[Snort-users] Snort SIP Preprocessor error

Jesse Whyte jesse.whyte at ...15772...
Wed Aug 22 12:13:44 EDT 2012


List members,

I've successfully compiled snort 2.9.3.1 on an Ubuntu 12.04 box running
kernel version 3.2.0-29.  I'm trying to hand-compile from source rather
than use the packaged version.  The configure appears to execute
successfully, as does the make.  After configuring oinkmaster and running
snort with generic rules, I'm encountering the following strange error:

Running in IDS mode

        --== Initializing Snort ==--
Initializing Output Plugins!
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file "/etc/snort/snort.conf"
PortVar 'HTTP_PORTS' defined :  [ 80:81 311 591 593 901 1220 1414 1830 2301
2381 2809 3128 3702 5250 7001 7777 7779 8000 8008 8028 8080 8088 8118 8123
8180:8181 8243 8280 8888 9
090:9091 9443 9999 11371 ]
PortVar 'SHELLCODE_PORTS' defined :  [ 0:79 81:65535 ]
PortVar 'ORACLE_PORTS' defined :  [ 1024:65535 ]
PortVar 'SSH_PORTS' defined :  [ 22 ]
PortVar 'FTP_PORTS' defined :  [ 21 2100 3535 ]
PortVar 'SIP_PORTS' defined :  [ 5060:5061 5600 ]
Detection:
   Search-Method = AC-Full-Q
    Split Any/Any group = enabled
    Search-Method-Optimizations = enabled
    Maximum pattern length = 20
Tagged Packet Limit: 256
Loading dynamic engine /usr/lib/snort_dynamicengine/libsf_engine.so... done
Loading all dynamic preprocessor libs from
/usr/lib/snort_dynamicpreprocessor/...
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_modbus_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_reputation_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_pop_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_dnp3_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_ssl_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_sdf_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_dce2_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_gtp_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_ssh_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_imap_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_smtp_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_dns_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_ftptelnet_preproc.so... done
  Loading dynamic preprocessor library
/usr/lib/snort_dynamicpreprocessor//libsf_sip_preproc.so... done
  Finished Loading all dynamic preprocessor libs from
/usr/lib/snort_dynamicpreprocessor/
Log directory = /var/log/snort
WARNING: ip4 normalizations disabled because not inline.
WARNING: tcp normalizations disabled because not inline.
WARNING: icmp4 normalizations disabled because not inline.
WARNING: ip6 normalizations disabled because not inline.
WARNING: icmp6 normalizations disabled because not inline.
Frag3 global config:
    Max frags: 65536
    Fragment memory cap: 4194304 bytes
Frag3 engine config:
    Bound Address: default
    Target-based policy: WINDOWS
    Fragment timeout: 180 seconds
    Fragment min_ttl:   1
    Fragment Anomalies: Alert
    Overlap Limit:     10
    Min fragment Length:     100
Stream5 global config:
    Track TCP sessions: ACTIVE
    Max TCP sessions: 262144
    Memcap (for reassembly packet storage): 8388608
    Track UDP sessions: ACTIVE
    Max UDP sessions: 131072
    Track ICMP sessions: INACTIVE
    Track IP sessions: INACTIVE
    Log info if session memory consumption exceeds 1048576
    Send up to 2 active responses
    Wait at least 5 seconds between responses
    Protocol Aware Flushing: ACTIVE
        Maximum Flush Point: 16384
Stream5 TCP Policy config:
    Bound Address: default
    Reassembly Policy: WINDOWS
    Timeout: 180 seconds
    Limit on TCP Overlaps: 10
    Maximum number of bytes to queue per session: 1048576
    Maximum number of segs to queue per session: 2621
    Options:
        Require 3-Way Handshake: YES
        3-Way Handshake Timeout: 180
        Detect Anomalies: YES
    Reassembly Ports:
      21 client (Footprint)
      22 client (Footprint)
      23 client (Footprint)
      25 client (Footprint)
      42 client (Footprint)
      53 client (Footprint)
      79 client (Footprint)
      80 client (Footprint) server (Footprint)
      81 client (Footprint) server (Footprint)
      109 client (Footprint)
      110 client (Footprint)
      111 client (Footprint)
      113 client (Footprint)
      119 client (Footprint)
      135 client (Footprint)
      136 client (Footprint)
      137 client (Footprint)
      139 client (Footprint)
      143 client (Footprint)
      161 client (Footprint)
      additional ports configured but not printed.
Stream5 UDP Policy config:
    Timeout: 180 seconds
HttpInspect Config:
    GLOBAL CONFIG
      Max Pipeline Requests:    0
      Inspection Type:          STATELESS
      Detect Proxy Usage:       NO
      IIS Unicode Map Filename: /etc/snort/unicode.map
      IIS Unicode Map Codepage: 1252
      Memcap used for logging URI and Hostname: 150994944
      Max Gzip Memory: 838860
      Max Gzip Sessions: 9532
      Gzip Compress Depth: 65535
      Gzip Decompress Depth: 65535
    DEFAULT SERVER CONFIG:
      Server profile: All
      Ports (PAF): 80 81 311 591 593 901 1220 1414 1830 2301 2381 2809 3128
3702 5250 7001 7777 7779 8000 8008 8028 8080 8088 8118 8123 8180 8181 8243
8280 8888 9090 9091 9443 9999 11371
      Server Flow Depth: 0
      Client Flow Depth: 0
      Max Chunk Length: 500000
      Max Header Field Length: 750
      Max Number Header Fields: 100
      Max Number of WhiteSpaces allowed with header folding: 200
      Inspect Pipeline Requests: YES
      URI Discovery Strict Mode: NO
      Allow Proxy Usage: NO
      Disable Alerting: NO
      Oversize Dir Length: 500
      Only inspect URI: NO
      Normalize HTTP Headers: NO
      Inspect HTTP Cookies: YES
      Inspect HTTP Responses: YES
      Extract Gzip from responses: YES
      Unlimited decompression of gzip data from responses: YES
      Normalize Javascripts in HTTP Responses: NO
      Normalize HTTP Cookies: NO
      Enable XFF and True Client IP: NO
      Log HTTP URI data: NO
      Log HTTP Hostname data: NO
      Extended ASCII code support in URI: NO
      Ascii: YES alert: NO
      Double Decoding: YES alert: NO
      %U Encoding: YES alert: YES
      Bare Byte: YES alert: NO
      UTF 8: YES alert: NO
      IIS Unicode: YES alert: NO
      Multiple Slash: YES alert: NO
      IIS Backslash: YES alert: NO
      Directory Traversal: YES alert: NO
      Web Root Traversal: YES alert: NO
      Apache WhiteSpace: YES alert: NO
      IIS Delimiter: YES alert: NO
      IIS Unicode Map: GLOBAL IIS UNICODE MAP CONFIG
      Non-RFC Compliant Characters: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07
      Whitespace Characters: 0x09 0x0b 0x0c 0x0d
rpc_decode arguments:
    Ports to decode RPC on: 111 32770 32771 32772 32773 32774 32775 32776
32777 32778 32779
    alert_fragments: INACTIVE
    alert_large_fragments: INACTIVE
    alert_incomplete: INACTIVE
    alert_multiple_requests: INACTIVE
ERROR size 440 != 432
ERROR: Failed to initialize dynamic preprocessor: SF_SIP (IPV6) version
1.1.1 (-2)
Fatal Error, Quitting..

Everything looks fairly normal.  The snort.conf file is basically stock.
 As a first step in trying to isolate the problem, I disabled the sip
preprocessor with the following lines in the config file:

# SIP Session Initiation Protocol preprocessor.  For more information see
README.sip
preprocessor sip: max_sessions 10000, \
   disabled
#   ports { 5060 5061 5600 }, \
#   methods { invite \
#             cancel \
#             ack \
#             bye \
#             register \
#             options \
#             refer \
#             subscribe \
#             update \
#             join \
#             info \
#             message \
#             notify \
#             benotify \
#             do \
#             qauth \
#             sprack \
#             publish \
#             service \
#             unsubscribe \
#             prack }, \
#   max_uri_len 512, \
#   max_call_id_len 80, \
#   max_requestName_len 20, \
#   max_from_len 256, \
#   max_to_len 256, \
#   max_via_len 1024, \
#   max_contact_len 512, \
#   max_content_len 1024

(Whereas previously, I had the standard preprocessor config.)  Disabling
the processor as above did not change the snort output.  There does not
seem to be anything in the configure output that seems to indicate problems
with SIP.  Can anyone offer any insight into this issue?

Many thanks,

Jesse Whyte
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