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CVE-2017-0211 : Détail

CVE-2017-0211

5.5
/
MEDIUM
A03-Injection
0.38%V3
Local
2017-04-12 12:00 +00:00
2017-08-15 07:57 +00:00
CVE.org
NVD

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Descriptions

An elevation of privilege vulnerability exists in Windows 10, Windows 8.1, Windows RT 8.1, Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016 versions of Microsoft Windows OLE when it fails an integrity-level check, aka "Windows OLE Elevation of Privilege Vulnerability."

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-610 Externally Controlled Reference to a Resource in Another Sphere
The product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.

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:N/I:H/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.

None

There is no loss of confidentiality within the impacted component.

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.

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:N/I:P/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 : 41902

Date de publication : 2017-04-19 22:00 +00:00
Auteur : Google Security Research
EDB Vérifié : Yes

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1079 Windows: Runtime Broker ClipboardBroker EoP Platform: Windows 10 10586/14393 not tested 8.1 Update 2 Class: Elevation of Privilege Summary: The Runtime Broker’s Clipboard Broker allows any low IL/AppContainer (such as Edge or IE EPM) to get access to an OOP IStorage object through the ClipboardBroker leading to a sandbox escape. Description: Windows 8 and above have a COM service running as the normal user called the Runtime Broker which performs a few services for AppContainer and low IL processes. One of these services is brokering access to the Clipboard which would normally be restricted. I know at minimum this is used in Edge content processes. The broker does prevent things like setting data to the current IDataObject but allows AC applications to set their own IDataObject. To do things like blocking SetData the application provided IDataObject object is wrapped by an OLE32 implementation. We can abuse this functionality by first setting our own IDataObject using SetClipboard then calling GetClipboard to get back the OOP IDataObject wrapper. As this is a wrapper it will never marshal the original IDataObject back to the caller so calling methods on the wrapper will execute code inside the Runtime Broker process running outside the sandbox. If we call something GetData on the OOP wrapper requesting an IStorage object the wrapper will attempt to callback to the IDataObject from the the application to see if that data exists. It does this initially using the GetDataHere method. As this method takes an IN/OUT STGMEDIUM structure it needs to be initialized, it so happens that in this case it will initialize it with an empty READ/WRITE IStorage object. This is passed back to the calling application, however because the default implementation of IStorage does not use custom marshaling (at least for OOP) the IStorage object also never leaves the runtime broker process. We can now do the traditional dance of querying for IPropertyBag, settings a serializable object (such as MSXML DOMDocument) then reading it back out again. Again this XML DOMDocument object is trapped in the Runtime Broker process, so by running some JScript in an XSLT transform we can get arbitrary code executing outside of the sandbox. Presumably you wouldn’t even need to do this loopback trick if some other application has pasted an IStorage object to the clipboard, however by doing this we can exploit at any time. I’m sure there’s plenty of edge cases where access to an IStorage object is possible. The security on Runtime broker allows any AppContainer and low IL application to Launch/Activate and Access, so this would be a general sandbox escape from a number of sandbox types. Proof of Concept: I’ve provided a PoC as a C# source code file. You need to compile it first. Note that depending on the version of Windows the IIDs for the various interfaces might change, the PoC is only setup for 10.14393 updated to January 2017. Also the PoC must be considered a foreground window otherwise getting/setting the clipboard will fail. In a real scenario this isn’t an issue, I’ve verified that Edge content processes do use the broker if you copy and paste. 1) Compile the C# source code file. 2) Execute the PoC executable as a low privileged user such as AppContainer or low IL. 3) Notepad should appear running at medium as a child of RuntimeBroker.exe. Expected Result: Access blocked to storage objects in the clipboard. Observed Result: The storage object is accessed and abused to escape the sandbox. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/41902.zip

Products Mentioned

Configuraton 0

Microsoft>>Windows_10 >> Version *

Microsoft>>Windows_10 >> Version 1511

Microsoft>>Windows_10 >> Version 1607

Microsoft>>Windows_10 >> Version 1703

Microsoft>>Windows_8.1 >> Version *

Microsoft>>Windows_rt_8.1 >> Version *

Microsoft>>Windows_server_2012 >> Version *

Microsoft>>Windows_server_2012 >> Version r2

Microsoft>>Windows_server_2016 >> Version *

References

https://www.exploit-db.com/exploits/41902/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securitytracker.com/id/1038240
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/97514
Tags : vdb-entry, x_refsource_BID

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