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| Subject: | [Snort-sigs] Proposed improvement for SID 553 |
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| Date: | Mon, 21 Mar 2005 16:11:21 -0600 |
Greetings, it seems that SID 553 (POLICY FTP anonymous login attempt) falses easily on user names like ftp-blahuser. The sig currently reads: alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"POLICY FTP anonymous login attempt"; flow:to_server,established; content:"USER"; nocase; pcre:"/^USER\s+(anonymous|ftp)/smi"; classtype:misc-activity; sid:553; rev:7;) I propose to change it to: alert tcp $EXTERNAL_NET any -> $HOME_NET 21 (msg:"POLICY FTP anonymous login attempt"; flow:to_server,established; content:"USER"; nocase; pcre:"/^USER\s+(anonymous|ftp)(\x0d|\x0a)/smi"; classtype:misc-activity; sid:553; rev:7;) Alternatively, a check for word boundary on (anonymous|ftp) might work too. Regards, Frank
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