ID CVE-2015-0002
Summary The AhcVerifyAdminContext function in ahcache.sys in the Application Compatibility component in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 does not verify that an impersonation token is associated with an administrative account, which allows local users to gain privileges by running AppCompatCache.exe with a crafted DLL file, aka MSRC ID 20544 or "Microsoft Application Compatibility Infrastructure Elevation of Privilege Vulnerability."
References
Vulnerable Configurations
  • cpe:2.3:o:microsoft:windows_7:-:sp1
    cpe:2.3:o:microsoft:windows_7:-:sp1
  • cpe:2.3:o:microsoft:windows_8
    cpe:2.3:o:microsoft:windows_8
  • cpe:2.3:o:microsoft:windows_8.1
    cpe:2.3:o:microsoft:windows_8.1
  • Microsoft Windows RT Gold
    cpe:2.3:o:microsoft:windows_rt:-:gold
  • Microsoft Windows RT 8.1
    cpe:2.3:o:microsoft:windows_rt_8.1
  • Microsoft Windows Server 2008 R2 Service Pack 1
    cpe:2.3:o:microsoft:windows_server_2008:r2:sp1
  • Microsoft Windows Server 2012 Gold
    cpe:2.3:o:microsoft:windows_server_2012:-:gold
  • cpe:2.3:o:microsoft:windows_server_2012:r2:-:-:-:-:x64
    cpe:2.3:o:microsoft:windows_server_2012:r2:-:-:-:-:x64
CVSS
Base: 7.2 (as of 14-01-2015 - 16:20)
Impact:
Exploitability:
CWE CWE-264
CAPEC
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Blue Boxing
    This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
  • Target Programs with Elevated Privileges
    This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
Access
VectorComplexityAuthentication
LOCAL LOW NONE
Impact
ConfidentialityIntegrityAvailability
COMPLETE COMPLETE COMPLETE
exploit-db via4
description Windows: Elevation of Privilege in ahcache.sys/NtApphelpCacheControl. CVE-2015-0002. Local exploit for windows platform
id EDB-ID:35661
last seen 2016-02-04
modified 2015-01-01
published 2015-01-01
reporter Google Security Research
source https://www.exploit-db.com/download/35661/
title Windows 8.1 32/64 bit - Privilege Escalation ahcache.sys/NtApphelpCacheControl
metasploit via4
description On Windows, the system call NtApphelpCacheControl (the code is actually in ahcache.sys) allows application compatibility data to be cached for quick reuse when new processes are created. A normal user can query the cache but cannot add new cached entries as the operation is restricted to administrators. This is checked in the function AhcVerifyAdminContext. This function has a vulnerability where it doesn't correctly check the impersonation token of the caller to determine if the user is an administrator. It reads the caller's impersonation token using PsReferenceImpersonationToken and then does a comparison between the user SID in the token to LocalSystem's SID. It doesn't check the impersonation level of the token so it's possible to get an identify token on your thread from a local system process and bypass this check. This module currently only affects Windows 8 and Windows 8.1, and requires access to C:\Windows\System\ComputerDefaults.exe (although this can be improved).
id MSF:EXPLOIT/WINDOWS/LOCAL/NTAPPHELPCACHECONTROL
last seen 2019-03-15
modified 2017-07-24
published 2015-01-02
reliability Normal
reporter Rapid7
source https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/local/ntapphelpcachecontrol.rb
title MS15-001 Microsoft Windows NtApphelpCacheControl Improper Authorization Check
msbulletin via4
bulletin_id MS15-001
bulletin_url
date 2015-01-13T00:00:00
impact Elevation of Privilege
knowledgebase_id 3023266
knowledgebase_url
severity Important
title Vulnerability in Windows Application Compatibility Cache Could Allow Elevation of Privilege
nessus via4
NASL family Windows : Microsoft Bulletins
NASL id SMB_NT_MS15-001.NASL
description The remote Windows host is affected by a privilege escalation vulnerability due to improper validation of the authorization of a caller's impersonation token in the Microsoft Windows Application Compatibility Infrastructure (AppCompat) component. A local attacker, with a specially crafted program, can bypass the authorization check to create cache entries, resulting in an escalation of privileges.
last seen 2019-02-21
modified 2018-11-15
plugin id 80490
published 2015-01-13
reporter Tenable
source https://www.tenable.com/plugins/index.php?view=single&id=80490
title MS15-001: Vulnerability in Windows Application Compatibility Cache Could Allow Elevation of Privilege (3023266)
packetstorm via4
data source https://packetstormsecurity.com/files/download/129978/ntapphelpcachecontrol.rb.txt
id PACKETSTORM:129978
last seen 2016-12-05
published 2015-01-15
reporter sinn3r
source https://packetstormsecurity.com/files/129978/Microsoft-Windows-NtApphelpCacheControl-Improper-Authorization-Check.html
title Microsoft Windows NtApphelpCacheControl Improper Authorization Check
refmap via4
bid 71972
misc
ms MS15-001
secunia 61277
xf
  • ms-appcompatcache-cve20150002-priv-esc(99523)
  • win-ms15kb3023266-update(99524)
Last major update 02-01-2017 - 21:59
Published 13-01-2015 - 17:59
Last modified 12-10-2018 - 18:07
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