This parameter specifies how to create an RDP session using CredSSP and if insecure RDP is permitted. This error happens when you attempt to create an unsecured RDP connection that is prevented by an Encryption Oracle Remediation policy setting on the server or client. Accompanying shell code then downloads and executes a malicious payload.The malicious code triggers the use-after-free memory-corruption bug.
After being opened, the malicious document causes the second stage of the exploit to be downloaded in the form of an HTML page with malicious code.Targets receive a malicious RTF Microsoft Office document.The vulnerability was discovered to which the exploits observed were: With the release of the March 2018 Security bulletin, there was a fix that addressed a CredSSP, “Remote Code Execution” vulnerability (CVE-2018-0886) which could impact RDP connections. It’s very specific and I tried installing the 2012 non-R2 version on mine twice before realizing there was a separate update for R2.Unable to RDP to Virtual Machine Overview If you aren’t trying to fix Server 2012 R2, here’s a link to a Microsoft article with the version of the update you need. You can get this update through Microsoft’s Update Catalog. The specific update you need to install is KB4103725 to fix the issue. The problem usually clears up on its own after updates. This could be due to CredSSP encryption oracle remediation. The specific error is something like this (I copied from Microsoft).Īn authentication error has occurred. There were two on my Server 2012 R2 box.įix CredSSP Error After Enabling Firewall Access Just enable all of them labeled “Remote Desktop”. Under whatever sort of network you’re connected to there are rules for letting applications and protocols though the firewall. Get into Windows Firewall through the control panel. I don’t have steps for this yet, but it’s fairly simple. Your first step is to let RDP through the firewall.Īllow Remote Desktop Access Through Windows Firewall This is true even if Remote Desktop access is enabled either manually or by group policy. The issue is that at least on virtual machines, Server 2012 won’t let you RDP into the box. I won’t go into specific details because the firewall configuration varies for each version of Windows whether it is Server or a Desktop version.
This fix works on other versions of Windows as well. I’d run into this problem before but it cleared up on its own after updates. Had to set up a new Windows Server 2012 R2 virtual machine.
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