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Windows 8 Exploit Mitigation Improvements
Cloudflare Ray ID: 34be22e8f5e70994 • Your IP: 220.127.116.11 • Performance & security by Cloudflare I'm wondering what they used. Black Hat 385 views 46:21 Easy Local Windows Kernel Exploitation | Black Hat 2012 USA - Duration: 36:33. The majority of these improvements focused on restricting low integrity processes from accessing certain system and process information classes that intentionally expose kernel address space information.
If desired, an application can also elect to prevent non-relocatable images from being loaded. HackersOnBoard 1,861 views 35:45 Loading more suggestions... As such, the Force ASLR feature is not enabled by default for applications running on Windows 8. Ryobi Riding Lawn Mower questions... [HomeImprovement] by Body Count325.
In addition, the method used to forcibly relocate executable images that have not been built with /DYNAMICBASE can have a performance impact due to decreased page sharing. It should be noted, however, that the size of the 32-bit address space places practical constraints on the impact of this, particularly in cases where an attacker is able to fill Garrett Fogerlie 144 views 44:51 Data-Only Pwning Microsoft Windows Kernel - Duration: 25:01. Close Yeah, keep it Undo Close This video is unavailable.
SecurityTubeCons 612 views 53:45 Blackhat 2010 - Exploiting Remote timing attacks - Duration: 1:12:01. No, create an account now. Yes, my password is: Forgot your password? Working...
This means it will be more difficult for attackers to exploit local kernel vulnerabilities as a means of escaping these sandboxes. As such, the Windows kernel makes a best-effort attempt to ensure that these images load below 4 GB. Hak5 64,425 views 6:53 ShmooCon 2014: Introducing DARPA's Cyber Grand Challenge - Duration: 35:45. In Windows 8, Microsoft has made a number of substantial improvements that are designed to break known exploitation techniques and in some cases prevent entire classes of vulnerabilities from being exploited.
High Entropy Randomization One of the major differences between 64-bit and 32-bit applications on Windows is the size of the virtual address space that is made available to a process. 64-bit Since 64-bit applications do not suffer from these limitations by default, it is possible to significantly increase the amount of entropy that is used by ASLR. Black Hat 552 views 36:33 Windows Kernel Vulnerability Research and Exploitation - Gilad Bakas - Duration: 56:09. In addition, executable images that are randomized by the Force ASLR feature receive high degrees of entropy as a result of the high entropy bottom-up randomization feature being enabled for an
While the mechanics of disclosing address space information are typically dependent on the application and vulnerability that are being exploited, there are some general approaches that attackers have identified. Sign in Transcript Statistics Add translations 138 views 1 Like this video? SNY Streaming on NBCSports Presented by Verizon. Unsubscribe from Garrett Fogerlie?
Rating is available when the video has been rented. Hungry Man, Nov 8, 2012 #3 funkydude Registered Member Joined: Apr 5, 2004 Posts: 6,874 Hungry Man said: so there's clearly still work to be done.Click to expand... Black Hat 853 views 43:18 PinPadPwn | Black Hat 2012 USA - Duration: 58:39. Prior to Windows 8, bottom-up and top-down allocations were not randomized by ASLR.
Hope to get it on Aug.15 from somewhere p.s. You Can't Exploit What You Can't Find - Duration: 39:17. Garrett Fogerlie 1,122 views 36:33 Sexy Defense, Maximizing the Homefield Advantage | Black Hat 2012 USA - Duration: 58:31. Not Available to VZ [VerizonFiOSTV] by The Fuzz 53696.
Force ASLR For compatibility reasons, executable images (DLLs/EXEs) must indicate their desire to be randomized by ASLR through the /DYNAMICBASE flag provided by the Visual C++ linker. Add to Want to watch this again later? Something is happening / Quelque chose se passe [Ebox] by EboxMartin673. 24, 7, 365 [No,IWillNotFixYour#@$!!Computer] by onebadmofo664.
In this way, fragmentation within the address space is minimized while also realizing the benefits of randomizing the base address of all memory allocations that are not explicitly based.
This is because systems today do not have enough memory available to spray the amount that would be needed to achieve even small degrees of reliability. Black Hat 252 views 44:51 HakTip - Packet Sniffing 101: Promiscuous Mode - Duration: 6:53. Please try again later. This feature is not available right now.
Don’t open any unknown file types, or download programs from pop-ups that appear in your browser. This equates to 24 bits of entropy, or a 1 in 16,777,216 chance of guessing the start address correctly. Loading... Loading...
When enabled, this feature forces all relocatable images to be randomized when they are loaded by the application, including those images which have not been linked with /DYNAMICBASE. Srvs posted Apr 7, 2017 at 8:57 AM Windows 8 Exploit Mitigation Improvements Discussion in 'Microsoft' started by Umbra, Apr 28, 2014. Close Yeah, keep it Undo Close This video is unavailable. Also worth nothing is the improvements in the 64bit build over the 32bit build of Windows 8, it's not just isolated to entropy.
This is where well-known mitigations like Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) come into play – both of which have been supported on Windows for many releases There are definitely very few OS exploits over the last few years due to the recent changes and MS is ensuring that that continues with Windows 8. Sign in to add this video to a playlist. Quick Tip Without meaning to, you may click a link that installs malware on your computer.
Image pointers removed from SharedUserData Windows uses an internal data structure known as SharedUserData to efficiently communicate certain pieces of information from the kernel to all processes on a system. Because of these constraints, the vast majority of 64-bit EXEs and DLLs in Windows 8 and Windows 8.1 have been based above 4 GB to ensure that they benefit from the Sign in to make your opinion count. This meant that allocations made through functions like VirtualAlloc and MapViewOfFile had no entropy and could therefore be placed at a predictable location in memory (barring non-deterministic application behavior).
CQURE Academy 1,335 views 28:23 Windows Kernel Vulnerability Research and Exploitation - Gilad Bakas - Duration: 56:09.