CISA Advisory: Hackers Breach U.S. Federal Agency Network via GeoServer RCE (CVE-2024-36401) in 3-Week Undetected Attack

CISA's advisory reveals threat actors compromised a U.S. federal agency's network using CVE-2024-36401, a critical GeoServer RCE flaw via eval injection (CWE-95), undetected for three weeks. The breach started July 11, 2024, on a public instance, added to KEV July 15 despite June 30 disclosure; a second hit July 24 used Burp Suite, fscan, and linux-exploit-suggester2.pl for recon.


Actors persisted with China Chopper webshells, cron jobs, and dirtycow (CVE-2016-5195) escalation, deploying RingQ evasion and Stowaway C2 on ports 4441/50012. They moved laterally to web and SQL servers, uploading shells/scripts, running discovery (whoami, systeminfo), enabling cmdshell, and downloading via PowerShell/bitsadmin—exploiting unprotected web servers.


EDR detected a suspicious 1.txt file July 31, after ignoring a July 15 Stowaway alert. Lessons: Patch KEV vulns immediately, improve IR for third-party access, and monitor EDR continuously. The incident exposes federal gaps in vuln management and response.
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