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"VMware Workstation 14.1.5 / VMware Player 15 - Host VMX Process COM Class Hijack Privilege Escalation"

Author

"Google Security Research"

Platform

windows

Release date

2019-03-25

Release Date Title Type Platform Author
2019-04-19 "Oracle Business Intelligence / XML Publisher 11.1.1.9.0 / 12.2.1.3.0 / 12.2.1.4.0 - XML External Entity Injection" webapps windows "Vahagn Vardanyan"
2019-04-19 "Oracle Business Intelligence 11.1.1.9.0 / 12.2.1.3.0 / 12.2.1.4.0 - Directory Traversal" webapps windows "Vahagn Vardanyan"
2019-04-18 "ManageEngine Applications Manager 11.0 < 14.0 - SQL Injection / Remote Code Execution (Metasploit)" remote windows AkkuS
2019-04-17 "MailCarrier 2.51 - POP3 'RETR' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-17 "DHCP Server 2.5.2 - Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV PostLuafvPostReadWrite SECTION_OBJECT_POINTERS Race Condition Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cache Manager Poisoning Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV LuafvCopyShortName Arbitrary Short Name Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cross Process Handle Duplication Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization MAXIMUM_ACCESS DesiredAccess Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 / 1709 - CSRSS SxSSrv Cached Manifest Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Zoho ManageEngine ADManager Plus 6.6 (Build < 6659) - Privilege Escalation" local windows "Digital Interruption"
2019-04-16 "AdminExpress 1.2.5 - 'Folder Path' Denial of Service (PoC)" dos windows "Mücahit İsmail Aktaş"
2019-04-16 "PCHelpWare V2 1.0.0.5 - 'Group' Denial of Service (PoC)" dos windows "Alejandra Sánchez"
2019-04-16 "PCHelpWare V2 1.0.0.5 - 'SC' Denial of Service (PoC)" dos windows "Alejandra Sánchez"
2019-04-15 "MailCarrier 2.51 - POP3 'TOP' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "MailCarrier 2.51 - POP3 'LIST' SEH Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "MailCarrier 2.51 - POP3 'USER' Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "RemoteMouse 3.008 - Arbitrary Remote Command Execution" remote windows 0rphon
2019-04-15 "MailCarrier 2.51 - 'RCPT TO' Buffer Overflow" remote windows "Dino Covotsos"
2019-04-15 "UltraVNC Launcher 1.2.2.4 - 'Path' Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-15 "UltraVNC Viewer 1.2.2.4 - 'VNC Server' Denial of Service (PoC)" dos windows "Victor Mondragón"
2019-04-12 "Microsoft Windows - Contact File Format Arbitary Code Execution (Metasploit)" local windows Metasploit
2019-04-12 "Microsoft Internet Explorer 11 - XML External Entity Injection" local windows hyp3rlinx
2019-04-12 "CyberArk EPM 10.2.1.603 - Security Restrictions Bypass" local windows "Alpcan Onaran"
2019-04-10 "FTPShell Server 6.83 - 'Virtual Path Mapping' Local Buffer" local windows "Dino Covotsos"
2019-04-10 "FTPShell Server 6.83 - 'Account name to ban' Local Buffer" local windows "Dino Covotsos"
2019-04-09 "Microsoft Windows - AppX Deployment Service Privilege Escalation" local windows "Nabeel Ahmed"
2019-04-08 "Download Accelerator Plus (DAP) 10.0.6.0 - SEH Buffer Overflow" local windows "Peyman Forouzan"
Release Date Title Type Platform Author
2019-04-17 "Oracle Java Runtime Environment - Heap Corruption During TTF font Rendering in GlyphIterator::setCurrGlyphID" dos multiple "Google Security Research"
2019-04-17 "Oracle Java Runtime Environment - Heap Corruption During TTF font Rendering in sc_FindExtrema4" dos multiple "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV PostLuafvPostReadWrite SECTION_OBJECT_POINTERS Race Condition Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cache Manager Poisoning Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV LuafvCopyShortName Arbitrary Short Name Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization Cross Process Handle Duplication Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 - LUAFV Delayed Virtualization MAXIMUM_ACCESS DesiredAccess Privilege Escalation" local windows "Google Security Research"
2019-04-16 "Microsoft Windows 10 1809 / 1709 - CSRSS SxSSrv Cached Manifest Privilege Escalation" local windows "Google Security Research"
2019-04-03 "Google Chrome 72.0.3626.96 / 74.0.3702.0 - 'JSPromise::TriggerPromiseReactions' Type Confusion" remote multiple "Google Security Research"
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2019-04-03 "Google Chrome 72.0.3626.81 - 'V8TrustedTypePolicyOptions::ToImpl' Type Confusion" dos multiple "Google Security Research"
2019-04-03 "WebKitGTK+ - 'ThreadedCompositor' Race Condition" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - CodeBlock Dangling Watchpoints Use-After-Free" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - Out-Of-Bounds Access in FTL JIT due to LICM Moving Array Access Before the Bounds Check" dos multiple "Google Security Research"
2019-04-03 "iOS < 12.2 / macOS < 10.14.4 XNU - pidversion Increment During execve is Unsafe" dos multiple "Google Security Research"
2019-04-03 "WebKit JavaScriptCore - 'createRegExpMatchesArray' Type Confusion" dos multiple "Google Security Research"
2019-04-03 "SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)" dos multiple "Google Security Research"
2019-03-28 "gnutls 3.6.6 - 'verify_crt()' Use-After-Free" dos linux "Google Security Research"
2019-03-26 "Spidermonkey - IonMonkey Type Inference is Incorrect for Constructors Entered via OSR" dos multiple "Google Security Research"
2019-03-25 "VMware Workstation 14.1.5 / VMware Player 15 - Host VMX Process COM Class Hijack Privilege Escalation" local windows "Google Security Research"
2019-03-25 "VMware Workstation 14.1.5 / VMware Player 15.0.2 - Host VMX Process Impersonation Hijack Privilege Escalation" local windows "Google Security Research"
2019-03-22 "snap - seccomp BBlacklist for TIOCSTI can be Circumvented" dos linux "Google Security Research"
2019-03-19 "Google Chrome < M73 - FileSystemOperationRunner Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - MidiManagerWin Use-After-Free" dos multiple "Google Security Research"
2019-03-19 "Microsoft Edge - Flash click2play Bypass with CObjectElement::FinalCreateObject" dos windows "Google Security Research"
2019-03-19 "Microsoft VBScript - VbsErase Memory Corruption" dos windows "Google Security Research"
2019-03-19 "Microsoft Internet Explorer 11 - VBScript Execution Policy Bypass in MSHTML" dos windows "Google Security Research"
2019-03-19 "Google Chrome < M73 - Data Race in ExtensionsGuestViewMessageFilter" dos multiple "Google Security Research"
2019-03-19 "Google Chrome < M73 - Double-Destruction Race in StoragePartitionService" dos multiple "Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46601/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46601/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46601/41044/vmware-workstation-1415-vmware-player-15-host-vmx-process-com-class-hijack-privilege-escalation/download/", "exploit_id": "46601", "exploit_description": "\"VMware Workstation 14.1.5 / VMware Player 15 - Host VMX Process COM Class Hijack Privilege Escalation\"", "exploit_date": "2019-03-25", "exploit_author": "\"Google Security Research\"", "exploit_type": "local", "exploit_platform": "windows", "exploit_port": null}
                                            

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VMware: Host VMX Process COM Class Hijack EoP
Platform: VMware Workstation Windows v14.1.5 (on Windows 10). Also tested VMware Player 15.
Class: Elevation of Privilege

Summary: COM classes used by the VMX process on a Windows host can be hijacked leading to elevation of privilege.

Description: The VMX process (vmware-vmx.exe) process configures and hosts an instance of VM. As is common with desktop virtualization platforms the VM host usually has privileged access into the OS such as mapping physical memory which represents a security risk. To mitigate this the VMX process is created with an elevated integrity level by the authentication daemon (vmware-authd.exe) which runs at SYSTEM. This prevents a non-administrator user opening the process and abusing its elevated access.

Unfortunately the process is created as the desktop user which results in the elevated process sharing resources such as COM registrations with the normal user who can modify the registry to force an arbitrary DLL to be loaded into the VMX process. 

The COM classes observed to be loaded by the VMX process, and thus can be hijacked by modifying the registry  are as follows:

1b1cad8c-2dab-11d2-b604-00104b703efd Microsoft WBEM (non)Standard Marshaling for IEnumWbemClassObject
7c857801-7381-11cf-884d-00aa004b2e24 PSFactoryBuffer
8bc3f05e-d86b-11d0-a075-00c04fb68820 Windows Management and Instrumentation
bcde0395-e52f-467c-8e3d-c4579291692e MMDeviceEnumerator class
cb8555cc-9128-11d1-ad9b-00c04fd8fdff WbemAdministrativeLocator Class
d68af00a-29cb-43fa-8504-ce99a996d9ea Microsoft WBEM (non)Standard Marshaling for IWbemServices
e7d35cfa-348b-485e-b524-252725d697ca PSFactoryBuffer

The majority of these are related to WMI and are probably not critical so could be removed, however MMDeviceEnumerator is used to find audio devices which is probably important. Also note that hijacking COM classes isnt necessarily the only resource which could be hijacked. From a fixing perspective I don't know of any documented way of preventing the lookup of COM classes from HKEY_CURRENT_USER other than running the process as an administrator, about all you can do is not use COM at all. As with the other bug Ive reported at the same time a more comprehensive fix would probably to not create the process as the desktop user, instead using another user identity, however that in itself has risks.

Proof of Concept:

Ive provided a PoC as a C++ project. 

1) Compile the project, make sure to compile the x64 version of the DLL otherwise the PoC will fail.
2) Copy the compiled HijackDll.dll to the folder c:\hijack. 
3) Install the hijack.reg file using REGEDIT or the command line REG tool. This setups up a hijack of the CB8555CC-9128-11D1-AD9B-00C04FD8FDFF class. 
4) Start a VMX instance using the normal GUI or vmrun.

Expected Result:
The system COM class is loaded into the VMX.

Observed Result:
The VMX process loads the hijack DLL into memory and a dialog box appears proving the code injection.


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/46601.zip