Category Archives: Topics

Vulristics: Beyond Microsoft Patch Tuesdays, Analyzing Arbitrary CVEs

Hello everyone! In this episode I would like to share an update for my Vulristics project.

For those who don’t know, in this project I am working on an alternative vulnerability scoring based on publicly available data to highlight vulnerabilities that need to be fixed as soon as possible. Roughly speaking, this is something like Tenable VPR, but more transparent and even open source. Currently it works with much less data sources. It mainly depends on the type of vulnerability, the prevalence of vulnerable software, public exploits and exploitation in the wild.

Elevation of Privilege - Windows Win32k

I started with Microsoft PatchTuesday Vulnerabilities because Microsoft provides much better data than other vendors. They have the type of vulnerability and the name of the vulnerable software in the title.

Elevation of Privilege - Windows Win32k MS site

But it’s time to go further and now you can use Vulristics to analyze any set of CVEs. I changed the scirpts that were closely related to the Microsoft datasource and added new features to get the type of vulnerability and name of the software from the CVE description.

Elevation of Privilege - Sudo (CVE-2021-3156) - High [595]
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My projects that are not related to Information Security: Yennysay TTS and PyTouchOk companion app

Thanks to the long New Year holidays in Russia, I had time to work on my own projects that are not related to information security. I released them on github and recorded short demos (by the way, Zoom is quite convenient for this! 😅).

Yennysay is a GUI text-to-speach tool that uses a free offline TTS engine in Windows 10. This was my first experience with Tkinter and it turned out to be quite successful. I use this tool a lot now. Yennysay can read English and Russian texts aloud, show progress, track clipboard, retrieve text from copied URL, open YouTube URL in SMPlayer, and so on.

Check out the video

and sources on github

PyTouchOk is also a Tkinter application for automating routine actions with GUI (similar to SikuliX and AutoIt). The idea was to create a companion app that would track the content of the screen and, under certain conditions, take control to perform routine actions. As an example of such a routine action, I implemented the export of slides from LibreOffice Impress in svg format via pyautogui by automatically clicking in the interface. This operation cannot be performed for all slides through the GUI, and LibreOffice API is quite difficult to work with. But the main goal was to create a companion app that could be easily expanded with new skills. And it succeeded, the program “understands” that LibreOffice Impress is open on the screen and starts automatic actions.
Here is the demo on youtube

аnd the sources on github.

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 August 2020: vulnerabilities with Detected Exploitation, useful for phishing and others

This time I would like to review not only the vulnerabilities that were published in the last August Microsoft Patch Tuesday, but also the CVEs that were published on other, not Patch Tuesday, days. Of course, if there are any.

But let’s start with the vulnerabilities that were presented on MS Patch Tuesday on August 11th. There were 120 vulnerabilities: 17 of them are Critical and 103 Important. My vulristics script could not find public exploits for these vulnerabilities on Vulners.com.

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Microsoft Patch Tuesday July 2020: my new open source project Vulristics, DNS SIGRed, RDP Client and SharePoint

I am doing this episode about July vulnerabilities already in August. There are 2 reasons for this. First of all, July Microsoft Patch Tuesday was published in the middle of the month, as late as possible. Secondly, in the second half of July I spent my free time mostly on coding. And I would like to talk more about this.

Microsoft Patch Tuesday July 2020: my new open source project Vulristics, DNS SIGRed, RDP Client and SharePoint

Vulristics

I decided to release my Microsoft Patch Tuesday reporting tool as part of a larger open source project (github). I named it Vulristics (from “Vulnerability” and “Heuristics”). I want this to be an extensible framework for analyzing publicly available information about vulnerabilities.

Let’s say we have a vulnerability ID (CVE ID) and we need to decide whether it is really critical or not. We will probably go to some vulnerability databases (NVD, CVE page on the Microsoft website, Vulners.com, etc.) and somehow analyze the descriptions and parameters. Right? Such analysis can be quite complex and not so obvious. My idea is to formalize it and make it shareable. It may not be the most efficient way to process data, but it should reflect real human experience, the things that real vulnerability analysts do. This is the main goal.

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Barapass, Tsunami scanner, vulnerabilities in Windows DNS Server and SAP products, weird attack on Twitter

This episode is based on posts from my Telegram channel avleonovcom, published in the last 2 weeks. So, if you use Telegram, please subscribe. I update it frequently.

Barapass, Tsunami scanner, vulnerabilities in Windows DNS Server and SAP products, weird attack on Twitter

Barapass update

I recently released an update to my password manager barapass. BTW, it seems to be my only pet project at the MVP stage, which I use every day. 😅

What’s new:

  1. Now I am sure that it works on Windows 10 without WSL. And you can run it beautifully even with the icon. 😊 Read more about installation in Windows in this file.
  2. Not only “copy the next value to the clipboard” (or “revolver mode” ) is now possible in the search results section. You can also get the previous value or copy the same value one again if it was somehow erased in the clipboard. Previously, I had to retype the search request each time to do this, and it was quite annoying. By the way, I unexpectedly discovered that the user input history inside the application magically works in the Windows shell (using up and down arrows) without any additional coding. On Linux it does not.
  3. You can set a startup command, for example, to decrypt the container.
  4. The startup command and quick (favorite) commands are now in settings.json and not hard-coded.
  5. settings.json, container files and decrypted files are now in “files” directory. It became more convenient to update barapass, just change the scripts in the root directory and that’s it. I divided the scripts into several files, now it should be more clear how it works.

So, if you need a minimalistic console password manager in which you can easily use any encryption you like – welcome! You can read more about barapass in my previous post.

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Microsoft Patch Tuesday June 2020: The Bleeding Ghost of SMB

This time, Microsoft addressed 129 vulnerabilities: 11 critical and 118 important. In fact, in the file that I exported from the Microsoft website, I saw 2 more CVEs (CVE-2020-1221, CVE-2020-1328) related to Microsoft Dynamics 365 (on-premises). But there is no information on them on the Microsoft website, in the MITRE CVE database and NVD. Does this mean that these CVE ids were mentioned unintentionally and related to some critical issues? I don’t think so, but this is strange.

This time there were no vulnerabilities with detected exploitation, so let’s start with the group “Exploitation more likely” according to Microsoft.

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