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CVE-2017-0112 : Détail

CVE-2017-0112

4.3
/
MEDIUM
A01-Broken Access Control
0.69%V3
Network
2017-03-16 23:00 +00:00
2017-08-15 07:57 +00:00
CVE.org
NVD

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Descriptions

Uniscribe in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to obtain sensitive information from process memory via a crafted web site, aka "Uniscribe Information Disclosure Vulnerability." CVE-2017-0085, CVE-2017-0091, CVE-2017-0092, CVE-2017-0111, CVE-2017-0113, CVE-2017-0114, CVE-2017-0115, CVE-2017-0116, CVE-2017-0117, CVE-2017-0118, CVE-2017-0119, CVE-2017-0120, CVE-2017-0121, CVE-2017-0122, CVE-2017-0123, CVE-2017-0124, CVE-2017-0125, CVE-2017-0126, CVE-2017-0127, and CVE-2017-0128.

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 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 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 : 41655

Date de publication : 2017-03-19 23:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1031 Through fuzzing, we have discovered a number of different crashes in the Windows Uniscribe user-mode library, while trying to display text using a corrupted font file or calling documented Uniscribe API functions against such malformed fonts. In this bug, we address a variety of crashes manifested through invalid memory READ accesses. Some of them occur at page boundaries, while other at seemingly valid yet non-mapped addresses. The sheer amount of the crashes makes it very difficult for us to assess the root cause, severity and impact of each of them within a reasonable time-frame. Consequently, we have only performed basic deduplication based on the top-level address of the faulting instruction, and are reporting all of such crashes in this single bug tracker entry. A summary of the crash locations is as follows: -------------------------------------------------------------- 1 USP10!otlMultiSubstLookup::apply+0xa8 2 USP10!otlSingleSubstLookup::applyToSingleGlyph+0x98 3 USP10!otlSingleSubstLookup::apply+0xa9 4 USP10!otlMultiSubstLookup::getCoverageTable+0x2c 5 USP10!otlMark2Array::mark2Anchor+0x18 6 USP10!GetSubstGlyph+0x2e 7 USP10!BuildTableCache+0x1ca 8 USP10!otlMkMkPosLookup::apply+0x1b4 9 USP10!otlLookupTable::markFilteringSet+0x1a 10 USP10!otlSinglePosLookup::getCoverageTable+0x12 11 USP10!BuildTableCache+0x1e7 12 USP10!otlChainingLookup::getCoverageTable+0x15 13 USP10!otlReverseChainingLookup::getCoverageTable+0x15 14 USP10!otlLigCaretListTable::coverage+0x7 15 USP10!otlMultiSubstLookup::apply+0x99 16 USP10!otlTableCacheData::FindLookupList+0x9 17 USP10!ttoGetTableData+0x4b4 18 USP10!GetSubtableCoverage+0x1ab 19 USP10!otlChainingLookup::apply+0x2d 20 USP10!MergeLigRecords+0x132 21 USP10!otlLookupTable::subTable+0x23 22 USP10!GetMaxParameter+0x53 23 USP10!ApplyLookup+0xc3 24 USP10!ApplyLookupToSingleGlyph+0x6f 25 USP10!ttoGetTableData+0x19f6 26 USP10!otlExtensionLookup::extensionSubTable+0x1d 27 USP10!ttoGetTableData+0x1a77 -------------------------------------------------------------- All of the issues reproduce successfully on Windows 7. It is highly encouraged to enable PageHeap for the test program in order to get reliable repros. It is also necessary to use a custom program which displays all of the font's glyphs at various point sizes, and additionally calls some of the Uniscribe-specific API functions. Attached is an archive with textual crash excerpts and up to 3 samples per each unique crash. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41655.zip

Products Mentioned

Configuraton 0

Microsoft>>Windows_7 >> Version *

Microsoft>>Windows_server_2008 >> Version *

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_vista >> Version *

References

http://www.securitytracker.com/id/1037992
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/96659
Tags : vdb-entry, x_refsource_BID
https://www.exploit-db.com/exploits/41655/
Tags : exploit, x_refsource_EXPLOIT-DB

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