snort - An open source Network Intrusion Detection System (NIDS)

License: GPL
Snort is an open source network intrusion detection system, capable of
performing real-time traffic analysis and packet logging on IP networks.
It can perform protocol analysis, content searching/matching and can be
used to detect a variety of attacks and probes, such as buffer overflows,
stealth port scans, CGI attacks, SMB probes, OS fingerprinting attempts,
and much more.

Snort has three primary uses. It can be used as a straight packet sniffer
like tcpdump(1), a packet logger (useful for network traffic debugging,
etc), or as a full blown network intrusion detection system.

You MUST edit /etc/snort/snort.conf to configure snort before it will work!

Please see the documentation in /usr/share/doc/snort- for more
information on snort features and configuration.


snort- [5.9 MiB] Changelog by Lawrence R. Rogers (2016-04-26):
- Release

	2016-04-26 Rahul Burman <>
	* src/build.h: updating build number to 383
	*, src/preprocessors/HttpInspect/server/hi_server.c:
	  Modified Http header parsing of multiline content-encoding header.
	* src/preprocessors/: snort_httpinspect.c,
          Fixed an issue where file position pointer was incorrectly set for HTTP response
          containing chunked and gzip data.
        * src/preprocessors/Stream6/: snort_stream_tcp.c
          Added sanity check to TCP trimming in out-of-order FIN case.
        * src/parser.c:
          Disabled port groups that are not useful unless adapative profiling is enabled.
        * src/: dynamic-preprocessors/sdf/spp_sdf.c, obfuscation.c:
          Fixed an issue of incorrect masking of sensitive data.

	2016-03-18 Gaurav Nagare <>
	* src/build.h: updating build number to 335
	* src/dynamic-plugins/: sf_engine/examples/detection_lib_meta.h,
          Updated detection API version to 2.6 to use the latest snort SO rules.
        * src/: dynamic-preprocessors/sdf/spp_sdf.c,
	  preprocessors/Stream6/snort_stream_tcp.c, obfuscation.c:
          Fixed several issues with SDF and obfuscation.
	* src/: profiler.h, preprocessors/perf_indicators.c,
          Resolved snort build issue with "--disable-perfprofiling" configure 
	* src/: decode.c, decode.h: 
          Added Double VLAN tagging support.
	* src/file-process/file_mime_process.c:
          Enhanced mime parsing by adding support for detecting files
          after unknown headers and no headers.
	* src/preprocessors/HttpInspect/server/hi_server.c:
          Fixed memory leak.
        * src/preprocessors/HttpInspect/utils/hi_paf.c:
          Fixed issue with gzip decompression. If the server response specifies
          Content-Encoding as GZIP, but no Content-Length field for HTTP version 1.0.
	* doc/snort_manual.pdf, src/preprocessors/snort_httpinspect.c,
          Fixed Snort memory leak in parsing HTTP xff options.
	* src/preprocessors/spp_httpinspect.c: 
          Fixed Coverity issues.
	* src/preprocessors/: snort_httpinspect.c, snort_httpinspect.h,
	  HttpInspect/include/hi_paf.h, HttpInspect/server/hi_server.c,
          Improved End of Header(EOH) identification for response header spanning multiple
	  reassembled packets.
	* src/preprocessors/: HttpInspect/utils/hi_paf.c,
	  Stream6/snort_stream_tcp.c, Stream6/stream_paf.c:
	  Improved packet reassembly for HTTP, added code to purge segment correctly when 
	  PAF decides to ignore packet upon reaching paf_max.
        * src/fpdetect.c:
          Fixed to use outer header callback functions when checking IP rule against outer IPs 
	  and inner header callback when checking against inner IPs.
        * src/preprocessors/spp_httpinspect.c:
          Fixed an issue where http_inspect current and default config had 
          different file depth.
        * src/dynamic-preprocessors/appid/detector_plugins/detector_dns.c:
          Handled malformed DNS host in AppId.
        * src/file-process/: file_api.h, file_segment_process.c, file_service.c:
          Prevented access to file contexts which are pruned when memcap is 
        * src/dynamic-preprocessors/appid/: app_forecast.c, app_forecast.h,
          flow.h, fw_appid.c, spp_appid.c, thirdparty_appid_types.h:
          Performance improvements to AppID.
        * src/dynamic-preprocessors/appid/luaDetectorApi.c:
          Created a future-flow API for lua detector.
          Exposed DNS API to lua detector.
        * src/dynamic-preprocessors/ftptelnet/pp_ftp.c:
          Fixed an issue where unexpected SSL negotiation starts for FTP
          with explicit SSL.
        * src/preprocessors/HttpInspect/utils/hi_paf.c:
          Updated HTTP PAF to accept all tokens between method and version
          string in request URI.
	* src/preprocessors/HttpInspect/files/file_decomp_SWF.c:
	  Fixed Flash LZMA decompression issue.
	* src/preprocessors/spp_httpinspect.c:
	  Fixed file_depth intialization issue during Snort reload.
snort- [6.0 MiB] Changelog by Lawrence R. Rogers (2015-11-17):
- Release
	[*] New additions
	 *  SMBv2/SMBv3 support for file inspection.
	 *  Port override for metadata service in IPS rules.
	 *  AppID Lua detector performance profiling.
	 *  Perfmon dumps stats at fixed intervals from absolute time.
	 *  New preprocessor alert (120:18) to detect SSH tunneling over HTTP
	 *  New config option |disable_replace| to disable replace rule option.
	 *  New Stream configuration |log_asymmetric_traffic| to control logging to syslog.
	 *  New shell script in tools to create simple Lua detectors for AppID.
	[*] Improvements
	 *  sfip_t refactored to use struct in6_addr for all ip addresses.
	 *  Post-detection callback for preprocessors.
	 *  AppID support for multiple server/client detectors evaluating on same flow.
	 *  AppID API for DNS packets.
	 *  Memory optimizations throughout.
	 *  Support sending UDP active responses.
	 *  Fix perfmon tracking of pruned packets.
	 *  Stability improvements for AppID.
	 *  Stability improvements for Stream6 preprocessor.
	 *  Added improved support to block malware in FTP preprocessor.
	 *  Added support to differentiate between active and passive FTP connections.
	 *  Improvements done in Stream6 preprocessor to avoid having duplicate packets 
	    in the DAQ retry queue.
	 *  Resolved an issue where reputation config incorrectly displayed 'blacklist' in
	    priority field even though 'whitelist' option was configured.
	 *  Added support for multiple expected sessions created per packet
	 *  Active response now supports MPLS

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