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Engineers currently deploy sensors to collect full content data These sensors run Tcpdump or an equivalent application to observe packets and write their contents to disk Information saved to the hard drive can be inspected in one of several ways First, analysts may access the sensor directly, perhaps using OpenSSH They inspect libpcap traces stored on the remote sensors, typically using Tcpdump They may extract packets of interest by invoking Tcpdump a second time with an appropriate BPF To save those packets, the analysts copy the libpcap excerpts to their local workstations using SCP A second way to inspect full content packet data is to copy packets of interest from the sensor to an analyst's workstation in response to the analyst's query This is the method chosen by Sguil When an analyst requests a transcript or Ethereal decode, Sguil uses Tcpdump on the remote sensor to locate packets of interest and SCP to copy them to the local workstation A third and more limited way to see some full content data is demonstrated by Snort's unified output, where one can send the packet that triggered an alert to a database Upon querying the database, the analyst sees only the packet associated with the alert Sguil uses this method to show packet data for individual alerts in its main alert panel As analysts, engineers, and managers come to realize the value of full content data, they are clamoring for greater access to raw packets Switched networks and high-traffic loads conspire to keep packet contents out of their hands Developers debate the necessity of accessing such data and the difficulties associated with its collection and retention In November 2000 and March 2001, Carter Bullard (author of Argus) published Informational Internet Drafts on "Remote Packet Capture" Bullard claimed, "Packet capture is a fundamental mechanism in Internet network management and is used in support of a wide range of network operational functions, such as fault detection, protocol functional assurance, performance analysis, and security assessment" His proposal exceeded capabilities offered via RMON (RFC 2819, or Internet Standard 59) and SMON (RFC 2613), recognizing that switched networks are ubiquitous and sometimes full content data is the only evidence suitable for illuminating difficult network security and management problems
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See the full text, from which this quote was taken, at http://wwwwaterspringsorg/pub/id/draft-bullard-pcap-00txt and http://wwwwaterspringsorg/pub/id/draft-bullard-pcap-01txt
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Several developers of open source tools are working to implement remote packet capture Currently the Windows port of libpcap , called Winpcap, offers experimental remote capture capabilities The implementation consists of a daemon on the remote system for capturing packets and a client on a local system for inspecting them RPCAP, the Remote Packet Capture system, can be found at http://rpcapsourceforgenet, although development seems to have stalled
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In the future I expect to see increased support in the open source world for collecting traffic remotely and seamlessly presenting it to a local workstation Analysts of all sorts are realizing that alert data is insufficient when investigating security and network performance issues Alert data will be increasingly supplemented by full content data and hopefully session data These additional sources of information will help analysts validate or reject conclusions reached by alert generation products like IDSs and network health monitors
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The idea of comparing attack data to information on target vulnerabilities is not new Developers always seek to improve the accuracy of their intrusion detection products One way to accomplish this goal is to give the IDS more information about its environment If an IDS knows a target runs the Apache Web server, for example, the target should not be exploited by a Microsoft IIS exploit Developers have created three models for providing the IDS with this contextual information First, Marty Roesch, the lead developer of Snort and the first person to use the term "contextual" in this field, believes in a model that relies on passive collection of network traffic Marty's company, Sourcefire, is fielding a product called Real-time Network Awareness, or RNA RNA builds a profile of the organization it monitors and feeds data on the target environment to Sourcefire's IDS By giving the Sourcefire IDS knowledge of the operating system and applications it sees active on the network, RNA seeks to eliminate nontextuals "Nontextual" is a term Marty coined to describe alerts that are correctly detected by an IDS but have no chance of compromising a victim An IIS exploit fired against an Apache Web server is the canonical example Tenable Security's NeVO passive scanner is a related implementation of the passive assessment and IDS augmentation concept
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An October 2003 thread on the Focus-IDS mailing list discusses Marty Roesch's thinking: http://wwwderkeilercom/Mailing-Lists/securityfocus/focus-ids/2003-10/0085html
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A second model for giving IDSs additional environmental data involves proactively scanning potential targets Proventia products by Internet Security Systems (ISS) take this approach An active scanner component performs reconnaissance of the target environment and feeds operating system and application details to ISS's Site Protector and Fusion consoles Active scanners have a longer development history than passive scanners and are usually more accurate Active scanners possessing the credentials (usernames and passwords) needed to interact with targets, like Windows hosts, can obtain much richer data on target vulnerabilities The downside to the active scanner approach is twofold First, many organizations fear active scanners will disable critical hosts with weak TCP/IP stacks or applications Second, proactive scanning data is only as accurate as the time of the last scan While continuous scanning decreases the amount of time between refreshes of target data, the technique introduces additional and probably unnecessary traffic
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I believe that any operating system or application that cannot withstand proactive reconnaissance is a strong candidate for replacement or at least upgrade
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The third model for integrating vulnerability assessment information to improve detection accuracy involves post-attack alert verification Products like Cisco Threat Response (CTR) scan targets for vulnerabilities indicated by Cisco's IDS If the Cisco IDS sees a Microsoft IIS attack against a target, CTR reactively scans that target for the indicated vulnerability CTR feeds scan results back to the Cisco IDS, which presents an integrated alert to the analyst This method is a cross between the first two integration techniques As an active scanning technique, it is potentially more accurate than passive interpretation of network traffic As an on-demand system, CTR eliminates the need for continuous scanning of all targets Engineers can also deploy CTR to collect information from exploited targets Although Cisco advertises this as a "forensic" feature, the forensic community has not yet assessed the soundness of Cisco's approach and the reliability of the data CTR gathers All three of these techniques show promise It is likely that hybrid techniques will take advantage of the best aspects of each system Already Tenable's NeVO product performs both active and passive scanning The open source community is experimenting with some of these approaches In 2003 William Robertson of the Reliable Software Group at the University of California, Santa Barbara, began a Snort alert verification project ( http://wwwcsucsbedu/~wkr/projects/ids_alert_verification/) His code implemented the CTR model of verifying alerts in response to specific attacks We've already seen open source projects like P0f for passively fingerprinting operating systems With tools for actively identifying applications like THC's Amap now in use, expect to see passive identification products arise from the open source world