NewSyslog is an updated version of a package put together by Theodore Tso of MIT Project Athena (which is included in NetBSD, FreeBSD, OpenBSD, etc.). This version has a mix of features from all of the other versions, and it has been made more portable than any of the others with the help of GNU Autoconf.
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ViperDB is a file checker. It is meant to be run from cron on a regular basis in order to monitor strange activity on a system. It supports checking of size, mtime, privileges, UID/GID, added/deleted files, and (as of 0.9.3) MD5 checksums. Data isn't stored in a single archive as in tripwire, but is split among all the monitored directories. This ViperDB is in fact a fork of the original, as the original authors seem unreachable.
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MD5mon is a file monitor that verifies files by computing their checksums. The shell script is suitable for use as a basic security checking tool from cron. It features configurable monitoring levels, local copies of find/md5sum, and integrity checks to prevent tampering with itself. It can also use a more secure shasum instead of md5sum.
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Microsoft Security Advisory MS01-012 - Outlook and Outlook Express can be tricked into executing arbitrary code via email messages which contain malformed vCards. When the vCard is opened, a buffer overflow error can cause Outlook to crash, or take any desired action, limited only by the permissions of the recipient on the machine. Microsoft FAQ on this issue available here.
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Arb-Scan is a remote banner scanner, written in Bash and Perl. It currently supports ftpd, sshd, smtpd, domain, finger, httpd, pop2, pop3 and imapd banner checks. It features IP file reading and logging.
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