H/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.

Local

A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file.

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.

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

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.

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 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N [email protected]

EPSS

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

EPSS Score

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.

EPSS Percentile

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 : 42214

Date de publication : 2017-06-20 22:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1153 We have discovered that the win32k!NtGdiEnumFonts system call handler discloses very large portions of uninitialized pool memory to user-mode clients. The issue can be reproduced by running the attached proof-of-concept program on a system with the Special Pools mechanism enabled for win32k.sys. Then, it is clearly visible that a significant number of the bytes are equal to the markers inserted by Special Pools, and would otherwise contain leftover data that was previously stored in that memory region. In this case, the marker byte is 0x47 ("G"), and a dump of the initial 512 bytes of output is shown below. A full dump of the output can be found in the attached file. --- cut --- 00000000: e4 01 00 00 70 01 00 00 04 00 00 00 25 00 00 00 ....p.......%... 00000010: 12 00 00 00 00 00 00 00 00 00 00 00 90 01 00 00 ................ 00000020: 00 00 00 ee 03 02 01 31 43 00 6f 00 6e 00 73 00 .......1C.o.n.s. 00000030: 6f 00 6c 00 61 00 73 00 00 00 47 47 47 47 47 47 o.l.a.s...GGGGGG 00000040: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000050: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000060: 47 47 47 47 47 47 00 00 43 00 6f 00 6e 00 73 00 GGGGGG..C.o.n.s. 00000070: 6f 00 6c 00 61 00 73 00 00 00 47 47 47 47 47 47 o.l.a.s...GGGGGG 00000080: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000090: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 000000a0: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 000000b0: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 000000c0: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 000000d0: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 000000e0: 47 47 47 47 47 47 00 00 52 00 65 00 67 00 75 00 GGGGGG..R.e.g.u. 000000f0: 6c 00 61 00 72 00 00 00 47 47 47 47 47 47 47 47 l.a.r...GGGGGGGG 00000100: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000110: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000120: 47 47 47 47 47 47 00 00 43 00 65 00 6e 00 74 00 GGGGGG..C.e.n.t. 00000130: 72 00 61 00 6c 00 20 00 45 00 75 00 72 00 6f 00 r.a.l. .E.u.r.o. 00000140: 70 00 65 00 61 00 6e 00 00 00 47 47 47 47 47 47 p.e.a.n...GGGGGG 00000150: 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 47 GGGGGGGGGGGGGGGG 00000160: 47 47 47 47 47 47 47 47 64 76 00 08 00 00 00 00 GGGGGGGGdv...... 00000170: 47 47 47 47 00 ff 01 02 25 00 00 00 1d 00 00 00 GGGG....%....... 00000180: 08 00 00 00 05 00 00 00 00 00 00 00 11 00 00 00 ................ 00000190: 23 00 00 00 90 01 00 00 00 00 00 00 60 00 00 00 #...........`... 000001a0: 60 00 00 00 00 00 ff fe 01 00 02 00 00 00 00 36 `..............6 000001b0: ee 47 47 47 40 00 24 00 00 08 00 00 5e 09 00 00 .GGG@.$.....^... 000001c0: 66 04 00 00 ff 02 00 e1 ff fc 00 40 09 00 00 00 f..........@.... 000001d0: 00 00 00 00 9f 01 00 60 00 00 d7 df 61 6c 00 08 .......`....al.. 000001e0: 00 00 00 00 e4 01 00 00 70 01 00 00 04 00 00 00 ........p....... 000001f0: 25 00 00 00 12 00 00 00 00 00 00 00 00 00 00 00 %............... --- cut --- Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42214.zip

Products Mentioned

Configuraton 0

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version -

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version -

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_server_2016 >> Version -

References

https://www.exploit-db.com/exploits/42214/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/98867
Tags : vdb-entry, x_refsource_BID

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