Security News: Microsoft Patch Tuesday October 2021, Autodiscover, MysterySnail, Exchange, DNS, Apache, HAProxy, VMware vCenter, Moodle

Hello everyone! This episode will be about relatively recent critical vulnerabilities. Let’s start with Microsoft Patch Tuesday for October 2021. Specifically, with the vulnerability that I expected there, but it didn’t get there.

Autodiscover leak discovered by Guardicore Labs

“Autodiscover, a protocol used by Microsoft Exchange for automatic configuration of clients such as Microsoft Outlook, has a design flaw that causes the protocol to “leak” web requests to Autodiscover domains outside of the user’s domain but in the same TLD (i.e. Autodiscover.com).” Guardicore Labs acquired multiple Autodiscover domains and have captured 372,072 Windows domain credentials in total. It seems Microsoft have chosen to ignore this issue. No CVE, no Outlook or ActiveSync patches. The only fix is to ban the “Autodiscover.” domains on devices.

Microsoft Patch Tuesday for October 2021

74 vulnerabilities: 1 Critical, 30 High, 43 Medium.

Elevation of Privilege – Windows Kernel (CVE-2021-40449)

It is a use-after-free vulnerability in the NtGdiResetDC function of the Win32k driver. A detailed technical description is available in Kasperky Securelist post, but, in short, the vulnerability can lead to leakage of kernel module addresses in the computer’s memory. This vulnerability is being exploited in the wild by APT MysterySnail. All servers and desktops should be updated.

Continue reading

Career Navigator talk for IT Hub College

Last week I gave a “Career Navigator” talk for the students of the IT Hub College in Moscow. By the way, this college has a very interesting practical information security program. If it is relevant for you, check it out.

I’ve never talked so much about myself in public. It was like giving advises to yourself from the past. An interesting experience. It took about an hour and a half. And now I will try to mention the main points.

University

I talked about studying at the university. The fact that we go to university to gain knowledge and skills. But this is not the only reason. The university diploma makes it easier to find a job and participate in emigration programs if you ever want to. For example, this is a requirement for a for the European Blue Card. Networking at the university is also important.

My experience of studying at Bauman Moscow State Technical University was definitely positive. Although I believe that there could be more practical courses on Operating Systems, networking and programming. On the other hand, there could be much less mathematics. I have the best memories from the Theoretical Foundations of Information Security course and the course based on CISSP exam.

Continue reading

Security News: Microsoft Patch Tuesday September 2021, OMIGOD, MSHTML RCE, Confluence RCE, Ghostscript RCE, FORCEDENTRY Pegasus

Hello everyone! This time, let’s talk about recent vulnerabilities. I’ll start with Microsoft Patch Tuesday for September 2021. I created a report using my Vulristics tool. You can see the full report here.

The most interesting thing about the September Patch Tuesday is that the top 3 VM vendors ignored almost all RCEs in their reviews. However, there were interesting RCEs in the Office products. And what is most unforgivable is that they did not mention CVE-2021-38647 RCE in OMI – Open Management Infrastructure. Only ZDI wrote about this.

Continue reading

Microsoft Defender for Endpoint: The Latest Versions of Antivirus Engine & Signatures

In a previous episode on Microsoft Defender for Endpoint, I described how to get a list of antivirus engine and signatures versions for the hosts in your infrastructure using the Microsoft Graph API. But the problem remains. You know the versions that are currently installed on the hosts. But where can you get the latest versions that should be installed there?

I haven’t found any pretty solution for this. I parse public html pages on the Microsoft site I’ll show you how I do it. If you know something better, please write in the comments.

Continue reading

Security News: Exchange ProxyShell, Zoom RCE, Citrix Canceled PT Acknowledgments, Cisco No Patch Router RCEs

Hello everyone! This is a new episode with my comments on the latest Information Security news.

Exchange ProxyShell

I want to start with something about attacks on Exchange. ProxyShell is in the news, the LockFile ransomware compromised more than 2000 servers. On the other hand, there is basically nothing to say here.

ProxyShell is the name for 3 vulnerabilities. The bulletins for Remote Code Execution CVE-2021-34473 and Server Elevation of Privilege CVE-2021-34523 were released on July 13, but were fixed by April Patch Tuesday patches. Yes, it happens sometimes. The bulletin for Security Feature Bypass CVE-2021-31207 was released on May 11. Users had 4 months to install the updates. Interestingly, 2 out of 3 vulnerabilities have the property “Less likely to be exploited”. As you can see, it’s pretty useless.

Continue reading

Security News: Microsoft Patch Tuesday August 2021, Phishers Started Using reCAPTCHA, Scan 1 IP and Go to Jail

Hello everyone! Yet another news episode.

Microsoft’s August Patch Tuesday

Let’s start with Microsoft’s August Patch Tuesday. I think the most interesting thing is that it contains a fix for the PetitPotam vulnerability. I talked about this vulnerability two weeks ago. At the time, Microsoft had no plans to release a patch because PetitPotam was a “classic NTLM Relay Attack”. But the patch was actually released as part of August Patch Tuesday.

A quote from Rapid7: “Tracked as CVE-2021-36942, the August 2021 Patch Tuesday security update blocks the affected API calls OpenEncryptedFileRawA and OpenEncryptedFileRawW through the LSARPC interface”.

There are no formal signs that this vulnerability is critical other than comments from the vendors. My Vulristics tool has flagged this “Windows LSA Spoofing” as a Medium level Vulnerability. But this fix seems to be the most important thing in this Patch Tuesday. So install this patch first.

Continue reading

How to get Antivirus-related Data from Microsoft Defender for Endpoint using Intune and Graph API

Hello everyone! In this episode, I would like to tell you how I tried to get automatically antivirus-related data (current status, engine and signature version, last full scan date) from Microsoft Defender for Endpoint using Microsoft Intune and the Graph API.

Why is this necessary?

You might assume that if the Defender for Endpoint agent is installed on the host, everything should be fine automatically. But in fact, the antivirus engine and signature versions may be outdated, real-time protection may be disabled. And so all this needs to be monitored.

Grapf API

This will be the third episode about Microsoft Enterprise Security APIs. The first was about Defender and Defender API, the second was about Intune and the Intune API. And today I’m going to talk about the Grapf API, which should probably replace all the other APIs and should be more logical and easier. Although in my opinion it is even strangier and poorly documented. I didn’t like it.

Continue reading