Discover LinuxSecurity Features

Password guessing as an attack vector

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Using password guessing as an attack vector. Over the years we've been taught a strong password must be long and complex to be considered secure. Some of us have taken that notion to heart and always ensure our passwords are strong. But some don't give a second thought to the complexity or length of our password.

Squid and Basic Authentication

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This is perhaps the easiest authentication helper to configure in Squid, but also the most insecure. The biggest problem with Basic is it transmits username and password in clear text, hence very susceptible to network sniffing or man in the middle type attacks. The only reason I

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Free Online security course (LearnSIA) - A Call for Help

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The Survivability and Information Assurance (SIA) course was originally developed by a team at Carnegie Mellon, led by Lawrence Rogers (https://www.cert.org/sia/). Back in 2010, I requested a license to continue the development of the course because it provides useful information on Information Assurance. Also, this course will always be freely available for anyone to use in the classroom or self-study. There are three parts to the LearnSIA curriculum.

Using the sec-wall Security Proxy

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This article full of examples will show you various ways to test services secured using sec-wall, a feature-packed high performance security proxy. We'll be using cURL, a popular Linux command line tool and PycURL - a Python interface to cURL. As of version 1.0, sec-wall supports HTTP Basic auth, digest auth, custom HTTP headers, XPath-based authentication, WS-Security & SSL/TLS client certificates and each of the options is being shown below.

sec-wall: Open Source Security Proxy

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sec-wall, a recently released security proxy is a one-stop place for everything related to securing HTTP/HTTPS traffic. Designed as a pragmatic solution to the question of securing servers using SSL/TLS certificates, WS-Security, HTTP Basic/Digest Auth, custom HTTP headers, XPath expressions with an option of modifying HTTP headers and URLs on the fly.

Meet the Anti-Nmap: PSAD

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Having a great defense involves proper detection and recognition of an attack. In our security world we have great IDS tools to properly recognize when we are being attacked as well as firewalls to prevent such attacks from happening. However, certain attacks are not blindly thrown at you - a good attacker knows that a certain amount of reconnaissance and knowledge about your defenses greatly increases the chances of a successful attack. How would you know if someone is scanning your defenses? Is there any way to properly respond to such scans? You bet there is...

Master's Student: Social Engineering is not just a definition!

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We are happy to announce a new addition to the Linux Security Contributing Team: Gian G. Spicuzza. Currently a Graduate Student pursuing a Masters Degree in Computer Security (MSIA), Gian is a certified Linux/Unix administrator, the lead developer for the OSCAR-Backup System (at Sourceforge.com) and has experience in a variety of CSO, Management and consulting positions.

His first topic is a quick foray into the world and psychology of Social Engineering:

All the security in the world isn't going to stop one of your employees or coworkers from giving up information. Just how easy is it?

Craig never worked for Linda's company, nor did he call from IT. Craig was an unethical hacker who just gained unauthorized access to her account.
Why? Because a phone call is simple.


Read on to see just how easy businesses can be exploited.

SSH: Best Practices

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If you're reading LinuxSecurity.com then it's a safe bet that you are already using SSH, but are you using it in the best way possible? Have you configured it to be as limited and secure as possible?


Read on for my best practices for using Secure Shell.

Security Features of Firefox 3

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Lets take a look at the security features of Firefox 3. Since its release, I have been testing it out to see how the new security enhancements work and help in increase user browsing security. One of the exciting improvements for me was how Firefox handles SSL secured web sites while browsing the Internet. There are also many other security features that this article will look at. For example, improved plugin and addon security.