Kerberos

A null pointer dereference vulnerability (CVE-2026-60109) exists in Zeek's Kerberos protocol analyzer before version 8.0.9, allowing unauthenticated remote attackers to crash a Zeek sensor by sending a specially crafted KRB_ERROR message with error-code 25 and specific PA-DATA elements, leading to a denial-of-service condition.

A path traversal vulnerability (CVE-2026-14476) in SSSD's Active Directory Group Policy Object (AD GPO) provider allows an authenticated attacker with AD GPO management access to write arbitrary files outside the GPO cache directory with root privileges, leading to Kerberos configuration injection and potential authentication bypass on Red Hat Enterprise Linux systems.

The rule detects a local successful logon event with Kerberos authentication from localhost, followed by service creation from the same LogonId, indicating a potential Kerberos relay attack for local privilege escalation to LocalSystem.

Detects suspicious DNS queries containing a base64-encoded blob, indicating potential Kerberos coercion attacks and SPN spoofing via DNS to coerce authentication to attacker-controlled hosts, enabling Kerberos or NTLM relay attacks.

CVE-2026-27912 describes an improper authorization vulnerability in Windows Kerberos, enabling an attacker on an adjacent network with valid credentials to elevate privileges.

An attacker exploits CVE-2026-20929 by manipulating DNS responses to redirect Kerberos authentication to attacker-controlled AD CS, enabling certificate enrollment for persistent access.

An anonymous, remote attacker can exploit a vulnerability in MIT Kerberos to bypass security measures.

Detection of Kerberos pre-authentication being disabled for a user account, potentially leading to AS-REP roasting and offline password cracking by attackers with GenericWrite or GenericAll rights over the account.

Detection of PowerShell scripts attempting to dump Kerberos tickets from memory by accessing LSA authentication packages, potentially leading to credential access and lateral movement.

Adversaries may abuse MicrosoftDNS records containing a base64-encoded blob to coerce victim systems into authenticating to attacker-controlled hosts while requesting Kerberos tickets for legitimate services, detected via directory-service access events.

Detects potential Kerberos relay attacks by identifying coercion attempts followed by authentication events using a target server's computer account, originating from a different host, indicating an attacker has captured and relayed Kerberos authentication material to execute code on behalf of the compromised system.

The creation of .kirbi files on Windows systems indicates potential Kerberos ticket dumping using tools like Mimikatz, preceding Pass-The-Ticket attacks.

Detection of the Kerberos pre-authentication flag being disabled in a user account via Windows Security Event 4738, enabling AS-REP Roasting attacks for offline password brute-forcing.

This brief details the detection of DNS-based Kerberos coercion attacks, where adversaries inject marshaled credential structures into DNS records to spoof SPNs and redirect authentication, as seen in CVE-2025-33073, using Suricata and Sysmon event ID 22.

Detects the creation of .kirbi files, a suspicious Kerberos ticket artifact often produced by ticket export or dumping tools such as Rubeus or Mimikatz, indicating preparation for Kerberos ticket theft or Pass-The-Ticket (PTT) attacks.