What are your favorite tools for checking for vulnerabilities in websites?

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I've used Nessus before. It takes a bit to setup, but has a pretty comprehensive set of tests.

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Nessus went commercial, there's OpenVAS instead. – Anonymous Dec 2 '09 at 11:27
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nmap is great for giving you the ports that are open and what is running on them

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It's not free, but McAfee Secure does an excellent job and provides very detailed reporting.

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hping

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Check insecure Dot Org... and web scanner There are lots of great security tools there. Some are open source, other are commercial.. nikto praros proxy web scarab web inspect burpsuit whisker wikto acunetix wvs watchfire appscan n-Stealth

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WebInspect is pretty good, but pricey. It takes a lot of handholding as well, not a lot of automated use.

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Why the -1? I'll take that you don't like it, but at least leave a comment! – Bill Weiss Aug 16 '10 at 19:09
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I suggest you to use a commercial web application security scanner.A list of WASS : http://www.webscanners.net/webscanners/index.html

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i prefer nessus as wonderful tool that is easy to use

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