CVE-2016-7216 : Detail

CVE-2016-7216

5.5
/
Medium
A01-Broken Access Control
0.06%V3
Local
2016-11-10
05h16 +00:00
2018-10-12
17h57 +00:00
CVE.org
NVD
Notifications for a CVE
Stay informed of any changes for a specific CVE.
Notifications manage

CVE Descriptions

The kernel API in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 mishandles permissions, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Elevation of Privilege Vulnerability."

CVE 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.
CWE-264 Category : Permissions, Privileges, and Access Controls
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

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

None

The vulnerable system can be exploited without interaction from any user.

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 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N [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 : 40766

Publication date : 2016-11-14 23h00 +00:00
Author : Google Security Research
EDB Verified : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=874 We have encountered a Windows kernel crash in the nt!RtlEqualSid function invoked through nt!SeAccessCheck by nt!CmpCheckSecurityCellAccess while loading corrupted registry hive files. An example of a crash log excerpt generated after triggering the bug is shown below: --- PAGE_FAULT_BEYOND_END_OF_ALLOCATION (cd) N bytes of memory was allocated and more than N bytes are being referenced. This cannot be protected by try-except. When possible, the guilty driver's name (Unicode string) is printed on the bugcheck screen and saved in KiBugCheckDriver. Arguments: Arg1: a1f11004, memory referenced Arg2: 00000000, value 0 = read operation, 1 = write operation Arg3: 816d40b3, if non-zero, the address which referenced memory. Arg4: 00000000, Mm internal code. Debugging Details: ------------------ [...] STACK_TEXT: 92bbb5e4 816f92b9 a1f11004 83af4ff0 92bbb6ac nt!RtlEqualSid+0x9 92bbb604 816d3292 00000000 20204d43 00000000 nt!RtlpOwnerAcesPresent+0x87 92bbb634 816d3cfe a1f10f50 00000001 00bbb6b0 nt!SeAccessCheckWithHint+0x178 92bbb668 818f8ff8 a1f10f50 92bbb6b0 00000000 nt!SeAccessCheck+0x2a 92bbb6c0 81820906 a75e69c8 000051d8 00000001 nt!CmpCheckSecurityCellAccess+0xe5 92bbb6fc 818206ad 03010001 92bbb728 92bbb718 nt!CmpValidateHiveSecurityDescriptors+0x1bd 92bbb73c 8182308f 03010001 80000588 8000054c nt!CmCheckRegistry+0xd8 92bbb798 817f6fa0 92bbb828 00000002 00000000 nt!CmpInitializeHive+0x55c 92bbb85c 817f7d85 92bbbbb8 00000000 92bbb9f4 nt!CmpInitHiveFromFile+0x1be 92bbb9c0 817ffaae 92bbbbb8 92bbba88 92bbba0c nt!CmpCmdHiveOpen+0x50 92bbbacc 817f83b8 92bbbb90 92bbbbb8 00000010 nt!CmLoadKey+0x459 92bbbc0c 8168edc6 0014f8a4 00000000 00000010 nt!NtLoadKeyEx+0x56c 92bbbc0c 77cc6bf4 0014f8a4 00000000 00000010 nt!KiSystemServicePostCall WARNING: Frame IP not in any known module. Following frames may be wrong. 0014f90c 00000000 00000000 00000000 00000000 0x77cc6bf4 [...] FOLLOWUP_IP: nt!RtlEqualSid+9 816d40b3 668b06 mov ax,word ptr [esi] --- The issue reproduces on Windows 7. It is easiest to reproduce with Special Pools enabled for the NT kernel (leading to an immediate crash when the bug is triggered), but it is also possible to observe a crash on a default Windows installation. In order to reproduce the problem with the provided sample, it is necessary to load it with a dedicated program which calls the RegLoadAppKey() API. 3 samples attached with single-byte differences compared to the original file, and the base sample itself. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40766.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.securityfocus.com/bid/94048
Tags : vdb-entry, x_refsource_BID
http://www.securitytracker.com/id/1037253
Tags : vdb-entry, x_refsource_SECTRACK
https://www.exploit-db.com/exploits/40766/
Tags : exploit, x_refsource_EXPLOIT-DB