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CVE-2016-0070 : Détail

CVE-2016-0070

5.5
/
MEDIUM
A01-Broken Access Control
0.14%V3
Local
2016-10-13 23:00 +00:00
2018-10-12 17:57 +00:00
CVE.org
NVD

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Descriptions

The kernel 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, and Windows 10 Gold, 1511, and 1607 allows local users to gain privileges via a crafted application that makes an API call to access sensitive information in the registry, aka "Windows Kernel Local Elevation of Privilege Vulnerability."

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 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

 [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 : 40600

Date de publication : 2016-10-19 22:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=873 We have encountered Windows kernel crashes in the memmove() function called by nt!CmpCheckValueList while loading corrupted registry hive files. An example of a crash log excerpt generated after triggering the bug is shown below: --- ATTEMPTED_WRITE_TO_READONLY_MEMORY (be) An attempt was made to write to readonly memory. The guilty driver is on the stack trace (and is typically the current instruction pointer). When possible, the guilty driver's name (Unicode string) is printed on the bugcheck screen and saved in KiBugCheckDriver. Arguments: Arg1: b008d000, Virtual address for the attempted write. Arg2: 45752121, PTE contents. Arg3: a5d9b590, (reserved) Arg4: 0000000b, (reserved) Debugging Details: ------------------ [...] STACK_TEXT: a5d9b60c 81820438 b008cb40 b008cb44 fffffffc nt!memmove+0x33 a5d9b670 8181f4f0 ab3709c8 00000000 b008cb34 nt!CmpCheckValueList+0x520 a5d9b6bc 8181fc01 03010001 0000b3b8 00000020 nt!CmpCheckKey+0x661 a5d9b6f4 818206d0 ab3709c8 03010001 00000001 nt!CmpCheckRegistry2+0x89 a5d9b73c 8182308f 03010001 8000057c 80000498 nt!CmCheckRegistry+0xfb a5d9b798 817f6fa0 a5d9b828 00000002 00000000 nt!CmpInitializeHive+0x55c a5d9b85c 817f7d85 a5d9bbb8 00000000 a5d9b9f4 nt!CmpInitHiveFromFile+0x1be a5d9b9c0 817ffaae a5d9bbb8 a5d9ba88 a5d9ba0c nt!CmpCmdHiveOpen+0x50 a5d9bacc 817f83b8 a5d9bb90 a5d9bbb8 00000010 nt!CmLoadKey+0x459 a5d9bc0c 8168edc6 0025fd58 00000000 00000010 nt!NtLoadKeyEx+0x56c a5d9bc0c 77806bf4 0025fd58 00000000 00000010 nt!KiSystemServicePostCall WARNING: Frame IP not in any known module. Following frames may be wrong. 0025fdc0 00000000 00000000 00000000 00000000 0x77806bf4 --- The root cause of the bug seems to be that the nt!CmpCheckValueList function miscalculates the number of items to be shifted to the left in an array with 4-byte entries, resulting in the following call: RtlMoveMemory(&array[x], &array[x + 1], 4 * (--y - x)); Here, the eventual value of the size parameter becomes negative (--y is smaller than x), but is treated by RtlMoveMemory as an unsigned integer, which is way beyond the size of the memory region, resulting in memory corruption. In a majority of observed cases, the specific negative value ended up being 0xfffffffc (-4), but we have also seen a few samples which crashed with size=0xfffffff8 (-8). The issue reproduces on Windows 7. Considering the huge memory copy size, the crash should manifest both with and without Special Pools enabled. In order to reproduce the problem with the provided samples, it is necessary to load them with a dedicated program which calls the RegLoadAppKey() API. Attached are three proof of concept hive files. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40600.zip

Products Mentioned

Configuraton 0

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.securityfocus.com/bid/93354
Tags : vdb-entry, x_refsource_BID

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