Flawfinder searches through source code for potential security flaws, listing potential security flaws sorted by risk, with the most potentially dangerous flaws shown first. This risk level depends not only on the function, but on the values of the parameters of the function. Secure Programming HOWTO here.
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Exec Denier is a kernel module for NetBSD that restricts exec syscalls for certain UIDs. It is very useful for blocking exec calls for named and ntpd. It can also restrict exec calls for users to a certain directory. Changelog available here.
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Sms.c allows you to control any unix server via mobile phone, two way pager, or email.
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Microsoft Security Advisory MS02-023 - Six new serious vulnerabilities were discovered in Internet Explorer 5.01, 5.5, and 6.0. Some allow malicious web sites or HTML email to execute code, while others disclose information or allow malformed executables on a web page to download and run on the users system. Microsoft patch available here.
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