Tag Archives: Exchange

Vulristics: Microsoft Patch Tuesdays Q2 2021

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Vulristics: Microsoft Patch Tuesdays Q2 2021. Hello everyone! Let’s now talk about Microsoft Patch Tuesday vulnerabilities for the second quarter of 2021. April, May and June. Not the most exciting topic, I agree. I am surprised that someone is reading or watching this. For me personally, this is a kind of tradition. Plus this is an opportunity to try Vulristics in action and find possible problems. It is also interesting to see what VM vendors considered critical back then and what actually became critical. I will try to keep this video short.

First of all, let’s take a look at the vulnerabilities from the April Patch Tuesday. 108 vulnerabilities, 55 of them are RCEs. Half of these RCEs (27) are weird RPC vulnerabilities. “Researcher who reported these bugs certainly found quite the attack surface”. The most critical vulnerability is RCE in Exchange (CVE-2021-28480). This is not ProxyLogon, this is another vulnerability. ProxyLogon was in March. And this vulnerability is simply related to ProxyLogon, so it is believed that it is exploited in the wild as well. In the second place this Win32k Elevation of Privilege (CVE-2021-28310). It is clearly mentioned in several sources as being used in real attacks. “Bugs of this nature are typically combined with other bugs, such as a browser bug or PDF exploit, to take over a system”. And the only vulnerability with a public exploit is the Azure DevOps Server Spoofing (CVE-2021-28459). Previously known as Team Foundation Server (​TFS), Azure DevOps Server is a set of collaborative software development tools. It is hosted on-premises. Therefore, this vulnerability can be useful for attackers.

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Vulristics: Microsoft Patch Tuesdays Q1 2021

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Vulristics: Microsoft Patch Tuesdays Q1 2021. Hello everyone! It has been 3 months since my last review of Microsoft vulnerabilities for Q4 2020. In this episode I want to review the Microsoft vulnerabilities for the first quarter of 2021. There will be 4 parts: January, February, March and the vulnerabilities that were released between the Patch Tuesdays.

I will be using the reports that I created with my Vulristics tool. This time I’ll try to make the episodes shorter. I will describe only the most critical vulnerabilities. Links to the full reports are at the bottom of the blog post.

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Vulristics Vulnerability Score, Automated Data Collection and Microsoft Patch Tuesdays Q4 2020

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Vulristics Vulnerability Score, Automated Data Collection and Microsoft Patch Tuesdays Q4 2020. In this episode I would like to make a status update of my Vulristics project. For those who don’t know, in this project I retrieve publicly available vulnerability data and analyze it to better understand the severity of these vulnerabilities and better prioritize them. Currently, it is mainly about Microsoft Patch Tuesday vulnerabilities, but I have plans to go further. Also in this episode I want to demonstrate the new Vulristics features on Microsoft Patch Tuesday reports for October, November and December 2020.

Vulristics Vulnerability Scores, automated data collection and Microsoft Patch Tuesday Q4 2020

Patch Tuesdays Automated Data Collection

First of all, I dealt with the annoying collecting of the data for Microsoft Patch Tuesdays reports. Previously it took pretty long time. I had to go to Microsoft website and search for CVE IDs. After that, I had to get the comments from various Vulnerability Management vendors and researchers blogs (Tenable, Qualys, Rapid7, ZDI). I wanted this to be as much automated as possible. I have added some code to make CVE search requests on the Microsoft website for a date range (including the second Tuesday of the month). I also figured out how to make searches on the Vulnerability Management vendors blogs. So, now to get a Microsoft Patch Tuesday report it’s only necessary to set the year and month.

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Microsoft Patch Tuesday September 2020: Zerologon and other exploits, RCEs in SharePoint and Exchange

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Microsoft Patch Tuesday September 2020: Zerologon and other exploits, RCEs in SharePoint and Exchange. I would like to start this post by talking about Microsoft vulnerabilities, which recently turned out to be much more serious than it seemed at first glance.

Older Vulnerabilities with exploits

“Zerologon” Netlogon RCE (CVE-2020-1472)

One of them is, of course, the Netlogon vulnerability from the August 2020 Patch Tuesday. It’s called “Zerologon”. I would not say that Vulnerability Management vendors completely ignored it. But none of them (well, maybe only ZDI) emphasized in their reports that this vulnerability would be a real disaster.

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Microsoft Patch Tuesday April 2020: my classification script, confusing RCE in Adobe Type Manager and updates for older vulnerabilities

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Microsoft Patch Tuesday April 2020: my classification script, confusing RCE in Adobe Type Manager and updates for older vulnerabilities. Making the reviews of Microsoft Patch Tuesday vulnerabilities should be an easy task. All vulnerability data is publicly available. Even better, dozens of reviews have already been written. Just read them, combine and post. Right?

Microsoft Patch Tuesday April 2020: my classification script, confusing RCE in Adobe Type Manager and updates for older vulnerabilities

Not really. In fact it is quite boring and annoying. It may be fun to write about vulnerabilities that were already used in some real attacks. But this is a very small part of all vulnerabilities. What about more than a hundred others? They are like “some vulnerability in some component may be used in some attack (or may be not)”. If you describe each of them, no one will read or listen this.

You must choose what to highlight. And when I am reading the reports from Tenable, Qualys and ZDI, I see that they choose very different groups of vulnerabilities, pretty much randomly.

My classification script

That’s why I created a script that takes Patch Tuesday CVE data from microsoft.com and visualizes it giving me helicopter view on what can be interesting there. With nice grouping by vulnerability type and product, with custom icons for vulnerability types, coloring based on severity, etc.

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

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

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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.