Tag Archives: Tenable.io

Vulnerability Management for Network Perimeter

Network Perimeter is like a door to your organization. It is accessible to everyone and vulnerability exploitation does not require any human interactions, unlike, for example, phishing attacks. Potential attacker can automate most of his actions searching for an easy target. It’s important not to be such of target. ūüėČ

Vulnerability Management for Network Perimeter

What does it mean to control the network perimeter? Well, practically this process consist of two main parts:

  • Assessing network hosts that are facing Internet using some Network Scanner (Nessus, OpenVAS, Qualys, MaxPatrol. F-Secure Radar, etc.)
  • Assessing application servers, e.g. Web Servers, on these hosts using some special tools, e.g. Web Application Scanners (Acunetix, Burp Suite, Qualys WAS, Tenable.io WAS, High-Tech Bridge ImmuniWeb, etc.)

Active scanning is a good method of perimeter assessment. Dynamics of the assets is relatively low, comparing with the Office Network. Perimeter hosts usually stays active all the time, including the time when you are going to scan scanning them. ūüėČ

Most of the dangerous vulnerabilities can be detected without authorization: problems with encryption (OpenSSL Heartbleed, Poodle, etc.). RCE and DoS of web servers and frameworks (Apache Struts and Equifax case)

The best results can be achieved with scanners deployed outside of your network. Thus, you will see your Network Perimeter the same way a potential attacker sees it. But certainly, you will be in a better position:

  • You can ask your IT administrators to add your network and WAS scanners in white list, so they will not be banned.
  • You can check and correlate scan results of remote scanner with (authenticated?) scan results produced by the scanner deployed in your organization’s network and thus filtering false positives.

What about the targets for scanning? How should you get them?

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Study Vulnerability Assessment in Tenable University for free

Not so long ago, Tenable presented renewed online training platform РTenable University. It is publicly available even for non-customers, for example, for Nessus Home users. However, not all courses are available in this case.

Login screen

I decided to check it out, registering as non-customer.

Sign up

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Carbon Blacking your sensitive data it’s what the agents normally do

But usually without such consequences. In this situation with Carbon Black, I am most interested in the actual reasons of all this media noise. From what point business as usual becomes a scandal. Ok, when you see Carbon Black customer’s private files in public access at Virus Total it’s a 100% epic fail.¬†But what about other options.

Carbon Black and DirectDefense Illustration from investigation by DirectDefense 

  1. Agent makes file analysis by himself on user’s host. It’s probably ok. Some paranoid person, like me, may say that it’s possible that data may leak during the update process, like in case of M.E.Doc. But it probably can be detected it in traffic somehow.
  2. Agent sends file to the¬†vendor’s cloud for further analysis in some private multiscanner. Vendor will have copy of your private data. What if this data will leak? Are you sure that vendor will bear responsibility for this?
  3. Agent sends file to vendor’s cloud, vendor than sends it to some third-party for analysis. Are you sure vendors that you use doesn’t do this? How can you investigate this? What will be your next actions if you figure out that they do it without your permission?
  4. Agent sends file to the vendor’s cloud, vendor then sends it to some third-party for analysis,¬†third-party opens access to this file for a wide range of people.

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My comments on Forrester’s “Vulnerability Management vendor landscape 2017”

A top consulting company, Forrester Research, recently published report “Vendor Landscape: Vulnerability Management, 2017“. You can read for free by filling a small form on Tenable web site.

Forrester Vendor Landscape: Vulnerability Management, 2017

What’s interesting in this document? First of all,¬†Josh Zelonis and co-authors presented their version of VM products¬† evolution. It consists of this steps (I have reformulated them a bit for the copyright reasons) :

  1. Initial fear of automated vulnerability assessment tools
  2. Mid-1990s and first productized offerings
  3. Authenticated scanning dramatically improved accuracy of scans
  4. Application scanning (DAST)
  5. Security assessment of software containers and DevOps in general.

As you see, the last one is about containerization. And it is now presented only in Tenable.io/FlawCheck. ūüėČ

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CISO Forum 2017

Last week I have attended CISO Forum 2017 in Moscow.

CISO FORUM 2017: Austere weekdays of CISO

I was talking there about “Vulnerability Quadrants: automated hot topic detection in public vulnerability (CVE) flow“. Today I want to share my impressions about the forum itself.

Vulnerability Quadrants: automated hot topic detection in public vulnerability (CVE)

To be short, I liked it very much. Both exhibition and presentations.

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