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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Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows. Stunnel can allow you to secure non-SSL aware daemons and protocols (like POP, IMAP, NNTP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon's code. Windows binaries available here.
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HAP-Linux is a collection of security related patches which are designed to be applied after Solar Designers Openwall patches are installed. Changes include some extra information in the printks, and the ability to allow hard links to files you don't own which are in your group, and the ability to follow links & pipes in +t directories if they are not world-writable. This is useful for getting various daemons to run chrooted as a non-root user, and some secure drop- directory stuff.
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Nmap is a utility for port scanning large networks, although it works fine for single hosts. Sometimes you need speed, other times you may need stealth. In some cases, bypassing firewalls may be required. Not to mention the fact that you may want to scan different protocols (UDP, TCP, ICMP, etc.). Nmap supports Vanilla TCP connect() scanning, TCP SYN (half open) scanning, TCP FIN, Xmas, or NULL (stealth) scanning, TCP ftp proxy (bounce attack) scanning, SYN/FIN scanning using IP fragments (bypasses some packet filters), TCP ACK and Window scanning, UDP raw ICMP port unreachable scanning, ICMP scanning (ping-sweep), TCP Ping scanning, Direct (non portmapper) RPC scanning, Remote OS Identification by TCP/IP Fingerprinting, and Reverse-ident scanning. Nmap also supports a number of performance and reliability features such as dynamic delay time calculations, packet timeout and retransmission, parallel port scanning, detection of down hosts via parallel pings.
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Efshit is an exploit for the efstool vulnerability. Unlike other exploits for this vulnerability, Efshit is robust, has a wide range of attack options, incorporates brute forcing, and actually works.
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