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psad-0.9.3.tar.gz

Posted Nov 6, 2001

Site cipherdyne.com

Port Scan Attack Detector (psad) is a perl program that is designed to work with Linux firewalling code (iptables in the 2.4.x kernels, and ipchains in the 2.2.x kernels) to detect port scans. It features a set of highly configurable danger thresholds (with sensible defaults provided), verbose alert messages that include the source, destination, scanned port range, begin and end times, TCP flags and corresponding nmap options (Linux 2.4.x kernels only), email alerting, and automatic blocking of offending IP addresses via dynamic configuration of ipchains/iptables firewall rulesets. In addition, for the 2.4.x kernels psad incorporates many of the TCP signatures included in Snort to detect highly suspect scans for various backdoor programs (e.g. EvilFTP, GirlFriend, SubSeven), DDoS tools (mstream, shaft), and advanced port scans (syn, fin, Xmas) which are easily leveraged against a machine via nmap.

Changes: Fixed a problem that would drop packets that are part of legitimate TCP sessions. The --USR1 command line option was added to have psad automatically send a running psad process a USR1 signal, which is useful for peering into a running scan data structure. An email installation subroutine was added to install.pl.

tags | kernel, perl, tcp

systems | linux

MD5 | 13850681a769d0b08d85f67c99ad6ae3

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