Hi folks. I've been involved in a fuzzing effort at CERT. One of the ways that I've been able to discover vulnerabilities is through "dumb" or mutational fuzzing. We have developed a framework for performing automated dumb fuzzing. Today we are releasing a simplified version of automated dumb fuzzing, called the Basic Fuzzing Framework (BFF).
Recently there have been some statistics published on botnet Command & Control (C2) channels. These statistics claim that 94.58% of botnet C2 channels are under the .com top level domain (TLD). While it's impossible to accurately comment on those statistics without knowing the methodology used to arrive at them, we at CERT have been doing research concerning malicious domain names that arrives at a different result.
Reading email messages in plain text seems like a reasonable thing to do to improve the security of your email client. Plain text takes less processing than HTML, which should help minimize your attack surface, right? As it turns out, Outlook Express (and its derivatives) is doing more than you think when it is configured with the "Read all messages in plain text" option enabled.
This entry is the first in a series about securely configuring the IPv6 protocol on selected operating systems. Although this entry focuses on how to disable IPv6, we are not recommending that everyone immediately disable IPv6. However, if critical parts of your infrastructure (firewall, IDS, etc.) do not yet fully support the IPv6 protocol, consider disabling IPv6 until those components can be upgraded.
The Kill-Bit (or "killbit") is a Microsoft Windows registry value that prevents an ActiveX control from being used by Internet Explorer. More information is available in Microsoft KB article 240797. If a vulnerability is discovered in an ActiveX control or COM object, a common mitigation is to set the killbit for the control, which will cause Internet Explorer to block use of the control. Or will it?
Slowloris is a denial-of-service (DoS) tool that targets web servers. We have some suggestions about mitigation techniques and workarounds to protect your server. However, use caution if you implement any of these suggestions because they will likely have some unintended side effects.
Two recent US-CERT Vulnerability Notes describe similar issues in the Adobe Reader and Foxit Reader PDF viewing applications. The vulnerabilities, that both applications failed to properly handle JPEG2000 (JPX) data streams, were discovered as part of our Vulnerability Discovery initiative. The two vulnerability notes are quite similar, except for one aspect: attack surface.
The 19th practice described in the newly released edition of the Common Sense Guide to Mitigating Insider Threats is Practice 19: Close the doors to unauthorized data exfiltration. In this post, I discuss how organizations are vulnerable to data exfiltration and offer potential mitigation strategies.