Finding Privesc with Procmon

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FINDING PRIVESC WITH PROCMON Vetle Økland ::1 • Pentester @ Nagarro • Live here in Oslo • Too young to understand why Windows does anything • Twitter: @bordplate • Blog: https://bordplate.no/blog/en What is Procmon? Process Monitor Boot logging • Consider disabling anti-virus scanning for smaller log files What are we looking for? Image from: https://krbtgt.pw/dacl-permissions-overwrite-privilege-escalation- cve-2019-0841/ DACL Permissions Overwrite Privilege Escalation (CVE-2019-0841) by Nabeel Ahmed Paths and Files • PATH NOT FOUND • NAME NOT FOUND Both of these in a user-writable folder indicate you can influence the program. Will wary based on file type and the program handling the files. Image from a vulnerability found by Florian Bogner at bogner.sh: https://bogner.sh/2018/02/local-privilege-escalation-in-crashplans-windows-client/ SetSecurityFile / Permission Overwrite CVE-2019-8452 – Permission Overwrite Hard links to any file • Courtesy of James Forshaw from Google’s Project Zero • Normal mklink tool does not allow hard links to files you don’t have write-access to • ZwSetInformationFile does not enforce that check • CreateHardLinkW does however • Native-HardLink.ps1 from https://github.com/ FuzzySecurity/PowerShell-Suite/blob/master/Native- HardLink.ps1 by @fuzzysec (Ruben Boonen) Unquoted service paths DLL search order hijacking Configuration • Need to have local admin Useful filters • SYSTEM • NAME NOT FOUND / PATH NOT FOUND • SetSecurityFilter (by its own) Exporting for other tools • Exports to CSV and XML • Exporting for XML with stack traces can create *really* big files Exploring in Procmon Hunting in registry • Not seen any potential for abuse • Include SYSTEM user • Exclude starting with HKLM and HKCU AccessEnum .

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