CVE-2017-0086 : Detail

CVE-2017-0086

8.8
/
High
Overflow
9.8%V3
Network
2017-03-16
23h00 +00:00
2017-08-15
07h57 +00:00
CVE.org
NVD
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CVE Descriptions

Uniscribe in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 allows remote attackers to execute arbitrary code via a crafted web site, aka "Uniscribe Remote Code Execution Vulnerability." This vulnerability is different from those described in CVE-2017-0072, CVE-2017-0083, CVE-2017-0084, CVE-2017-0087, CVE-2017-0088, CVE-2017-0089, and CVE-2017-0090.

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 8.8 HIGH CVSS:3.0/AV:N/AC:L/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.

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.

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

 nvd@nist.gov
V2 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C nvd@nist.gov

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 : 41649

Publication date : 2017-03-19 23h00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1025 We have encountered a crash in the Windows Uniscribe user-mode library, in the memset() function called by USP10!otlCacheManager::GlyphsSubstituted, while trying to display text using a corrupted font file: --- (449c.6338): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=092ac250 ebx=092ac230 ecx=00000784 edx=00000074 esi=0028ea6c edi=092affd0 eip=76bc9c8d esp=0028e978 ebp=0028e97c iopl=0 nv up ei pl nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206 msvcrt!_VEC_memcpy+0x116: 76bc9c8d 660f7f4730 movdqa xmmword ptr [edi+30h],xmm0 ds:002b:092b0000=???????????????????????????????? 0:000> kb ChildEBP RetAddr Args to Child 0028e97c 76bc9c39 092ac250 0003ff80 00000006 msvcrt!_VEC_memcpy+0x116 0028e99c 76bc9cde 092ac250 00000000 0003fff4 msvcrt!_VEC_memzero+0x36 0028e9c0 75234b58 092ac248 00000000 0003fffc msvcrt!_VEC_memzero+0x82 0028e9e0 752336a1 0028ed18 00000006 0000ffff USP10!otlCacheManager::GlyphsSubstituted+0xc8 0028ebc0 7522f29f 42555347 0028ed58 0028ece4 USP10!ApplyFeatures+0x541 0028ec0c 7522b083 00000000 092c6ffc 092c6e18 USP10!SubstituteOtlGlyphs+0x1bf 0028ec38 75223921 0028ecb4 0028ed0c 0028ed58 USP10!ShapingLibraryInternal::SubstituteOtlGlyphsWithLanguageFallback+0x23 0028eed0 7521548a 0028efdc 0028f008 0028eff0 USP10!ArabicEngineGetGlyphs+0x891 0028ef90 7521253f 0028efdc 0028f008 0028eff0 USP10!ShapingGetGlyphs+0x36a 0028f078 751e5c6f 2a0123f2 092a6124 092a6318 USP10!ShlShape+0x2ef 0028f0bc 751f167a 2a0123f2 092a6124 092a6318 USP10!ScriptShape+0x15f 0028f11c 751f2b14 00000000 00000000 0028f19c USP10!RenderItemNoFallback+0xfa 0028f148 751f2da2 00000000 00000000 0028f19c USP10!RenderItemWithFallback+0x104 0028f16c 751f4339 00000000 0028f19c 092a6124 USP10!RenderItem+0x22 0028f1b0 751e7a04 000004a0 00000400 2a0123f2 USP10!ScriptStringAnalyzeGlyphs+0x1e9 0028f1c8 76ca5465 2a0123f2 092a6040 0000000a USP10!ScriptStringAnalyse+0x284 0028f214 76ca5172 2a0123f2 0028f5fc 0000000a LPK!LpkStringAnalyse+0xe5 0028f310 76ca1410 2a0123f2 00000000 00000000 LPK!LpkCharsetDraw+0x332 0028f344 763c18b0 2a0123f2 00000000 00000000 LPK!LpkDrawTextEx+0x40 0028f384 763c22bf 2a0123f2 00000070 00000000 USER32!DT_DrawStr+0x13c 0028f3d0 763c21f2 2a0123f2 0028f5fc 0028f610 USER32!DT_GetLineBreak+0x78 0028f47c 763c14d4 2a0123f2 00000000 0000000a USER32!DrawTextExWorker+0x255 0028f4a0 763c2475 2a0123f2 0028f5fc ffffffff USER32!DrawTextExW+0x1e 0028f4d4 01336a5c 2a0123f2 0028f5fc ffffffff USER32!DrawTextW+0x4d [...] 0:000> dd edi 092affd0 00000000 00000000 00000000 00000000 092affe0 00000000 00000000 00000000 00000000 092afff0 00000000 00000000 00000000 00000000 092b0000 ???????? ???????? ???????? ???????? 092b0010 ???????? ???????? ???????? ???????? 092b0020 ???????? ???????? ???????? ???????? 092b0030 ???????? ???????? ???????? ???????? 092b0040 ???????? ???????? ???????? ???????? --- The issue reproduces on Windows 7. It is easiest to reproduce with PageHeap enabled, but it is also possible to observe a crash in a default system configuration. In order to reproduce the problem with the provided samples, it might be necessary to use a custom program which displays all of the font's glyphs at various point sizes. Attached is an archive with 2 crashing samples. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41649.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

https://www.exploit-db.com/exploits/41649/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securityfocus.com/bid/96603
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1037992
Tags : vdb-entry, x_refsource_SECTRACK