The root cause analysis of a recent security incident reveals that an attacker accessed a printer from the Internet. The attacker then accessed the print server, using the printer as a launch pad…

The DoS against the domain controller was the final outcome, not the enabling technique; mitigating DDoS defenses does not address the privilege escalation chain that made the attack possible.

A SYN flood is one specific DoS mechanism, but there is no evidence it was used, and addressing SYN floods would not prevent the lateral movement and privilege escalation that drove the incident.

A shell exploit (possibly involving a buffer overflow) was one technique used against the print server, but the overarching multi-stage attack pattern across all steps was privilege escalation.

Privilege escalation is the technique of gaining access rights beyond what was originally granted, and the attacker exploited this at every stage: compromising the printer to reach the print server, leveraging the print server to exploit multiple accounts, and ultimately gaining sufficient privilege to launch a DoS against the domain controller. Mitigation through least privilege enforcement, account segmentation, and prompt patching would have broken the attack chain at multiple steps.