Defcon 16: Biometric Cloning


One of the more novel talks we saw at Defcon was [Zac Franken] presenting on access control systems. He covered several different types, but the real fun was his live demo of bypassing a hand geometry scanners like the one pictured above. With the help of two assistants, 4 pounds of chromatic dental alginate, and 5 liters of water, he made a mold of his hand. The box he placed his hand in had markings to show where the pegs on the scanner are located. After 2 minutes he could remove his hand from the cavity. They then filled the mold with vinylpolysiloxane, making sure to remove all bubbles. 20 minutes later the hand was solid and passed the scanner’s test. This may not be a completely practical attack, but it does defeat the overall idea of biometrics; biometrics are built on the assumption that every person is unique and can’t have their features reproduced.

[Zac] also showed an interesting magnetic card spoofer that emulated all three tracks using coils of magnet wire. We hope to see more about that in the future.

[photo: morgan.davis]

Defcon 16: Glimpses Of The Network Operations Center


Wired’s Threat Level takes us on a photo tour of the Defcon Network Operations Center, giving a unique behind-the-scenes perspective of one of the largest computer security conventions. The Defcon Network Operations Center is run by a volunteer group named the “Goons”. They keep operations running smoothly and securely with both high and low-tech resources, like a Cisco fiber switch and an armed guard, to protect the router and firewall.

Black Hat 2008: Google Gadgets Insecurity


Black Hat presenters [Robert “RSnake” Hansen], CEO of SecTheory, and [Tom Stracener], security analyst at Cenzic, criticized Google in their presentation “Xploiting Google Gadgets”. [Hansen] and [Stracener] say that there’s currently no way for Google to confirm whether Google Gadget creations contain malicious content or not; this leaves the application vulnerable to a wide range of hacking ugliness such as data poisoning, worms, and theft of data. [Hansen] himself isn’t exactly on the friendliest terms with Google. He’s got a bit of a contentious history and he claims that Google has threatened legal action against him. Nevertheless, if what was presented is true and accurate, then Google has a huge security issue that needs to be addressed sooner rather than later. Google has not yet commented on the situation.

Black Hat 2008: What’s Next For Firefox Security

Mozilla security chief [Window Snyder] made some surprising announcements about Firefox Next, Mozilla’s next major browser overhaul. In her chat at the Black Hat security conference, she introduced three new initiatives that focused on threat modeling, training, and vulnerability metrics. For the threat modeling initiative, she’s hired Matasano Security consultants to review Firefox’s code for weaknesses and recommend mitigation tactics to protect the browser from hacker attacks. This isn’t inherently unusual; what is abnormal is that the information, once the work is done, will be revealed to the public. The training initiative will have IOActive trainers working with Mozilla engineers on secure computer programming practices. At the end, according to [Snyder], online versions of the classes will be released to the public, along with the class materials. The last initiative revolves around security metrics, and is already in progress. Essentially, the project will ideally take the focus off of patch-counting and provide a better assessment of security and vulnerability issues. [Snyder] says “We’re in the early phase, working on incorporating feedback from the rest of the industry.” She also reveals some more Firefox developments, including possibly incorporating NoScript into the core browser and implementing protected mode, but they’re still a long way from becoming standard features.

Black Hat 2008: FasTrak Toll System Completely Broken


FasTrak is the electronic toll collection system used by the state of California. Motorists can purchase a toll transponder for ~$26 and link the serial number with a debit account to have their tolls deducted automatically. Today at Black Hat in Las Vegas, security researcher [Nate Lawson] presented not just the privacy problems with FasTrak, but why absolutely no transaction from the tag should be trusted.

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Black Hat 2008: EFF Coders’ Rights Project Announced

The EFF has just announce the creation of the Coders’ Rights Project website at the Black Hat conference. The sites’ main goal is to centralize legal information for coders, and to help protect important security work from legal actions that may be taken against them with the DMCA and other legal black holes. While this is in no way a fully comprehensive list of everything you need to know, it looks like a good place to start, and provides a few FAQs for suggestions on how to stay in the legal clear as much as possible. At numerous points the documents suggest you speak with a lawyer, if you have any deeper questions, which you absolutely should. This can be very helpful if a person or group finds a security risk, and wants to publish it, or just wants to start looking into possible security risks.

More On GIFAR


[pdp] provides some perspective on the news regarding the GIFAR attack developed by researchers at NGS Software. As he explains, the idea behind the attack, which basically relies on combining a JAR with other files is not new. Combining JAR/ZIP files with GIF/JPG files will create hybrid files with headers at both the top and bottom of the file and allow them to bypass any image manipulation library as valid files. While tightened security and more stringent file validation practices are advisable, the problem is larger than just a vulnerability in browser security. ZIP is an incredibly generic packing technology used everywhere, from Microsoft files to Open Office documents, and of course, in JAR files. He closes with, “any file format that is based on ZIP, you allow your users to upload on your server, can be used in an attack”

[photo: Jon Jacobsen]