Denmark's CERT (SektorCERT) reported that 22 companies that operate parts of Danish energy infrastructure were compromised in a May 2023 coordinated attack, linked to SANDWORM actors. Sandworm is a state-sponsored APT publicly attributed to Russian General Staff Main Intelligence Directorate’s Russian (GRU’s) Main Centre for Special Technologies (GTsST) by the U.S. government. The attackers leveraged a Zyxel vulnerability CVE-2023-28771 (9.8 critical) to gain control of the firewall. SektorCERT's incident response report includes a detailed analysis and timeline of the attack, recommendations and IOC. Link:https://media.licdn.com/dms/document/media/D4D1FAQG-Qsry8BH9dg/feedshare-document-pdf-analyzed/0/1699785104486?e=1700697600&v=beta&t=icNMQ-rDYgeSojoaax-1KpC7YrCF7MVtkrDClSFiKIY
Lost my toot on it from last month, but I recommend you patch any #Zyxel Zywall devices for CVE-2023-28771 - it's super exploitable, pre-auth and facing to internet by design. #CVE202328771#vulnerabilities