Dave Bullock / eecue

photographer, director of engineering: crowdrise, photojournalist, hacker, nerd, geek, human

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Subverting Vista Kernel For Fun And Profit

Joanna Rutkowska

Joanna Rutkowska gave a highly informative talk at Black Hat called "Subverting Vista Kernel For Fun And Profit." In the first part of her talk, she demonstrated an attack on Vista's code signing feature that requires any code that is loaded into the kernel to be signed by Microsoft. Her attack did not take advantage of an implementation bug or a vulnerability, but instead used the built in raw disk write access to change a few lines in the pagefile. Once the pagefile was altered and the changed data was read back into memory she was able to load any code she desired into the kernel. She stated that this didn't mean that Vista was insecure, just not as secure as Microsoft says.

I talked to her for a few minutes today about her talk and asked if she was going to be releasing the code, and she said she didn't see the point of doing that. Her goal was not to provide people with a way to hack systems, but to alert the community and Microsoft of a flaw in the system. She also mentioned that she is in active informal discussions with Microsoft and they are aware of the problem and the potential solutions she laid out in her talk, but she didn't want to comment on what they were going to do about it.

Joanna Rutkowska

The second part of her talk covered a proof of concept root kit called Blue Pill that takes advantage of the extremely powerful new virtualization features in the new 64 bit AMD processors. Blue Pill takes a running operating system and completely virtualizes it beneath a Hypervisor which can then be used to intercept certain system calls and execute arbitrary code nearly completely invisible to the user. As the system is truly virtualized on the processor level and not in kernel and userspace, the virtualized system has direct access to the hardware (except for calls the hypervisor is intercepting) and detection would be non-trivial to say the least. Although she did her research on the AMD processor, she said the same attacks would be possible on the new Intel chips, although their virtualization implementation was not as powerful.

where do you want to go today?

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Hardware Hacks and Cracks with FPGAs

FPGA Array

"Faster Pwning Assured: Hardware Hacks and Cracks with FPGAs" with David Hulton & Dan Moniz. I didn't stay for this talk, as I'd seen Hikari's original talk at LayerOne a couple years back, but I did get a couple shots of him and the expanded setup of FPGAs.

Hikari, David Hulton

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Xerox Multifunction Device In Your Network?

Brendan O

Brendan O'Connor gave a talk called "Vulnerabilities in Not-So Embedded Systems" about how easy it is to take over the computers that run the Xerox Multifunction Devices. Basically he wants people to treat these supposed embedded systems as servers which they really are. Through his research he found that the Xerox systems didn't have the GRUB boot loader locked down with a password so he was able to gain access to the system and basically do whatever he wanted with it. These systems are dangerous because they are full linux systems, but the user doesn't have access to it so they are unable to secure it. As you know services are constantly being found to be vulnerable and relying on a technician to come and patch your copier isn't going to keep your network safe. It would be wise for vendors to allow users access to these systems so that they can keep them safe.

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Breaking AJAX Web Applications - Black Hat 2006 Day 2

Alex Stamos

Alex Stamos and Zane Lackey gave a talk at Black Hat called "Breaking AJAX Web Applications: Vulns 2.0 in Web 2.0". As AJAX evolves from a toy used by teenyboppers to a serious tool used by banks, hospitals and uncle same, it becomes more and more important to ensure bug free code. AJAX has changed web attacks by exposing the use of frameworks used by the applications via included .js files which expose supported calls. Cross site scripting becomes more complicated as you can inject script into the javascript stream. Injection attacks are also more dangerous due to front ends that are exposed in the client side code. Business logic in applications has become more complex so parameter manipulation vulnerabilities are still excellent attacks.

XSS becomes more complicated and more interesting because you can just put javascript right into a running javascript engine, which becomes harder to escape as you're no longer looking for brackets and tags.

Because your browser is running a javascript application, if an attacker sends you rogue code, in say link form in your cool AJAX email app, your browser will run the code sent in the webmail application instead of loading it in a new page and then the attacker would be sent your authentication cookie. The attacker would then have access to your web mail. The speakers used the fictitious company Webmail.com in this example, and when asked about gmail they responded that they have more lawyers than webmail.com, but it was pretty clear the attack they were talking about was possibly on gmail.

Dynamic script nodes allow attackers to embed malicious javascript in a website that would allow a cookie from any site to be pulled because browsers allow cross domain XmlHttpRequests, this is very bad!

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State of Disclosure Panel

Jerry Dixon

The big vendors are more willing to talk to the researchers and the end users are more apt to work with the vendors. Most vendors are very cooperative about security issues and disclosure. The Cicso incident has made big vendors more willing to work with end users and security researchers, and all in all the incident was good for the security industry. Large customers of big vendors want earlier disclosure information to be shared with them before the smaller customers, but the consensus is that early disclosure for big customers is a bad idea, even to the point of not giving preferred treatment even to internal networks and devices. A very large part of the discussion involved when vendors have a vulnerability and not a fix. There was no clear consensus on this topic, but the vendors felt they shouldn't disclose a vulnerability unless they have a fix for it except in extreme circumstances. Vendors don't want to draw attention to a flaw that people don't know about, so they aren't likely to disclose. One of the best things is that vendors are talking more, talking to researchers and working together to fix problems.

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BlueBag - Mobile Covert Bluetooth Attack and Infection Device

BlueBag

I missed Claudio Merloni and Luca Carettoni's talk about their cool suitcase based bluetooth hacking system named BlueBag, because I was fighting an epic battle with a cruel hangover this morning. I did get a chance to talk to them and photograph the bag up close in the press room. The system inside is a low powered Micro-ATX motherboard running Gentoo Linux and the custom software that does the actual hacking will be available soon on their website. The system can detect and attack bluetooth devices from distances of over several hundred feet thanks to the built in amplifiers and the attacker can access the BlueBag system via a laptop remotely. The BlueBag has a side effect of knocking out 802.11b within about 10 meters due to the bluetooth amps. They chose not to fly with the BlueBag and instead shipped it in to Vegas, which was probably a good idea due to the extremely suspicious contents of the case. More photos of the BlueBag here.

The guys from Flexilis a little bird told me... Shawn Embleton Ryan Cunningham Sherri Sparks Dan Kaminsky Ofir Arkin physical mail forwarders Dan Larkin Dan Larkin Jeff Moss and Dan Larkin Jeff Moss aka Dark Tangent Jeff Moss aka Dark Tangent Jeff Moss aka Dark Tangent black hat swag