The GNU Privacy Guard (GnuPG) is GNU's tool for secure communication and data storage. It is a complete and free replacement of PGP and can be used to encrypt data and to create digital signatures. It includes an advanced key management facility and is compliant with the proposed OpenPGP Internet standard as described in RFC2440.
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Port Scan Attack Detector (psad) is a collection of four lightweight daemons written in Perl and C that are designed to work with Linux firewalling code (iptables and ipchains) 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, 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, UDP, and ICMP 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. Psad also uses packet TTL, IP id, TOS, and TCP window sizes to passively fingerprint the remote operating system from which scans originate.
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CERT Advisory CA-2003-22 - Microsoft Internet Explorer contains multiple vulnerabilities, the most serious of which could allow a remote attacker to execute arbitrary code with the privileges of the user running IE. Versions affected are 5.01, 5.50, and 6.01.
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FreeBSD Security Advisory FreeBSD-SA-03:11.sendmail - Some versions of sendmail (8.12.0 through 8.12.8) contain a programming error in the code that implements DNS maps. A malformed DNS reply packet may cause sendmail to crash its child process and may lead to further possible exploitation.
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The Apache DoS Evasive Maneuvers Module is a module for Apache 1.3 and 2.0 that detects and fights off DoS attacks and brute force attempts by adding addresses to a 10-second '403 List' and rejecting rapidly repeated requests for the same URL from the same addresses. This module can be configured to talk to ipchains, ipfilter, or any other tool designed to push the attack out to the network layer, and provides email notification in the event of an attack.
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Kismet is an 802.11b wireless network sniffer. It is capable of sniffing using almost any wireless card supported in Linux, which currently divide into cards handled by libpcap and the Linux-Wireless extensions (such as Cisco Aironet), and cards supported by the Wlan-NG project which use the Prism/2 chipset (such as Linksys, Dlink, and Zoom). Besides Linux, Kismet also supports FreeBSD, OpenBSD and Mac OS X systems. Features Multiple packet capture sources, Runtime network sorting by AP MAC address (bssid), IP block detection via ARP and DHCP packet dissection, Cisco product detection via CDP, Ethereal and tcpdump compatible file logging, Airsnort-compatible "interesting" (cryptographically weak) logging, Secure SUID behavior, GPS devices and wireless devices fingerprinting. Kismet also includes a tool called gpsmap that can be used to create maps from logged GPS data. Full changelog here.
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