MICROSOFT was forced to act quickly after more than 200,000 computers around the world were subject to a massive cyber attack.

It came amid concerns networks were left vulnerable because they were still using outdated Windows XP software.

May 13, 2017  Download updates for Windows XP, Windows 8, or Windows Server 2003: All, Now that Microsoft have. The KB for MS17-010 typically will come through Windows update, you can download the stand alone patch from the update catalog. You can find direct links to the. Download updates for Windows XP, Windows 8, or Windows Server 2003: All, Now that Microsoft have.

What is Microsoft's MS17-010 Windows patch?

Microsoft released a critical security patch update for Windows XP, Server 2003 and Windows 8 after systems were infected by ransomware, known as WannaCry, on May 12.

WannaCrypt - an earlier version of the malware - used previously leaked tools by the US's National Security Agency to exploit vulnerabilities in the Windows platform.

Microsoft patched the vulnerability using MS17-010 in March - but only for current platforms.

Therefore those running older systems, such as Windows XP, Windows 8 and Server 2003 weren't provided with a fix.

After the international attack, Microsoft changed its stance on 'end-of-life' patching and provided a mass fix, according to CSO Online.

The WannaCry ransomware affected more than 200,000 victims, including a fifth of the NHS trusts as well as other major global businesses.

How can you protect your PC from Wannacry ransomware?

Microsoft has urged anyone who hasn't already updated their system with the security update to do so immediately.

Individuals should also install any other software updates and switch on auto-updaters where possible.

Microsoft also recommends running its free anti-virus software for Windows.

Marcus Hutchins, 22, from Devon, has been hailed an “accidental hero” after he managed to stop the virus in its tracks by triggering a “kill switch”.

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But there are other steps you should be taking to ensure you keep your information protected. These include:

• Ensuring you regularly back up your files by regularly saving copies in a completely separate system, such as an external hard drive.
• Never click on links you don't recognise or download files from people you don't know or trust.
• Install an anti-virus software and check for regular security updates.

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I googled a lot about this but could not find the answer.

I would like to understand if patching Windows with the MS17-010 update will prevent WannaCry malware from installing/executing or just prevent the malware (once installed on a certain PC and therefore infecting it) from propagating through the intranet?

Also, if the MS17-010 patch is properly installed, are there any benefits from disabling SMBv1 too? Or MS17-010 patch itself can be considered enough?

Last question/doubt: before disabling SMBv1, how to be sure that this will not affect network performance/reliability?

1 Answer

First, a little preface. The MS17-010 patch is included in all the update rollups for Windows 7, 8.1 and 10 from March onwards. So if you have the April or May (or newer) rollup updates installed, you don't need (and won't have installed) the specific KB-number linked to the MS17-010 patch.

However, if you've elected to install only security-only updates, then you will specifically need to have the March one installed. Unless you've specifically chosen this path, you should be on the rollups. Safest bet is just to let Windows update everything until it says it's up to date.

^{This is actually the case for all security patches now, not just this one.}

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will prevent WannaCry malware from installing/executing

The MS17-010 patch does nothing to stop the ransomware itself. If you download the exe and run it, it'll still do its thing and encrypt your files. For example, the primary infection vector on most networks was through email attachments, IIRC. This is nothing new for ransomware.

However, the worm portion of the program is what facilitates its spread through networks. This attacks the SMBv1 implementation on the destination computer, i.e. the computer the worm is spreading to, not from.. Therefore, the MS17-010 patch must be installed every Windows machine on the network.

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Generally, NAT or firewalls at the network edge prevent spread through the internet.

just prevent the malware (once installed on a certain PC and therefore infecting it) from propagating through the intranet

The patch does nothing to help an already-infected computer. It's only useful if installed on the other non-infected computers on the network.

are there any benefits of disabling SMBv1 too?

Not directly for WannaCry/EternalBlue, as the MS17-010 patch fixes this particular hole. However, defense in depth would suggest disabling SMBv1 anyway unless you need it, as it reduces the attack surfaces and minimises damage should there be another currently-unknown SMBv1 bug. Given that Vista and newer support SMBv2, there should be no need to keep SMBv1 enabled unless you need to share files with XP. I hope that's not the case.

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before disabling SMBv1, how to be sure that this will not affect network performance/reliability?

The most obvious effect is you will no longer be able to use Windows file sharing with any XP systems.

As per the link grawity posted and the comments there, this might prevent your computer from showing up in or using the 'network' list. You can still access them by typing in the computername and see them listed using homegroups (or Active Directory in a business environment).

The other exception as called out in that blog post is older network photocopiers/scanners that have 'scan to share' functionality might not support a modern SMB protocol.

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