Category Archives: Vulnerability

Microsoft Patch Tuesday March 2020: a new record was set, SMBv3 “Wormable” RCE and updates for February goldies

SMBv3 “Wormable” RCE

Without a doubt, the hottest Microsoft vulnerability in March 2020 is the “Wormable” Remote Code Execution in SMB v3 CVE-2020-0796. The most commonly used names for this vulnerability are EternalDarkness, SMBGhost and CoronaBlue.

Microsoft Patch Tuesday for March 2020: a new record was set, SMBv3  "Wormable" RCE and updates for February goldies

There was a strange story of how it was disclosed. It seems like Microsoft accidentally mentioned it in their blog. Than they somehow found out that the patch for this vulnerability will not be released in the March Patch Tuesday. So, they removed the reference to this vulnerability from the blogpost as quickly as they could.

But some security experts have seen it. And, of course, after EternalBlue and massive cryptolocker attacks in 2017, each RCE in SMB means “OMG, this is happening again, we need to do something really fast!” So, Microsoft just had to publish an advisory for this vulnerability with the workaround ADV200005 and to release an urgent patch KB4551762.

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Microsoft Patch Tuesday February 2020

IMHO, these are the two most interesting vulnerabilities in a recent Microsoft Patch Tuesday February 2020:

  • Mysterious Windows RCE CVE-2020-0662. “To exploit the vulnerability, an attacker who has a domain user account could create a specially crafted request, causing Windows to execute arbitrary code with elevated permissions.” Without needing to directly log in to the affected device!
  • Microsoft Exchange server seizure CVE-2020-0688. By sending a malicious email message the attacker can run commands on a vulnerable Exchange server as the system user (and monitor email communications). “the attacker could completely take control of an Exchange server through a single e-mail”.

There were also RCEs in Remote Desktop (Client and Service), a third attempt to fix RCEs in Internet Explorer, Elevation of Privilege, etc. But all this stuff we see in almost every Patch Tuesday and without fully functional exploits it’s not really interesting. 🙂

Read the full reviews in Tenable and Zero Day Initiative blogs.

Big Microsoft day: EOL for Win7, Win2008 and crypt32.dll

Big Microsoft day. End-of-life for Windows 7 desktops and Windows 2008 servers (strictly speaking Windows Server 2008 R2). I think that today many security guys had a fun task to count how many host hosts with win7 and win2008 they still have in the organization. So, Asset Management is a necessity! 🙂

Windows 7 desktop

Now an interesting time should begin, when critical unpatched vulnerabilities may appear for these operation systems. At the same time, the number of hosts with Windows 7 and Windows 2008 will be still big enough for massive attacks. 😈 Although I think that Microsoft will continue to release patches for the most critical vulnerabilities, like they did it for WinXP. Upd. Also note, that for Windows Server 2008/2008r2 it’s also possible to purchase an extended three years  security update subscription.

Windows 2008 server

The second interesting topic is the mysterious vulnerability in crypt32.dll (this dll appeared in Windows more than 20 years ago), which might somehow affect authentication and digital signatures in Windows.

crypt32.dll

Far now it has been only a rumor, but soon it will become clear how dangerous it is and how it can be used.

upd. 15.01. So, what about this vulnerability in crypt32.dll. Now it has the name NSACrypt (because NSA reported it) and the id CVE-2020-0601. It’s not for all versions of Windows, only for Windows 10, Windows Server 2016 and Windows Server 2019.

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0day RCE in Firefox

This seems like a pretty interesting vulnerability CVE-2019-17026 in Firefox (and Thunderbird) in Windows, MacOS and Linux.

A pretty interesting vulnerability in  Firefox  (and Thunderbird)

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw”.

US-cert informs us that “an attacker could exploit this vulnerability to take control of an affected system“. Yep, it’s RCE.

On the one hand, it’s not a big deal, because Firefox will ask you to update it after the next launch.

Firefox will ask you to update it after the next launch

But if somewhere in your organization the old version of Firefox is used because it is the only version that is supported by some legacy application or plugin, you are in hell. Of course, this old browser may be only installed somewhere and not used, but still try to monitor this and take care. Especially if you use some custom Firefox-based build.