About Remote Code Execution – Windows Lightweight Directory Access Protocol (LDAP) (CVE-2024-49112). The vulnerability is from the December Microsoft Patch Tuesday. Three weeks later, on January 1, researchers from SafeBreach released a write-up on this vulnerability, labeled as LDAPNightmare, and an exploit PoC.

The exploit causes a forced reboot of Windows servers. One prerequisite: the victim domain controller’s DNS server must have Internet connectivity.

The attack flow starts with sending a DCE/RPC request to the victim server, causing the LSASS (Local Security Authority Subsystem Service) to crash and force a reboot when an attacker sends a specially crafted CLDAP (Connectionless Lightweight Directory Access Protocol) referral response packet.

But this is all about DoS, why RCE? Researchers note that RCE can be achieved by modifying the CLDAP packet.

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