CTD-000138

Resource-based constrained delegation on domain controllers

High
Active Directory
Defense Evasion Lateral Movement Privilege Escalation
v14

Signature Identity

CTD-000138
Threat ID
14
Version
IOE
Indicator Type

Threat Description

Modifying the msDS-AllowedToActOnBehalfOfOtherIdentity attribute can have security implications. So, it’s important to refrain from assigning tasks to privileged resources like DCS. Resource-based constrained delegation is configured on the target resource, unlike other delegation types configured on the accounts accessing the resource.

When a threat actor gains control over a service account, the potential for exploitation of improperly configured Resource-Based Constrained Delegation (RBCD) settings is significant. These misconfigurations can be leveraged to delegate credentials from a lower-privileged account to a higher-privileged resource, thereby escalating their privileges.

Configuring RBCD on domain controllers allows specific accounts to impersonate other users when accessing particular resources. This approach gives administrators granular control over delegation permissions, focusing on the resources rather than the service accounts. However, if misconfigured, RBCD can be a significant security risk.

MITRE ATT&CK: Attack Tactics

Defense Evasion Lateral Movement Privilege Escalation

D3FEND: Defend Tactics

Credential Hardening

Remediation

To clean up the msDS-AllowedToActOnBehalfOfOtherIdentity attribute, use the following PowerShell code:

Import-Module ActiveDirectory
# Replace this with the distinguished name (DN) of the target object
$targetObject = 'CN=computer,DC=test,DC=com'
# Clear the attribute
Set-ADObject -Identity $targetObject -Clear msDS-AllowedToActOnBehalfOfOtherIdentity

Frequently Asked Questions

What does Resource-based constrained delegation on domain controllers mean?

Resource-based constrained delegation on domain controllers is a configuration that enables specific accounts to assume the identity of other users when accessing particular resources, based on the resource's permissions. This approach allows administrators to control delegation at a granular level, focusing on the resources rather than the service accounts.

Resource-based constrained delegation on domain controllers is rated high severity because misconfigured RBCD settings can be exploited to delegate credentials from a lower-privileged account to a higher-privileged resource, resulting in privilege escalation. This security risk allows attackers to assume the identity of users and access sensitive resources.

When RBCD is misconfigured on domain controllers, an attacker can gain control over a service account and exploit the improperly configured settings. This allows them to delegate credentials from a lower-privileged account to a higher-privileged resource, enabling privilege escalation and access to sensitive resources through user impersonation.

Cayosoft Guardian detects Resource-based constrained delegation on domain controllers by continuously monitoring the configuration of RBCD settings across the Active Directory environment domain. When misconfigured settings are found, Guardian flags them as a security issue so administrators can take corrective action to prevent unauthorized access.

Cayosoft Guardian helps reduce the risk of Resource-based constrained delegation on domain controllers by providing visibility into misconfigured RBCD settings, allowing teams to review and correct the configuration. This prevents attackers from exploiting the vulnerability and escalating privileges through user impersonation.

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Classification
Systems
Active Directory
Themes
Kerberos
Attack Tactics
Defense Evasion Lateral Movement Privilege Escalation
Defend Tactics
Credential Hardening
Indicator Types
IOE
Related Threats
CTD-000139
Kerberos Constrained Delegation: krbtgt Risks
Critical
CTD-000122
Active Directory Schema Update Permission Risks
Critical