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DETECTION OVERVIEW

Multiple LDAP Auth Errors

Risk Factors

Brute force attacks are low cost and relatively easy to perform. Even though this type of brute force attack is noisy, a successful LDAP brute force attempt can provide the attacker with details about the network environment, queried from Active Directory on an LDAP server, or unauthorized access to any service that accepts the LDAP credentials. Depending on the privilege levels associated with the account, the impact to a business can be significant.

The system might change the risk score for this detection.

Kill Chain

Exploitation

Risk Score

60

Next in Exploitation: NBT-NS Poisoning

Attack Background

An LDAP server contains valuable information about user accounts, administrative accounts, workstations, services, group policy objects, domain trusts, and more. An attacker can target an LDAP server with a brute force attack, which is a method for guessing a weak user password. To guess LDAP passwords, the attacker submits various combinations of usernames and passwords in the initial LDAP authentication request, known as a bind request. Brute force attacks can occur manually through trial and error or with password cracking tools.

Mitigation Options

Limit the number of account login attempts and then block users that exceed this number

Review authentication methods and enforce policies for secure credential creation and multi-factor authentication

MITRE ATT&CK ID

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