CVE-2017-0087 : Detail

CVE-2017-0087

8.8
/
High
Overflow
9.8%V3
Network
2017-03-16
23h00 +00:00
2017-08-15
07h57 +00:00
CVE.org
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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-2017-0086, 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

 [email protected]
V2 9.3 AV:N/AC:M/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 : 42234

Publication date : 2017-06-22 22h00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1198 We have encountered a crash in the Windows Uniscribe user-mode library, in the memmove() function called by USP10!MergeLigRecords, while trying to display text using a corrupted font file: --- (4e0.6dc): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000001 ebx=00000036 ecx=000023af edx=00000003 esi=03624337 edi=0362436d eip=76e1026a esp=003cefd8 ebp=003cefe0 iopl=0 nv up ei pl nz ac pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010216 msvcrt!memmove+0x224: 76e1026a 8a4603 mov al,byte ptr [esi+3] ds:0023:0362433a=?? 0:000> kb # ChildEBP RetAddr Args to Child 00 003cefe0 774c772d 03621fc1 03621f8b 000023b0 msvcrt!memmove+0x224 01 003ceffc 774c75c3 03615fd0 036159d0 003cf098 USP10!MergeLigRecords+0x3d 02 003cf05c 774c7124 0000001a 035b3d88 035bffa8 USP10!LoadTTOArabicShapeTables+0x3f3 03 003cf070 774cc734 2e0105bd 035b3d88 035a6124 USP10!LoadArabicShapeTables+0xd4 04 003cf08c 774ba5a0 2e0105bd 036157d0 0000001a USP10!ArabicLoadTbl+0xd4 05 003cf0b4 774ba692 035a6124 2e0105bd 0000001a USP10!UpdateCache+0xb0 06 003cf0c8 774c15fd 2e0105bd 035a6000 774c16ab USP10!ScriptCheckCache+0x62 07 003cf0d4 774c16ab 00000001 00000001 00000000 USP10!GetShapeFunction+0xd 08 003cf10c 774c2bd4 00000001 00000004 003cf18c USP10!RenderItemNoFallback+0x5b 09 003cf138 774c2e62 00000001 00000004 003cf18c USP10!RenderItemWithFallback+0x104 0a 003cf15c 774c43f9 00000004 003cf18c 035a6124 USP10!RenderItem+0x22 0b 003cf1a0 774b7a04 000004a0 00000400 2e0105bd USP10!ScriptStringAnalyzeGlyphs+0x1e9 0c 003cf1b8 760a1736 2e0105bd 035a6040 0000000a USP10!ScriptStringAnalyse+0x284 0d 003cf204 760a18c1 2e0105bd 003cf688 0000000a LPK!LpkStringAnalyse+0xe5 0e 003cf300 760a17b4 2e0105bd 00000000 00000000 LPK!LpkCharsetDraw+0x332 0f 003cf334 77df56a9 2e0105bd 00000000 00000000 LPK!LpkDrawTextEx+0x40 10 003cf374 77df5a64 2e0105bd 00000048 00000000 USER32!DT_DrawStr+0x13c 11 003cf3c0 77df580f 2e0105bd 003cf688 003cf69c USER32!DT_GetLineBreak+0x78 12 003cf46c 77df5882 2e0105bd 00000000 0000000a USER32!DrawTextExWorker+0x250 13 003cf490 77df5b68 2e0105bd 003cf688 ffffffff USER32!DrawTextExW+0x1e 14 003cf4c4 000e6c3a 2e0105bd 003cf688 ffffffff USER32!DrawTextW+0x4d [...] 0:000> db poi(ebp+8) 03621fc1 c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fd1 c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fe1 c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621ff1 c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 d0 d0 d0 d0 ?? ...............? 03622001 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ???????????????? 03622011 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ???????????????? 03622021 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ???????????????? 03622031 ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? ???????????????? 0:000> db poi(ebp+c) 03621f8b 00 b5 00 b7 00 b9 00 bb-00 bd 00 bf 00 c3 00 c5 ................ 03621f9b 00 c9 00 cb 00 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fab c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fbb c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fcb c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621fdb c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621feb c0 c0 c0 c0 c0 c0 c0 c0-c0 c0 c0 c0 c0 c0 c0 c0 ................ 03621ffb c0 d0 d0 d0 d0 ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ?? .....??????????? 0:000> dd esi 03624337 ???????? ???????? ???????? ???????? 03624347 ???????? ???????? ???????? ???????? 03624357 ???????? ???????? ???????? ???????? 03624367 ???????? ???????? ???????? ???????? 03624377 ???????? ???????? ???????? ???????? 03624387 ???????? ???????? ???????? ???????? 03624397 ???????? ???????? ???????? ???????? 036243a7 ???????? ???????? ???????? ???????? 0:000> dd edi 0362436d ???????? ???????? ???????? ???????? 0362437d ???????? ???????? ???????? ???????? 0362438d ???????? ???????? ???????? ???????? 0362439d ???????? ???????? ???????? ???????? 036243ad ???????? ???????? ???????? ???????? 036243bd ???????? ???????? ???????? ???????? 036243cd ???????? ???????? ???????? ???????? 036243dd ???????? ???????? ???????? ???????? --- 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. It's worth noting that the crash is almost identical to the one reported in Issue #1026 , which was supposedly fixed as CVE-2017-0087 in the MS17-011 bulletin. The number of times we have encountered this crash while fuzzing the patched version of USP10.DLL might suggest that the fix was incomplete (or alternatively, that there is a separate bug which causes a crash in the same code location). Attached are 6 proof of concept malformed font files which trigger the crash. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42234.zip
Exploit Database EDB-ID : 41650

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=1026&desc=2 We have encountered a crash in the Windows Uniscribe user-mode library, in the memcpy() function called by USP10!MergeLigRecords, while trying to display text using a corrupted font file: --- (2bd0.637c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=0929a000 ebx=09299fa0 ecx=00000009 edx=00000002 esi=09299fda edi=092b7914 eip=76bc9b60 esp=0015f534 ebp=0015f53c iopl=0 nv up ei pl nz na po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010202 msvcrt!memcpy+0x5a: 76bc9b60 f3a5 rep movs dword ptr es:[edi],dword ptr [esi] 0:000> kb ChildEBP RetAddr Args to Child 0015f53c 751f777d 092b7914 09299fda 00000026 msvcrt!memcpy+0x5a 0015f554 751f74e9 0928ffd0 0928f9d0 0015f5f0 USP10!MergeLigRecords+0x14d 0015f5b4 751f7044 0000001a 09223d88 09233fa8 USP10!LoadTTOArabicShapeTables+0x3f9 0015f5c8 751fc5f4 a60118b0 09223d88 09216124 USP10!LoadArabicShapeTables+0xd4 0015f5e4 751ea5a0 a60118b0 0928f7d0 0000001a USP10!ArabicLoadTbl+0xd4 0015f608 751ea692 09216124 a60118b0 0000001a USP10!UpdateCache+0xb0 0015f61c 751f152d a60118b0 09216000 751f15db USP10!ScriptCheckCache+0x62 0015f628 751f15db 00000001 00000001 092162e8 USP10!GetShapeFunction+0xd 0015f660 751f2b14 00000001 00000000 0015f6e0 USP10!RenderItemNoFallback+0x5b 0015f68c 751f2da2 00000001 00000000 0015f6e0 USP10!RenderItemWithFallback+0x104 0015f6b0 751f4339 00000000 0015f6e0 09216124 USP10!RenderItem+0x22 0015f6f4 751e7a04 000004a0 00000400 a60118b0 USP10!ScriptStringAnalyzeGlyphs+0x1e9 0015f70c 76ca5465 a60118b0 09216040 0000000a USP10!ScriptStringAnalyse+0x284 0015f758 76ca5172 a60118b0 0015fb40 0000000a LPK!LpkStringAnalyse+0xe5 0015f854 76ca1410 a60118b0 00000000 00000000 LPK!LpkCharsetDraw+0x332 0015f888 763c18b0 a60118b0 00000000 00000000 LPK!LpkDrawTextEx+0x40 0015f8c8 763c22bf a60118b0 000000c0 00000000 USER32!DT_DrawStr+0x13c 0015f914 763c21f2 a60118b0 0015fb40 0015fb54 USER32!DT_GetLineBreak+0x78 0015f9c0 763c14d4 a60118b0 00000000 0000000a USER32!DrawTextExWorker+0x255 0015f9e4 763c2475 a60118b0 0015fb40 ffffffff USER32!DrawTextExW+0x1e 0015fa18 010e6a5c a60118b0 0015fb40 ffffffff USER32!DrawTextW+0x4d [...] 0:000> dd esi 09299fda 03e003df 03df03ea 03df0382 03df0384 09299fea 03df0388 03e0038e 03e00382 03e00384 09299ffa 03e00388 ???????? ???????? ???????? 0929a00a ???????? ???????? ???????? ???????? 0929a01a ???????? ???????? ???????? ???????? 0929a02a ???????? ???????? ???????? ???????? 0929a03a ???????? ???????? ???????? ???????? 0929a04a ???????? ???????? ???????? ???????? 0:000> dd edi 092b7914 ???????? ???????? ???????? ???????? 092b7924 ???????? ???????? ???????? ???????? 092b7934 ???????? ???????? ???????? ???????? 092b7944 ???????? ???????? ???????? ???????? 092b7954 ???????? ???????? ???????? ???????? 092b7964 ???????? ???????? ???????? ???????? 092b7974 ???????? ???????? ???????? ???????? 092b7984 ???????? ???????? ???????? ???????? --- 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 a proof of concept malformed font file which triggers the crash. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41650.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/41650/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securitytracker.com/id/1037992
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/96604
Tags : vdb-entry, x_refsource_BID