CVE-2018-0952 : Detail

CVE-2018-0952

7.8
/
High
95.66%V3
Local
2018-08-15
15h00 +00:00
2018-08-24
07h57 +00:00
CVE.org
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CVE Descriptions

An Elevation of Privilege vulnerability exists when Diagnostics Hub Standard Collector allows file creation in arbitrary locations, aka "Diagnostic Hub Standard Collector Elevation Of Privilege Vulnerability." This affects Windows Server 2016, Windows 10, Microsoft Visual Studio, Windows 10 Servers.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE Other No informations.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 7.8 HIGH CVSS:3.0/AV:L/AC:L/PR:L/UI:N/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.

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.

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 7.2 AV:L/AC:L/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 : 45244

Publication date : 2018-08-21 22h00 +00:00
Author : Atredis Partners
EDB Verified : Yes

SystemCollector PoC for Privilege Escalation in Windows 10 Diagnostics Hub Standard Collector Service Affected Products Windows 10 Windows Server Windows Server 2016 Visual Studio 2015 Update 3 Visual Studio 2017 Summary The Diagnostics Hub Packaging library, used by Windows Standard Collector Service, can be forced to copy an arbitrary file to an arbitrary location due to lack of client impersonation in DiagnosticsHub.StandardCollector.Runtime.dll. Here is a detailed write-up on how this vulnerability was found and exploited: Privilege Escalation Vulnerability in Windows Standard Collector Service. Technical Details The Standard Collector Service allows for a several values to be defined when configuring a diagnostics session, including the scratch directory and session ID. The session ID can be any GUID and the scratch directory can be any location the user has write permissions too. If the collection session is configured with an ID of c13851b2-b1e1-438f-bf73-949df897f1bf and a scratch path of C:\Users\Bob\AppData\Local\Temp\Microsoft\F12\perftools\visualprofiler\, the following events occur when calling the GetCurrentResult method of the ICollectionSession object: An Event Trace Log (.etl) file is created in the scratch path: C:\Users\Bob\AppData\Local\Temp\Microsoft\F12\perftools\visualprofiler\c13851b2-b1e1-438f-bf73-949df897f1bf.1.m.etl A Report folder is also created in the scratch path: C:\Users\Bob\AppData\Local\Temp\Microsoft\F12\perftools\visualprofiler\Report.c13851b2-b1e1-438f-bf73-949df897f1bf.1 A folder with a random GUID is created in the report folder: C:\Users\Bob\AppData\Local\Temp\Microsoft\F12\perftools\visualprofiler\Report.c13851b2-b1e1-438f-bf73-949df897f1bf.1\EAD6A227-31D4-4EA2-94A9-5DF276F69E65 These folders and ETL files are created by the collector service for the .diagsession package that is normally created when a session has ended. Calling the Stop method on the ICollectionSession object will cause the collector service to commit the diagnostics package by calling Microsoft::DiagnosticsHub::Packaging::DhPackageDirectory::CommitPackage. The CommitPackage function will copy or move the original {scratch path}\c13851b2-b1e1-438f-bf73-949df897f1bf.1.m.etl file to the random GUID folder: {scratch path}\Report.c13851b2-b1e1-438f-bf73-949df897f1bf.1\EAD6A227-31D4-4EA2-94A9-5DF276F69E65\c13851b2-b1e1-438f-bf73-949df897f1bf.1.m.etl The copy/move operation triggered by the CommitPackagingResult function in DiagnosticsHub.StandardCollector.Runtime.dll, is performed without impersonating the user (unlike the initial file/folder creation), leading to a possible TOCTOU issue if the target folder is replaced with a mount point that redirects the copy to an arbitrary location. To exploit this issue in a useful way, an attacker would need to swap the contents of the ETL file before it is copied. This can be done by beating the race condition with an OpLock after the file handle has been released by the service. Although we don't fully control the name of the .etl file that is copied, we can use the object directory symlink trick to control it. The mount point+symlink setup would look something like this: Mount point: {scratch path}\Report.c13851b2-b1e1-438f-bf73-949df897f1bf.1\EAD6A227-31D4-4EA2-94A9-5DF276F69E65\ -> \RPC Control\ Symlink: \RPC Control\c13851b2-b1e1-438f-bf73-949df897f1bf.1.m.etl -> C:\Windows\System32\anything.dll Having control of the file contents, copy location, and file name gives an attacker numerous DLL loading possibilities. However, the included PoC demonstrates how control of the filename is not needed since the collector service happily load a DLL with any filename, as long as it is in C:\Windows\System32 or C:\Windows\System32\DiagSvcs directory. This is done by starting a new collector session with an agent that has an assembly name matching the name of the copied DLL c13851b2-b1e1-438f-bf73-949df897f1bf.1.m.etl. The included PoC is a VS solution with a C++ DLL project for the notepad.exe popping payload and a C# project to interact with the service and exploit the vulnerability with the NtApiDotNet library. Steps to reproduce: Build Visual Studio Solution Execute SystemCollector.exe as a normal user Expected Result: The package commit operation impersonates the user and fails when trying to copy the file. Observed Result: The file is copied to the mount point target folder C:\Windows\System32, then loaded as a collector agent, and finally, notepad.exe is spawned as SYSTEM privileges. Additional References https://www.atredis.com/blog/cve-2018-0952-privilege-escalation-vulnerability-in-windows-standard-collector-service https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0952 https://github.com/atredispartners/advisories/blob/master/ATREDIS-2018-0004.md Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/45244.zip

Products Mentioned

Configuraton 0

Microsoft>>Visual_studio_2015 >> Version -

    Microsoft>>Visual_studio_2017 >> Version -

    Microsoft>>Visual_studio_2017 >> Version 15.8

    Microsoft>>Windows_10 >> Version -

    Microsoft>>Windows_10 >> Version 1607

    Microsoft>>Windows_10 >> Version 1703

    Microsoft>>Windows_10 >> Version 1709

    Microsoft>>Windows_10 >> Version 1803

    Microsoft>>Windows_server_2016 >> Version -

    Microsoft>>Windows_server_2016 >> Version 1709

    Microsoft>>Windows_server_2016 >> Version 1803

    References

    http://www.securityfocus.com/bid/105048
    Tags : vdb-entry, x_refsource_BID
    https://www.exploit-db.com/exploits/45244/
    Tags : exploit, x_refsource_EXPLOIT-DB
    http://www.securitytracker.com/id/1041466
    Tags : vdb-entry, x_refsource_SECTRACK