Changes to this policy become effective without a device restart when they are saved locally or distributed through Group Policy. If this policy is not contained in a distributed GPO, this policy can be configured on the local computer by using the Local Security Policy snap-in. This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation.
This setting makes it easier for users with certain types of physical impairments to log on to devices that run the Windows operating system. If this setting is enabled, an attacker could install malware that looks like the standard logon dialog box in the Windows operating system, and capture the user's password.
It basically boils down to the fact that users can't tell if they're at the secure desktop, it's easier to steal the same user credentials inside the desktop, and it's hard to implement on keyboard-less devices. Second is that the SAS has probably been a very low-value protection, overall. See the discussion about a setting where we made it possible to go overboard on the SAS and how that didn't really work out well:".
It's still in force, but Microsoft did that to make the device more accessible to people with disability. Reference there. In Windows OS, WinLogon register the crtl-alt-delete sequence, and allow no one else to listen to that. It's called a Secure Attention Key. A malware would need to modify or hijack the winlogon process to achieve the goal to capture that sequence.
WinSta0 is the name of the window station object that represents the physical screen, keyboard and mouse. Winlogon creates the following desktops in the WinSta0 object. Sign up to join this community. The best answers are voted up and rise to the top.
Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Windows Control Alt Delete required to get to login after windows updates Discus and support Control Alt Delete required to get to login after windows updates in Windows 10 Ask Insider to solve the problem; This issue first appeared on my work PC when it was last updated and now it has appeared on my gaming laptop again after updates.
Control Alt Delete required to get to login after windows updates. Eric Ber Win User. Type control userpasswords2 or netplwiz and press the Enter key. Click the Advanced tab. Click Apply. Restart your computer.
Should you need further assistance, don't hesitate to get back to us. The interrupt is mapped to an ISR which is executed at ring0, which triggers the OS's internal handler for the event. Offler Those customisations were installed as administrator. The UAC warning seems also to be only something to click away. ATM have just a dialog that looks like the annoying java thing and most people will blindly click update While Winlogon itself has customization hooks that can be used to present a different ui, read a smartcard, support a 2-factor keyfob, and so forth, the point remains that those hooks can only be installed by a suitably privileged user.
The things Offler described are all easily done with those hooks, and were certainly installed by an administrator, possibly through a customized system installation kit. Show 21 more comments. Thomas Pornin Thomas Pornin k 57 57 gold badges silver badges bronze badges. Hang on a second. And malware that does the same thing?
D3C4FF Just because you can't intercept the message does not mean you can't tell windows what to do when it receives the message. The important phrase from Thomas' post is " without needing administrative rights " — Scott Chamberlain. ScottChamberlain ah quite right. I missed the administrative rights part there.
That's why backdooring keyboards makes sense d: — JSmyth. Add a comment. To quote the accepted answer by Oskar Duveborn, The Windows NT kernel is designed to reserve the notification of this key combination to a single process: Winlogon. Community Bot 1.
Whereas: In Windows when you press the SAK it forcibly summons a separate desktop, which you can think of as being kind of like a separate X server process. TildalWave TildalWave Good additional detail here, though. The idea of using an "interrupt any running application" key as the cue for a log-in prompt predates Windows by quite awhile.
Adnan: You used three whole fingers? Here's a picture of me doing it with just two fingers on one hand! This answer is correct - although it has no relevance in the security. As such, you probably don't want to do it accidentally, so two hands are needed altgr doesn't trigger this behaviour — jackweirdy.
Originally it was designed for debugging purposes by the Intel team and was never intended to be used by users. On the specific keyboard used by the specific developer who originally designed it, yes, it was impossible to hit those keys one-handed. It wasn't until, what 20 years later that Windows started using it for login purposes? Show 8 more comments. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete?
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