![]() ![]() The opt-in model was an intentional choice to avoid non-trivial compatibility issues with existing applications. This flag has been enabled by default since Visual Studio 2010. EXEs/DLLs tell the operating system they are compatible with ASLR by linking with the /DYNAMICBASE flag. In the interest of brevity, we’ll focus on the details that are relevant to the behavior observed by CERT/CC: T he vast majority of this explanation still holds true through the latest version of Windows 10 (1709). In a previous blog post we explained how ASLR works on Windows. ![]() The briefest of histories : mandatory and bottom-up ASLR The configuration issue is not a vulnerability, does not create additional risk, and does not weaken the existing security posture of applications. In short, ASLR is working as intended and th e configuration issue described by CERT/CC only affects applications where the EXE does not already opt-in to ASLR. In this blog post, we will explain the configuration issue that CERT/CC encountered and describe wo rk arounds to enable the desired behavior. Last week, the CERT/CC published an advisory describing some unexpected behavior they observed when enabling system-wide mandatory Address Space Layout Randomization ( ASLR ) using Windows Defender Exploit Guard (WDEG) and EMET on Windows 8 and above. ![]()
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