by Paul Asadoorian on April 1, 2009
The Tenable research team has been steadily working on creating accurate checking for Conficker infected hosts. Over the weekend researchers Felix Leder and Tillmann Werner of the University at Bonn released details on how to detect Conficker using network-based checks. This checking methodology was used as a basis for Nessus plugin 36036 as well as the Nmap NSE script created for the same purpose.
by Paul Asadoorian on April 1, 2009
Penetration testers spend a lot of time searching for software vulnerabilities, such as buffer overflows or SQL injection. However, there are many other ways in which networks and systems can present vulnerabilities. Open SMB file shares can disclose sensitive information about an organization: I've found everything from student grades to bank account numbers using this technique. A great way to check for the presence of open SMB shares is to run a quick Nessus scan from the command line as follows:
by Paul Asadoorian on March 31, 2009
Many of today's latest worms and viruses are using interesting methods to propagate across the network. For example, the Conficker.A / Downadup worm sets up a web server for victims to connect to and download a copy of the malware. What I find interesting about this method is that no matter what request is made to the HTTP server, it responds with a Microsoft executable file. Nessus detects such an HTTP server with plugin id 35322 "HTTP Backdoor Detection":
by Ron Gula on March 30, 2009
Nessus plugin #36036 performs a network based check for Windows computers infected with a variant of the Conficker virus. The scan does not need credentials, but does require ports 445 or 139 to be open between the Nessus scanner and your scanned systems. The plugin is based on research from the University of Bonn in Germany.
by Paul Asadoorian on March 30, 2009
Un-patched and out-of-date software is a common attack vector for penetration testers and attackers alike. Applications such as Adobe Reader and Microsoft Office are popular targets due to their widespread use on Windows systems and user’s willingness to click on just about anything. They both have the ability to perform self-updates, similar to the operating system, but limited to one particular software package. However, what happens when the software update process itself is insecure? Enter a program called "evilgrade", which exploits this process to install software of an attacker's choosing. For this attack to succeed, the victim machine must be the victim of a Man-In-The-Middle (MITM) attack.
by Marcus J. Ranum on March 26, 2009
(PDF version of this is available from my personal website, PDF of Powerpoint handouts from Source Boston 2009)
Since I started in security, 20 years ago, "they aren’t taking security seriously" has been the constant complaint of the security expert. Even in organizations where security is taken seriously, it has been at the expense of living in a constant relationship of opposing management or other business units. Some of us enjoy the strife; most don’t. In fact, most of us enjoy being employed more than we enjoy being right.
by Paul Asadoorian on March 25, 2009
Monitoring networks for potential security violations can uncover some interesting events and surprising aspects of applications.
Base64 encoding is used by many applications to "obscure" the password when it travels across the network. Base64 encoding does not implement a cryptographic algorithm to protect sensitive information, yet is often used in many networks and end-user applications.
by Paul Asadoorian on March 18, 2009
A challenge for many penetration testers is to find a vulnerable system they can use to test their penetration testing skills and tools before they use them against paying clients. I recently found a distribution called "Hackerdemia", a Slax-based Linux distribution containing several vulnerabilities, including un-patched software, mis-configured services, default passwords and a few other surprises. My goal was to bring up the distribution in a virtual machine, assign it an IP address using host-only mode and scan it using Nessus.
by Ron Gula on March 16, 2009
Tenable recently released an audit policy for Linux servers running PHP which tests for hardening recommendations from the Open Web Application Security Project (OWASP). OWASP maintains a set of guidelines for hardening web servers, with specific attention given to PHP and Cold Fusion technologies.
by Ron Gula on March 13, 2009
Tenable has been operating a new “Discussions Forums” web site for all Nessus users and Tenable customers. The forum is located at https://discussions.nessus.org/. It offers the following discussion areas:
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Your Tenable Vulnerability Management trial also includes Tenable Lumin and Tenable Web App Scanning.
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