windows内核提权

   Windows by default are vulnerable to several vulnerabilities that could allow an attacker to execute malicious code in order to abuse a system. From the other side patching systems sufficiently is one of the main problems in security. Even if an organization has a patching policy in place if important patches are not implemented immediately this can still give short window to an attacker to exploit a vulnerability and escalate his privileges inside a system and therefore inside the network.

This article will discuss how to identify missing patches related to privilege escalation and the necessary code to exploit the issue.

Discovery of Missing Patches

The discovery of missing patches can be identified easily either through manual methods or automatic. Manually this can be done easily be executing the following command which will enumerate all the installed patches.

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1	wmic qfe get Caption,Description,HotFixID,InstalledOn

The output will be similar to this:

Enumeration of Installed Patches

The HotFixID can be used in correlation with the table below in order to discover any missing patches related to privilege escalation. As the focus is on privilege escalation the command can be modified slightly to discover patches based on the KB number.

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1	wmic qfe get Caption,Description,HotFixID,InstalledOn | findstr /C:"KB3136041" /C:"KB4018483"

Alternatively this can be done automatically via Metasploit, Credential Nessus Scan or via a custom script that will look for missing patches related to privilege escalation.

Metasploit

There is a Metasploit module which can quickly identify any missing patches based on the Knowledge Base number and specifically patches for which there is a Metasploit module.

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1	post/windows/gather/enum_patches

Metasploit – Patches Enumeration

Windows Exploit Suggester

Gotham Digital Security released a tool with the name Windows Exploit Suggester which compares the patch level of a system against the Microsoft vulnerability database and can be used to identify those exploits that could lead to privilege escalation. The only requirement is that requires the system information from the target.

Windows Exploit Suggester

PowerShell

There is also a PowerShell script which target to identify patches that can lead to privilege escalation. This script is called Sherlock and it will check a system for the following:

• MS10-015 : User Mode to Ring (KiTrap0D)
• MS10-092 : Task Scheduler
• MS13-053 : NTUserMessageCall Win32k Kernel Pool Overflow
• MS13-081 : TrackPopupMenuEx Win32k NULL Page
• MS14-058 : TrackPopupMenu Win32k Null Pointer Dereference
• MS15-051 : ClientCopyImage Win32k
• MS15-078 : Font Driver Buffer Overflow
• MS16-016 : ‘mrxdav.sys’ WebDAV
• MS16-032 : Secondary Logon Handle
• CVE-2017-7199 : Nessus Agent 6.6.2 – 6.10.3 Priv Esc

The output of this tool can be seen below:

Sherlock – Missing Patches

Sherlock – Identification of Privilege Escalation Patches

Privilege Escalation Table

The following table has been compiled to assist in the process of privilege escalation due to lack of sufficient patching.

Operating System	Description	Security Bulletin	KB	Exploit
Windows Server 2016	Windows Kernel Mode Drivers	MS16-135	3199135	Exploit   Github
Windows Server 2008 ,7,8,10 Windows Server 2012	Secondary Logon Handle	MS16-032	3143141	GitHub   ExploitDB Metasploit
Windows Server 2008, Vista, 7	WebDAV	MS16-016	3136041	Github
Windows Server 2003, Windows Server 2008, Windows 7, Windows 8, Windows 2012	Windows Kernel Mode Drivers	MS15-051	3057191	GitHub   ExploitDB Metasploit
Windows Server 2003, Windows Server 2008, Windows Server 2012, 7, 8	Win32k.sys	MS14-058	3000061	GitHub   ExploitDB Metasploit
Windows Server 2003, Windows Server 2008, 7, 8, Windows Server 2012	AFD Driver	MS14-040	2975684	Python   EXE ExploitDB Github
Windows XP, Windows Server 2003	Windows Kernel	MS14-002	2914368	Metasploit
Windows Server 2003, Windows Server 2008, 7, 8, Windows Server 2012	Kernel Mode Driver	MS13-005	2778930	Metasploit   ExploitDB GitHub
Windows Server 2008, 7	Task Scheduler	MS10-092	2305420	Metasploit   ExploitDB
Windows Server 2003, Windows Server 2008, 7, XP	KiTrap0D	MS10-015	977165	Exploit   ExploitDB GitHub Metasploit
Windows Server 2003, XP	NDProxy	MS14-002	2914368	Exploit   ExploitDB ExploitDB Github
Windows Server 2003, Windows Server 2008, 7, 8, Windows Server 2012	Kernel Driver	MS15-061	3057839	Github
Windows Server 2003, XP	AFD.sys	MS11-080	2592799	EXE   Metasploit ExploitDB
Windows Server 2003, XP	NDISTAPI	MS11-062	2566454	ExploitDB
Windows Server 2003, Windows Server 2008, 7, 8, Windows Server 2012	RPC	MS15-076	3067505	Github
Windows Server 2003, Windows Server 2008, 7, 8, Windows Server 2012	Hot Potato	MS16-075	3164038	GitHub   PowerShell HotPotato
Windows Server 2003, Windows Server 2008, 7, XP	Kernel Driver	MS15-010	3036220	GitHub   ExploitDB
Windows Server 2003, Windows Server 2008, 7, XP	AFD.sys	MS11-046	2503665	EXE   ExploitDB