The ESC16 vulnerability in Active Directory Certificate Services enables attackers to bypass certificate validation and escalate privileges, potentially leading to full domain compromise. Immediate mitigation is essential to safeguard your Microsoft PKI and prevent unauthorized access. #ADCS #ESC16Vulnerability
Keypoints
- The ESC16 attack exploits weaknesses in certificate extension controls and UPN handling in AD CS.
- Attackers can manipulate permissions to impersonate privileged accounts and use shadow credentials for persistence.
- The vulnerability allows requesting certificates with bypassed restrictions, facilitating lateral movement and privilege escalation.
- Mitigation involves adjusting registry settings, restricting write permissions, and patching AD CS systems.
- Tools like certipy-ad and Evil-WinRM are used to enumerate vulnerabilities and establish domain control.
Read More: https://www.hackingarticles.in/adcs-esc16-security-extension-disabled-on-ca-globally/