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"Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass"

Author

"Google Security Research"

Platform

windows

Release date

2019-04-16

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"
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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"
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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"
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46716/?format=json')
                                                {"url": "https://www.nmmapper.com/api/exploitdetails/46716/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/46716/41155/microsoft-windows-10-1809-luafv-ntsetcachedsigninglevel-device-guard-bypass/download/", "exploit_id": "46716", "exploit_description": "\"Microsoft Windows 10 1809 - LUAFV NtSetCachedSigningLevel Device Guard Bypass\"", "exploit_date": "2019-04-16", "exploit_author": "\"Google Security Research\"", "exploit_type": "local", "exploit_platform": "windows", "exploit_port": null}
                                            

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Windows: LUAFV NtSetCachedSigningLevel Device Guard Bypass
Platform: Windows 10 1809 (not tested earlier). Note Ive not tested this on Windows 10 SMode.
Class: Security Feature Bypass

Summary: 

The NtSetCachedSigningLevel system call can be tricked by the operation of LUAFV to apply a cached signature to an arbitrary file leading to a bypass of code signing enforcement under UMCI with Device Guard.

Description:

As Ive hit this API multiple times by now Im not going to explain its operation. The novel aspect of this issue is that you can get the LUAFV driver to win the signing race between reading the file to determine the hash to sign and the file the kernel EA is assigned to.

The exploit is as follows:

1) Create a file with the contents of a valid Microsoft signed file, such as notepad.exe in a virtualized location.
2) Get LUAFV to virtualize that file by requesting DELETE access. DELETE is not considered a write access right for the purposes of any checks in the signing process.
3) Copy the unsigned executable to the virtual store with the target virtualized name.
4) Call NtSetCachedSigningLevel on the virtualized file specifying flag 4. 

This sequence results in the signing code reading the virtualized file, which contains the contents of notepad.exe and generating the signature based on that data. However when it goes to write the kernel EA the LUAFV driver considers that a write operation and virtualizes the file underneath. As weve created an arbitrary file in the virtual store the driver binds the file object to the unsigned file before writing out the kernel EA. This results in the EA going to the unsigned file rather than the original signed file. As you cant virtualize files with executable extensions you must ensure the signed file has an allowed extension, however once youve signed the file you can rename it to something more appropriate.

Note that I have checked that Windows 10 Pro SMode does load the LUAFV driver, however Ive not checked that this bypass will work on it (but no reason to believe it doesnt).

Proof of Concept:

Ive provided a PoC as a C# project. It will sign an arbitrary DLL file the map it into memory with the Microsoft only signature mitigation enabled.

1) Compile the C# project. Itll need to pull NtApiDotNet from NuGet to build.
2) As a normal user run the PoC passing the path to an unsigned DLL which will do something noticeable in DllMain (such as popping a message box).

Expected Result:
The cached signature operation fails.

Observed Result:
The an arbitrary file is cached signed and can be loaded with an elevated process signature level.


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/46716.zip