MIMEDefang is a flexible MIME email scanner designed to protect Windows clients from viruses. Includes the ability to do many other kinds of mail processing, such as replacing parts of messages with URLs. It can alter or delete various parts of a MIME message according to a very flexible configuration file. It can also bounce messages with unacceptable attachments. MIMEDefang works with Sendmail 8.11/8.12's new "Milter" API, which makes it more flexible and efficient than procmail-based approaches.
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Dazuko is a kernel module which provides 3rd-party applications with an interface for file access control. Useful for on-demand virus scanning, as a file-access monitor/logger or external security implementations. It operates by intercepting file-access calls and passing the file information to a 3rd-party application. The 3rd-party application then has the opportunity to tell the kernel module to allow or deny the file-access. The 3rd-party application also receives information about the file, such as type of access, process ID, user ID, etc.
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Mod_security is an Apache module whose purpose is to protect vulnerable applications and reject human or automated attacks. In addition to filtering requests, it also can create Web application audit logs. Understands regular expressions and POST payloads and runs on both branches of Apache. Windows binary available here.
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FireHOL a simple yet powerful way to configure stateful iptables firewalls. It can be used for almost any purpose, including control of any number of internal/external/virtual interfaces, control of any combination of routed traffic, setting up DMZ routers and servers, and all kinds of NAT. It provides strong protection (flooding, spoofing, etc.), transparent caches, source MAC verification, blacklists, whitelists, and more. Its goal is to be completely abstracted and powerful but also easy to use, audit, and understand.
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File::Scan allows users to make multiplatform virus scanners which can detect Windows/DOS/Macintosh viruses. It includes a virus scanner and signature database.
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authfail is a tool for adding IP addresses to an ACL when entities from those addresses attempt to log into a system, but cause authentication failures in auth.log. It reads data from auth.log in real time and adds the IP into netfilter with a DROP/REJECT policy.
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YAVR, or Yet Another antiVirus Recipe, is a procmail recipe that helps filter out many of the common e-mail worms and viruses.
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Vuurmuur is a middle-end and front-end for netfilter and iptables that is aimed at system administrators who need a decent firewall, but do not have netfilter specific knowledge. It converts human-readable rules into an iptables ruleset (or optional a bash script), makes netfilter logs readable, and includes an ncurses GUI.
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Packet Storm new exploits for October, 2004.
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A vulnerability in bogofilter/bogolexer causes a segmentation fault due to malformed input.
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NixFo NG is a script that scans Linux-based systems and does a complete inventory of anything installed, available, manipulated, or other wise.
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