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CVE-2016-3209 : Detail

CVE-2016-3209

5.5
/
MEDIUM
A01-Broken Access Control
1.64%V3
Local
2016-10-13 23:00 +00:00
2018-10-12 17:57 +00:00
CVE.org
NVD

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Descriptions

Graphics Device Interface (aka GDI or GDI+) in Microsoft Windows Vista SP2; 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, and 1607; Office 2007 SP3; Office 2010 SP2; Word Viewer; Skype for Business 2016; Lync 2013 SP1; Lync 2010; Lync 2010 Attendee; Live Meeting 2007 Console; .NET Framework 3.0 SP2, 3.5, 3.5.1, 4.5.2, and 4.6; and Silverlight 5 allows remote attackers to bypass the ASLR protection mechanism via unspecified vectors, aka "True Type Font Parsing Information Disclosure Vulnerability."

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

Metric Score Severity CVSS Vector Source
V3.0 5.5 MEDIUM CVSS:3.0/AV:L/AC:L/PR:N/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.

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.

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

 nvd@nist.gov
V2 5 AV:N/AC:L/Au:N/C:P/I:N/A:N 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 : 40598

Publication date : 2016-10-19 22:00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=864 We have encountered a number of Windows kernel crashes in the win32k!itrp_GetCVTEntryFast function (called by the handler of the RCVT TrueType instruction) while processing corrupted TTF font files, such as: --- PAGE_FAULT_IN_NONPAGED_AREA (50) Invalid system memory was referenced. This cannot be protected by try-except, it must be protected by a Probe. Typically the address is just plain bad or it is pointing at freed memory. Arguments: Arg1: fb000078, memory referenced. Arg2: 00000000, value 0 = read operation, 1 = write operation. Arg3: 8ee70ccb, If non-zero, the instruction address which referenced the bad memory address. Arg4: 00000000, (reserved) Debugging Details: ------------------ READ_ADDRESS: fb000078 Paged session pool FAULTING_IP: win32k!itrp_GetCVTEntryFast+8 8ee70ccb 8b048a mov eax,dword ptr [edx+ecx*4] MM_INTERNAL_CODE: 0 IMAGE_NAME: win32k.sys DEBUG_FLR_IMAGE_TIMESTAMP: 57349934 MODULE_NAME: win32k FAULTING_MODULE: 8ee20000 win32k DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT BUGCHECK_STR: 0x50 PROCESS_NAME: csrss.exe CURRENT_IRQL: 2 ANALYSIS_VERSION: 6.3.9600.17237 (debuggers(dbg).140716-0327) x86fre TRAP_FRAME: 897b3568 -- (.trap 0xffffffff897b3568) ErrCode = 00000000 eax=fafffcdc ebx=00000000 ecx=000000ff edx=fafffc7c esi=fafffe6e edi=00000000 eip=8ee70ccb esp=897b35dc ebp=897b3620 iopl=0 nv up ei pl nz na pe nc cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00010206 win32k!itrp_GetCVTEntryFast+0x8: 8ee70ccb 8b048a mov eax,dword ptr [edx+ecx*4] ds:0023:fb000078=???????? Resetting default scope LAST_CONTROL_TRANSFER: from 828edd87 to 82889978 STACK_TEXT: 897b30bc 828edd87 00000003 7170889f 00000065 nt!RtlpBreakWithStatusInstruction 897b310c 828ee885 00000003 00000000 00000000 nt!KiBugCheckDebugBreak+0x1c 897b34d0 8289c94d 00000050 fb000078 00000000 nt!KeBugCheck2+0x68b 897b3550 8284efa8 00000000 fb000078 00000000 nt!MmAccessFault+0x104 897b3550 8ee70ccb 00000000 fb000078 00000000 nt!KiTrap0E+0xdc 897b35d8 8ee83782 fafffe7b 8ee7bf89 00000001 win32k!itrp_GetCVTEntryFast+0x8 897b35e0 8ee7bf89 00000001 8ee81af3 00000000 win32k!itrp_RCVT+0x63 897b35e8 8ee81af3 00000000 fafffcdc faffff10 win32k!itrp_InnerExecute+0x38 897b3620 8ee7bf89 fafffcdc 8ee7f3b1 fafffd70 win32k!itrp_CALL+0x23b 897b3628 8ee7f3b1 fafffd70 fafffd38 faffff90 win32k!itrp_InnerExecute+0x38 897b36a8 8ee7cee8 fafffec8 faffff10 fafffcdc win32k!itrp_Execute+0x2b2 897b36dc 8ee85d0d fafffcdc 00000000 fa44a298 win32k!itrp_ExecutePrePgm+0x5d 897b36f8 8ee7f67c fa44a51c fafffc7c fa44a2c4 win32k!fsg_RunPreProgram+0x78 897b3758 8ee89385 00000001 897b3774 8ee892dc win32k!fs__Contour+0x1c1 897b3764 8ee892dc fa44a010 fa44a07c 897b3790 win32k!fs_ContourGridFit+0x12 897b3774 8ee89c38 fa44a010 fa44a07c 00000003 win32k!fs_NewContourGridFit+0x10 897b3790 8ee89c79 fc11ae78 00000003 897b37cc win32k!bGetGlyphOutline+0xd7 897b37b8 8ee89e72 fc11ae78 00000003 00000001 win32k!bGetGlyphMetrics+0x20 897b38fc 8ee7ef89 fc11ae78 00000003 897b39ec win32k!lGetGlyphBitmap+0x2b 897b3924 8ee7edd6 00000000 00000001 00000003 win32k!ttfdQueryFontData+0x15e 897b3974 8ee7dff2 fc396010 fc1d0cf0 00000001 win32k!ttfdSemQueryFontData+0x45 897b39bc 8ee7e169 fc396010 fc1d0cf0 00000001 win32k!PDEVOBJ::QueryFontData+0x3e 897b3a30 8ee7bc81 00000002 897b3bdc 00000000 win32k!RFONTOBJ::bInitCache+0xd4 897b3aec 8eef8655 897b3bc8 897b3b94 00000003 win32k!RFONTOBJ::bRealizeFont+0x5df 897b3b98 8eef8890 fc74ad80 00000000 00000002 win32k!RFONTOBJ::bInit+0x2f4 897b3bb0 8ee8f111 897b3bc8 00000000 00000002 win32k!RFONTOBJ::vInit+0x16 897b3bd4 8ee8f262 fc1d0cf0 897b3bf4 0678b8bd win32k!GreGetRealizationInfo+0x2a 897b3c24 8284bdc6 37010587 0459f2cc 0459f2e4 win32k!NtGdiGetRealizationInfo+0x41 897b3c24 77346bf4 37010587 0459f2cc 0459f2e4 nt!KiSystemServicePostCall 0459f2e4 00000000 00000000 00000000 00000000 ntdll!KiFastSystemCallRet --- The bugcheck is caused by an attempt to access an out-of-bounds CVT table index (255 in this case, see the ECX register), likely due to a weird behavior of the win32k!itrp_RCVT function, which allows the index to be larger than the size of the array as long as it is smaller than 256. The bug appears to only enable an out-of-bounds read primitive, since at a first glance, the corresponding WCVT instruction handler does not seem to be affected by the same problem. Still, even in its current form, the vulnerability could be used to disclose the contents of adjacent pool allocations to user-mode, potentially leaking sensitive kernel memory or facilitating a KASLR bypass. The issue reproduces on Windows 7 and 8.1. It is easiest to reproduce with Special Pools enabled for win32k.sys, but it is also possible to observe a crash on a default Windows installation. Just hovering over the proof of concept files or opening them in the default Windows Font Viewer tool should be sufficient to trigger the condition. Attached is an archive with two proof of concept font files. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40598.zip

Products Mentioned

Configuraton 0

Microsoft>>.net_framework >> Version 3.0

Microsoft>>.net_framework >> Version 3.5

Microsoft>>.net_framework >> Version 3.5.1

Microsoft>>.net_framework >> Version 4.5.2

Microsoft>>.net_framework >> Version 4.6

Microsoft>>Live_meeting >> Version 2007

Microsoft>>Lync >> Version 2010

Microsoft>>Lync >> Version 2010

Microsoft>>Lync >> Version 2013

Microsoft>>Office >> Version 2007

Microsoft>>Office >> Version 2010

Microsoft>>Silverlight >> Version 5.0

Microsoft>>Skype_for_business >> Version 2016

Microsoft>>Word_viewer >> Version -

Microsoft>>Windows_10 >> Version -

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_8.1 >> Version *

Microsoft>>Windows_rt_8.1 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2012 >> Version -

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_vista >> Version -

References

http://www.securitytracker.com/id/1036988
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/93385
Tags : vdb-entry, x_refsource_BID

More information
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