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About

BlueKeep (CVE-) is a safetyvulnerability that was discovered in Microsoft's Remote Desktop Protocol (RDP) implementation, which let for the chanceof remote code execution.

First reported in May 2019, it is showin all unpatched Windows NT-based versions of Microsoft Windows from Windows 2000 through Windows Server 2008 R2 and Windows 7. Microsoft problem a safetypatch (including an out-of-band update for several versions of Windows that have reached their end-of-life, such as Windows XP) on 14 May 2019. On 13 August 2019, associatedBlueKeep safetyvulnerabilities, collectively named DejaBlue, were reported to affect newer Windows versions, including Windows 7 and all lastestversions up to Windows 10 of the operating system, as well as the older Windows versions. On 6 September 2019, a Metasploit exploit of the wormable BlueKeep safetyvulnerability was announced to have been released into the public realm.

History

The BlueKeep safetyvulnerability was first noted by the UK National Cyber SafetyCentre and, on 14 May 2019, reported by Microsoft. The vulnerability was named BlueKeep by computer safetyexpert Kevin Beaumont on . BlueKeep is officially tracked as: CVE- and is a "wormable" remote code execution vulnerability.

Both the U.S. National SafetyAgency (which problem its own advisory on the vulnerability on 4 June 2019) and Microsoft stated that this vulnerability could potentially be utilize by self-propagating worms, with Microsoft (based on a safetyresearcher's estimation that nearly 1 million devices were vulnerable) saying that such a theoretical attack could be of a similar scale to EternalBlue-based attacks such as NotPetya and WannaCry.

On the same day as the NSA advisory, researchers of the CERT Coordination Center disclosed a separate RDP-associatedsafetyproblemin the Windows 10 May 2019 Update and Windows Server 2019, citing a freshbehaviour where RDP Network Level Authentication (NLA) login credentials are cached on the client system, and the utilize shouldre-gain admissionto their RDP connection automatically if their network connection is interrupted. Microsoft dismissed this vulnerability as being intended behaviour, and it shouldbe disabled via Group Policy.

As of 1 June 2019, no active malware of the vulnerability seemed to be publicly known; however, undisclosed proof of concept (PoC) codes exploiting the vulnerability may have been available. On 1 July 2019, Sophos, a British safetycompany, reported on a working example of such a PoC, in order to emphasize the urgent need to patch the vulnerability. On 22 July 2019, more details of an exploit were purportedly revealed by a symposiumspeaker from a Chinese safetyfirm. On 25 July 2019, computer experts reported that a commercial version of the exploit may have been available. On 31 July 2019, computer experts reported a significant increase in malicious RDP activity and warned, based on histories of exploits from similar vulnerabilities, that an active exploit of the BlueKeep vulnerability in the wild might be imminent.

On 13 August 2019, associatedBlueKeep safetyvulnerabilities, collectively named DejaBlue, were reported to affect newer Windows versions, including Windows 7 and all lastestversions of the operating system up to Windows 10, as well as the older Windows versions.

On 6 September 2019, an exploit of the wormable BlueKeep safetyvulnerability was announced to have been released into the public realm. The initial version of this exploit was, however, unreliable, being known to cause "blue screen of death" (BSOD) errors. A fix was later announced, removing the cause of the BSOD error.

On 2 November 2019, the first BlueKeep hacking campaign on a mass scale was reported, and contain an unsuccessful cryptojacking mission.

On 8 November 2019, Microsoft confirmed a BlueKeep attack, and urged users to immediately patch their Windows systems.

Mechanism

The RDP protocol utilize "virtual channels", configured before authentication, as a data path between the client and server for providing extensions. RDP 5.1 defines 32 "static" virtual channels, and "dynamic" virtual channels are contained within one of these static channels. If a server binds the virtual channel "MS_T120" (a channel for which there is no legitimate reason for a client to connect to) with a static channel other than 31, heap corruption occurs that let for arbitrary code execution at the system level.

Windows XP, Windows Vista, Windows 7, Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2 were named by Microsoft as being vulnerable to this attack. Versions newer than 7, such as Windows 8 and Windows 10, were not affected. The Cybersecurity and Infrastructure SafetyAgency stated that it had also successfully achieved code execution via the vulnerability on Windows 2000.

Mitigation

Microsoft released patches for the vulnerability on 14 May 2019, for Windows XP, Windows Vista, Windows 7, Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2. This contain versions of Windows that have reached their end-of-life (such as Vista, XP, and Server 2003) and thus are no longer eligible for safetyupdates. The patch forces the aforementioned "MS_T120" channel to always be bound to 31 even if requested otherwise by an RDP server.

The NSA suggestedadditional measures, such as disabling Remote Desktop Services and its associated port (TCP 3389) if it is not being utilize, and requiring Network Level Authentication (NLA) for RDP. According to computer safetycompany Sophos, two-factor authentication may make the RDP problemless of a vulnerability. However, the best protection is to take RDP off the Internet: switch RDP off if not requiredand, if needed, make RDP availableonly via a VPN.

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Details

BlueKeep
A logo created for the vulnerability, featuring a keep, a fortified tower built within castles.
CVE identifier(s)CVE-Date patched14 May 2019; 2 years ago (2019-05-14)DiscovererUK National Cyber Security CentreAffected softwarepre-Windows 8 versions of Microsoft Windows
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