uinetd is a very simple and small UDP packet forwarder. It is ideal for NAT networks.
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Reap scans any number of IP's for vulnerable CGIs, misc. daemons and a few other remote exploits, while saving banners for future referance. Most likeley the fastest open-source scanner there is. Can do up to ~300.000-400.000 test per hour.
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Handy TCP Portscanner - Simple TCP port scanner. Allows you to choose the range of ports to scan. Tested on slackware.
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Variation of the win98 con exploit that crashes netscape as well.
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slipwire.pl is a filesystem integrity checker. It compares the SHA-1 hashes of files to an initial state and alerts the user of any changes. slipwire also records extensive file information such as inode number, last-modified date, filesize, uid, gid, etc, and can also report changes in any of these.
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Etherape is an etherman clone which displays network activity graphically. Active hosts are shown as circles of varying size, and traffic among them is shown as lines of varying width. It is GNOME and pcap based.
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Security Auditor's Research Assistant (SARA) is a security analysis tool based on the SATAN model. It is updated frequently to address the latest threats. Checks for common old holes, backdoors, trust relationships, default cgi, common logins.
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