'IPS'에 해당되는 글 8건

  1. 2013.07.18 시스코 IPS 서비스 거부 취약점 보안 업데이트
  2. 2011.04.08 Snort is available for download!
  3. 2011.01.14 Fwsnort: Application layer IDS/IPS with iptables
2013. 7. 18. 19:18

시스코 IPS 서비스 거부 취약점 보안 업데이트

□ 개요
  o CISCO社는 ISP(Intrusion Prevention System)에 영향을 주는 서비스 거부 취약점을 해결한 보안 업데이트를 발표
    - (CVE-2013-1243, CVE-2013-1218, CVE-2013-3410, CVE-2013-3411)
  o 공격자는 특수하게 조작된 패킷을 전송하여, 취약점에 영향받는 장비를 대상으로 장애를 유발시킬 수 있으므로, 
     최신버전으로 업데이트 권고

□ 해당 시스템
   o 영향 받는 제품
    - Cisco ASA 5500-X Series 
    - Cisco IPS 4500 Series 
    - Cisco IPS 4300
    - Cisco Intrusion Prevention System Network Module Enhanced (IPS NME)
    - Cisco Catalyst 6500 Series Intrusion Detection System (IDSM-2) Module

□ 해결방안
   o 취약한 제품의 운영자는 유지보수 업체를 통하여 패치 적용

□ 기타 문의사항
   o 시스코코리아 : 080-808-8082
   o 한국인터넷진흥원 인터넷침해대응센터: 국번없이 118

[1] http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130717-ips

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2011. 4. 8. 09:46

Snort is available for download!

This is the changelog for Snort

  * src/build.h:
      Increment Snort build number to 134
  * src/: decode.h, encode.c:
  * src/dynamic-plugins/sf_engine/: sf_snort_packet.h:
  * src/preprocessors/: spp_sfportscan.c, spp_frag3.c:
  * src/output-plugins/: spo_alert_fast.c:
  * src/preprocessors/Stream5/: stream5_common.c:
      Updated portscan to set protocol correctly in raw packet for
      IPv6 and changed the encoder to recognize portscan packets as pseudo
 packets so that the checksum isn't calculated
  * src/: sfdaq.c, util.c:
      Improve handling of DAQ failure codes when Snort is shutting down.
  * src/preprocessors/spp_perfmonitor.c:
      Update perfmonitor to create now files prior to dropping privs
  * src/build.h:
      Increment Snort build number to 132
  * src/snort.c:
  * src/preprocessors/: normalize.c, perf-base.c, perf-base.h,
      TCP timestamp options are only NOPed by the Normalization preprocessor
      if Stream5 has seen a full 3-way handshake, and timestamps weren't

      The IPS mode reassembly policy has been refactored to do stream
      normalization within the first policy.

      Packets injected by the normalization preprocessor are now counted
      in the packet statistics.
  * doc/snort_manual.tex:
  * src/: parser.c, parser.h:
  * src/preprocessors/: spp_frag3.c, Stream5/snort_stream5_session.c:
      Added a "config vlan_agnostic" setting that globally disables Stream's
      use of vlan tag in session tracking.
  * src/: snort.c, preprocessors/normalize.c,
    preprocessors/spp_normalize.c, preprocessors/spp_normalize.h,
    preprocessors/perf-base.c, preprocessors/perf-base.h:
  * doc/: README.normalize, snort_manual.pdf, snort_manual.tex:
      Fixed the normalization preprocessor to call its post-initialization
      config functions during a policy reload.

      Packets can no longer be trimmed below the minimum ethernet frame
      length. Trimming is now configurable with the "normalize_ip4: trim;"
      option. TOS clearing is now configurable with "normalize_ip4: tos;".

      The "normalize_ip4: trim" option is automatically disabled if the
      DAQ can't inject packets. If the DAQ tries and fails to inject
      a given packet, the wire packet is not blocked.

      Updated documentation regarding these changes.
  * src/detection-plugins/sp_cvs.c:
      Fixed a false positive in the CVS detection plugin. It was incorrectly
      parsing CVS entries that had a '+' in between the 3rd and 4th slashes.
  * src/preprocessors/HttpInspect/: client/hi_client.c,
      Changed a pointer comparison to a size check for code readability.
      Belated thanks to Dwane Atkins and Parker Crook for reporting a
      related issue that was fixed in Snort build 111.

      Moved the zlib initialization such that gzipped responses are still
      inspected if the zipped data starts after the first Stream-reassembled
      packet is inspected.
  * src/decode.c:
      Fixed an issue with decoding too many IP layers in a single packet. The
      Teredo proto bit was not unset after hitting the limit on IP layers.
      Thanks to Dwane Atkins for reporting this issue.

      IPv6 fragmented packets are no longer inspected unless they have an
      offset of zero and the next layer is UDP. This behavior is consistent
      with IPv4 decoding.
      Thanks to Martin Schütte for reporting an issue where fragged ICMPv6
      packets were being inspected.

      The decoder no longer attempts to decode Teredo packets inside of
      IPv4 fragments, instead waiting for the reassembled packet.
  * src/encode.c:
      Fixed a problem where encoded packets had their lengths calculated
      incorrectly. This caused the active response feature to generate
      incorrect RST packets if the original packet had a VLAN tag.
  * preproc_rules/preprocessor.rules:
      Updated references to rule 125:1:1
  * src/preprocessors/spp_perfmonitor.c:
      Perfmonitor files are now created after Snort changes uid/gid.
  * src/dynamic-plugins/sf_preproc_example/sf_dynamic_preproc_lib.c:
      Fixed the size formatting of an error message argument when
      compiling with --enable-rzb-saac.
      Thanks to Cleber S. Brandão for reporting this issue.
  * etc/snort.conf:
      Updated the default snort.conf with max compress and decompress
      depths to enable unlimited decompression of gzipped HTTP responses.
  * snort.8:
      Fixed the man page's URL regarding the location of Snort rules.
      Thanks to Michael Scheidell for reporting an out-of-date man page section.
  * doc/README.http_inspect, doc/snort_manual.tex,
      HTTP Inspect's "unlimited_decompress" option now requires that
      "compress_depth" and "decompress_depth" are set to their max values.
  * src/: fpcreate.c, dynamic-plugins/sf_dynamic_define.h,
      Fixed an error that prevented compiling with --disable-dynamicplugin.
      Thanks to Jason Wallace for reporting this issue.
  * src/dynamic-preprocessors/ftptelnet/: snort_ftptelnet.c,
    snort_ftptelnet.h, spp_ftptelnet.c:
      Changed the names of ProcessGlobalConf() and PrintGlobalConf() inside
      the ftp_telnet preprocessor to avoid a naming conflict with similar
      functions in HTTP Inspect.
      Thanks to Bruce Corwin for reporting this issue.
  * src/preprocessors/: perf.c, perf-base.c, perf-base.h, perf-flow.c,
      Fixed comparisons between signed and unsigned int, which lead to
      a faulty length check.
      Thanks to Cihan Ayyildiz and Jason Wallace for helping us debug this

Download Snort v2.9.0.5 (snort- here.

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2011. 1. 14. 02:13

Fwsnort: Application layer IDS/IPS with iptables

Fwsnort parses the rules files included in the Snort intrusion detection system and builds an equivalent iptables ruleset for as many rules as possible.

Fwsnort utilizes the iptables string match module (together with a custom patch that adds a --hex-string option to the iptables user space code which is now integrated with iptables) to detect application level attacks.
Fwsnort 1.5 now is available for download. This is a major release that moves to using the iptables-save format for instantiating the fwsnort policy, and this allows the run time for adding the fwsnort policy to the kernel to be drastically reduced.

Fwsnort now splices in the translated Snort rules into the iptables policy in the running kernel at the time of translation. So, any updates to the iptables policy that are made after fwsnort is executed and before fwsnort.sh is run would be lost. Hence, it is advisable to execute fwsnort.sh soon after running fwsnort.

This is a reasonable tradeoff though considering the performance benefit as seen below - which gives an example of how long it takes to add an fwsnort iptables policy via the old strategy of executing one iptables command at a time vs. implementing the same policy with iptables-restore.

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