Microsoft IIS FTP Vulnerability - bad detection
Summary: Cisco Talos reported that detection rules for the Microsoft IIS FTP stack overflow were targeting the wrong command, flagging SITE when the actual flaw is in NLST parsing long directory names. Talos noted the released exploit uses SITE only to store shellcode in memory for later egghunting, so other shellcode-storage methods would evade SITE-based detection, and it also flagged rules that skip fast-fail checks like isdataat, adding cumulative engine load.
Key Takeaway: A detection rule built around one published exploit's SITE command catches that sample and nothing else, leaving any attacker who stores shellcode another way invisible to your sensors.
Read the original at Cisco Talos ↗
- Topics
- Detection & Response
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