Tag Archives: Microsoft

Vulristics Command Line Interface, improved Product & Vuln. Type Detections and Microsoft Patch Tuesday November 2021

Hello everyone! In this episode I want to highlight the latest changes in my Vulristics project. For those who don’t know, this is a utility for prioritizing CVE vulnerabilities based on data from various sources.. Currently Microsoft, NVD, Vulners, AttackerKB.

Command Line Interface

I started working on the CLI for Vulristics. Of course, it is not normal to edit scripts every time to release a report.

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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.

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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.

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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.

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Last Week’s Security News: Black Hat Pwnie Awards, iPhone Checks Photos, Evil Windows Print Server, Cisco VPN Routers Takeovers

Hello everyone! Last Week’s Security News, August 1 – August 8.

Black Hat Pwnie Awards

Last week was more quiet than normal with Black Hat USA and DEF CON security conferences. I would like to start with the Pwnie Awards, which are held annually at Black Hat. It’s like an Oscar or Tony in the information security world. Pwnie Awards recognizes both excellence and incompetence. And, in general, is a very respectable, adequate and fun event.

There were 10 nominations. I will note a few.

  • Firstly 2 nominations, which were received by the guys from Qualys.
    Best Privilege Escalation Bug: Baron Samedit, a 10-year-old exploit in sudo.
    Most Under-Hyped Research: 21Nails, 21 vulnerabilities in Exim, the Internet’s most popular mail server.
  • Best Server-Side Bug: Orange Tsai, for his Microsoft Exchange Server ProxyLogon attack surface discoveries.
  • Most Epic Fail: Microsoft, for their failure to fix PrintNightmare.
  • Best Song: The Ransomware Song by Forrest Brazeal
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Last Week’s Security news: Serious Sam in Metasploit, PetitPotam, Zimbra Hijack, Joint Advisory TOP30 CVEs

Hello everyone! Last Week’s Security News, July 26 – August 1.

Serious Sam in Metasploit

Last week I talked about the Serious Sam vulnerability (CVE-2021-36934), also known as HiveNightmare. The name HiveNightmare comes from the fact that Windows stores its registry data in a small number of proprietary database files called hives. Due to mismanagement of SAM and SYSTEM hives in Windows 10, it is possible for an unprivileged user to read those files and then, for example, extract the account password hashes. An exploit for this vulnerability is now available in Metasploit and it will be much easier for attackers to exploit this vulnerability. The issues is still under investigation by Microsoft and a patch is not currently available, only the list of vulnerable OS versions, however a workaround has been provided.

PetitPotam

At the beginning of last week, PetitPotam (Little Hippo) attack made a lot of noise. It could force remote Windows systems to reveal password hashes that could then be easily cracked.

“The PetitPotam bug is tied to the Windows operating system and the abuse of a remote access protocol called Encrypting File System Remote Protocol (MS-EFSRPC). The protocol is designed to allow Windows systems to access remote encrypted data stores, allowing for management of the data while enforcing access control policies. […]
The PetitPotam PoC is a form of manipulator-in-the-middle (MitM) attack against Microsoft’s NTLM authentication system. Next, an attacker uses the file-sharing protocol Server Message Block (SMB) to request access to a remote system’s MS-EFSRPC interface. According to [security researcher Gilles Lionel], this forces the targeted computer to initiate an authentication procedure and share its authentication details via NTLM.

In response to the public availability of the PoC, Microsoft was quick to respond, outlining several mitigation options. For starters, Microsoft recommends disabling NTLM authentication on Windows domain controllers. It also suggests enabling the Extended Protection for Authentication (EPA) feature on AD CS services.”

But there won’t be any special fix. Microsoft: “PetitPotam is a classic NTLM Relay Attack, and such attacks have been previously documented by Microsoft along with numerous mitigation options to protect customers.”

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My thoughts on the “2021 Gartner Market Guide for Vulnerability Assessment”. What about the quality?

The Gartner Vulnerability Management Reports are one of the few marketing reports that I try to read regularly. This started back in the days when I was working for a VM vendor doing competitive analysis. Gartner is one of the few organizations that think about Vulnerability Assessment and Vulnerability Management and clearly articulate where we are and where we are going.

I got a free reprint of “2021 Gartner Market Guide for Vulnerability Assessment” from the Tenable website. Thanks a lot to them for that.

Let’s start with what I liked:

  1. It’s great that Gartner has made vulnerability prioritization technology (VPT) a separate class of solutions, that do not detect vulnerabilities themselves, but work with them. For example, Kenna or my Vulristics. And it could be additional functionality like Tenable VPR.
  2. I liked the focus on EDR as a promising VM replacement. Especially, Microsoft solutions (Defender for Endpoint or as was mentioned in the report Microsoft’s Threat & Vulnerability Management, TVM).
  3. It’s nice that various areas related to Vulnerability Management have been mentioned: Pentest, Bug Bounty, Breach and Attack Simulation (BAS).
  4. An interesting diagram that shows that VA is primarily about “Assess” and “Asset Management”, VPT is primarily about “Prioritize” and “Workflow Management”, BAS is primarily about “Compensate” and “Security Controls”.

Now what I didn’t like. I have one pain point – the quality of the scanning. And here, on the one hand, something was said, but on the other, it was not enough and not as definite as I would like. Market Direction is the most interesting section of the document. And it was the most painful to read.

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