Re: [Snort-users] snort ftp preprocessor alerts on port 2100 ??

Hi Russell--

This certainly seems strange, given the configuration you
provide below... Any chance you can provide a pcap from
the packet that generated the alert?

I'm wondering if there is a presentation issue in the
post-processing software you are using.

Cheers.
-steve

Russell Fulton wrote:
> HI
>
> I'm seeing ftp preprocessor alerts from traffic on port 2100 and I  
> can't see why.
>
>  From snort conf:
>
> preprocessor ftp_telnet_protocol: ftp server default \
>    ports { 21 } \
>    def_max_param_len 100 \
>    ftp_cmds { USER PASS ACCT CWD CDUP SMNT \
>      QUIT REIN PORT PASV TYPE STRU MODE RETR STOR STOU APPE ALLO REST \
>      RNFR RNTO ABOR DELE RMD MKD PWD LIST NLST SITE SYST STAT HELP  
> NOOP } \
>    ftp_cmds { AUTH ADAT PROT PBSZ CONF ENC } \
>    ftp_cmds { FEAT OPTS } \
>    ftp_cmds { MDTM REST SIZE MLST MLSD EPSV } \
>    alt_max_param_len 0 { CDUP QUIT REIN PASV STOU ABOR PWD SYST NOOP } \
>    cmd_validity MODE < char ASBCZ > \
>    cmd_validity STRU < char FRP > \
>    cmd_validity ALLO < int [ char R int ] > \
>    cmd_validity TYPE < { char AE [ char NTC ] | char I | char L  
> [ number ] } > \
>    cmd_validity PORT < host_port >
>
> Which clearly says port 21.
>
> Yet I see:
>
> META  
> SID   CID     TimeStamp       Signature       Sig ID
> 1     5823276 2008-07-08 13:53:23     ftp_pp: Invalid FTP command     2
> Sensor Hostname       Sensor Interface
> monitor-itss.insec.auckland.ac.nz     ITSS sector switch
> IP    
> Source Address        Dest Address    Ver     Hdr Len TOS     length  ID      
> flags   offset  TTL      
> chksum
> 130.216.138.211       130.216.123.59  4       5       0       172     16279   
> 2       0       127     45045
> Resolved Source       Resolved Dest
> macula.opt.auckland.ac.nz     tamexam8.opt.auckland.ac.nz
> TCP   
> Source Port   Dest Port       Seq     Ack     Offset  Reserved        Flags   
> Window  Checksum         
> Urgent Ptr
> 1158  2100    2491263236      988172587       5       0       24      65211   
> 58408   0
> Options
> None
> Flags
> RB 1  RB 0    URG     ACK     PSH     RST     SYN     FIN
>
>
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