PCI Scan and Qualys Vulnerability Scanning Service Tips and Tricks

PCI DSS v3.0 Scanning Requirements

Quartely External Vulnerabibility scans via ASV:  

Scans of public-facing web applications and review detected vulnerabilities

Per PCI DSS v3.0 requirement 6.6, merchants are required to perform scans of public-facing web
applications and review detected vulnerabilities. Using the PCI module you can meet the web
application scans requirement. Note that web application scanning is available when this option is
turned on for your subscription. Please contact your Account Manager or our Support Team if you
would like to use this option.

Qualys PCI Compliance Scan

1. Define Your In-Scope Assets Using Asset Wizard

Important! The wizard prompts you to confirm scans can be performed without interference. The service provides multiple scanners for external (perimeter) scanning and lists the scanner IP addresses.
Depending on your network, it may be necessary to add the scanner IPs to your list of trusted IPs.

Using ASV Vulnerability Scan for PCI Audits

Note: https://www.tenable.com/blog/can-i-use-nessus-to-perform-pci-audits

There is no product solution available on the market today that can be purchased and used to perform accredited PCI vulnerability audits. There are services which can be procured to perform vulnerability audits and some of the technology these services use is available in the form of a product.

For an organization attempting to navigate the requirements of PCI, the differences between buying a service and the product based on that service may not seem great. For example, many scanning services include an appliance which is deployed on a customer's network which gives the feeling of a product.

If an organization governed by the PCI regulation does buy a product solution to perform PCI scanning, that organization will still be required to procure a 3rd party service to perform certified PCI vulnerability scanning. These services must be acquired from an Approved Scanning Vendor.

The benefit of buying a product that can perform realistic PCI audits is that when your official quarterly PCI scan is performed, you won't be surprised and you will have had a chance to fix issues before your audit occurs. Also, if your scanning service makes an error or has inaccurate results, being able to compare their results with your own can help expedite any incorrectly reported issues.

Differences between in-house and Remote Scanning

There are also some very stark differences between remote PCI vulnerability assessments and what can be done with an in-house tool.

For example, section 8.5.9 of the PCI Audit Procedures document specifies that user passwords should be changed every 90 days. This sort of setting is something that can be audited with the Nessus Direct Feed and Tenable has even written specific PCI audit polices to look for this setting on UNIX and Windows operating systems. However, section 8.5.9 also gives MSPs some latitude in performing these audits and there are allowances for manual review of polices.

There are many more examples of this sort of discrepancy. Searching for the term "For Service Providers Only" in the audit guidelines will show many examples where a full internal PCI audit can be replaced with manual procedural reviews.

If such a review only occurs manually and quarterly, then when violations are found, fixing them implies not only changing the settings on various servers, but also changing the procedures and policies which allowed these lapses to occur in the first place. Performing in-house automated checks allows for early detection of compliance violations.

Another advantage of in-house scanning is that you may chose to perform a credentialed patch audit with Nessus. Patch audits  are very accurate and work for Windows and UNIX operating systems. If your MSP or ASV is not using credentials to audit your systems, it is possible that their scans may be less accurate than ones with credentials. If this is the case, performing these scans in-house with credentials can help expedite any issues reported by your ASV that are not accurate.

11.2.1 Perform quarterly internal vulnerability scans. Address vulnerabilities and perform rescans to verify all “high risk” vulnerabilities are resolved in accordance with the entity’s vulnerability ranking (per Requirement 6.1). Scans must be performed by qualified personnel.

For internal scans you could use Nessus as long as you have documented procedures and the personnel are "qualified."

11.2.2 Perform quarterly external vulnerability scans, via an Approved Scanning Vendor (ASV) approved by the Payment Card Industry Security Standards Council (PCI SSC). Perform rescans as needed, until passing scans are achieved.

For external scans, the scanning must be performed by an approved scanning vendor (ASV). You can find the list of ASVs at https://www.pcisecuritystandards.org/assessors_and_solutions/approved_scanning_vendors.  Tenable ( Jus like Qualys or other ASVs) certainly do offer ASV scanning as part of their product set, which seems a fairly straightforward statement that you can use Nessus as part of your PCI testing.

Uninstall Cloud Agent / Recycle Related Licenses

Assetview & Tags

1.1 Dashboard

Some customized widgets :

• Authentication Failed Assets : vulnerabilities.vulnerability.qid:105015 or vulnerabilities.vulnerability.qid:105053 or vulnerabilities.vulnerability.qid:105296 or vulnerabilities.vulnerability.qid:105297
  
• Not Found 90 Days Assets : not tags.name:"Found in 90 days" and activatedForModules:"VM"
• Tag Rule:

• OS Not Identified Assets: not operatingSystem: "windows" and not operatingSystem: "HP" and not operatingSystem: "Ricoh" and not operatingSystem: "Linux" and not operatingSystem: "VMware" and not operatingSystem: "Xerox" and not operatingSystem: "Cisco" and not operatingSystem: "Power Supply"

YouTube Video: Using Qualys Free Community Edition to Scan Home Network

1.2 Tags

Asset Search - Dynamic Rule
Search all assets found / scanned in last 90 days:

<?xml version="1.0" encoding="UTF-8"?>
<TAG_CRITERIA>
 <LAST_SCAN_DATE>
  <SEARCH_TYPE>WITHIN</SEARCH_TYPE>
  <DAYS>90</DAYS>
 </LAST_SCAN_DATE>
</TAG_CRITERIA>

Enable Agentless Tracking

To reduce / suppress the duplicated assets because of dhcp, one of effective methods is to enable agentless tracking.

2.1. VM > Scans > Setup > Agentless Tracking > Accept

2.2. VM > Scans > Authentication > Edit [Your Authentication Record] > Login Credentials > "Enable Agentless Tracking"

2.3. VM > Users > Setup > Cloud Agent Setup > "Show unified view of hosts"

Note: QID 45179 for successfully checked tracking
QID 45180 - for failed

Change IP Tracked Host Assets to DNS Tracking

Qualys provides multiple mechanisms for tracking assets in your environment; IP, DNS, NetBIOS, Agent, and EC2. In Qualys IP tracking is the default mechanism. DNS and NetBIOS tracking are most useful for DHCP networks.

Note:

• Qualys Article Number: 000002856
• Understanding IP, DNS, and NetBIOS Tracking and Scan by Hostname
• Change IP tracking method from IP to DNS, it will require to remove all hosts assets. Basically remove all assets then start it from beginning. It will also bring one small issue to those DNS hostname could not be resolved. 

Issues with DNS tracking:
If you have some hosts which DNS hostname could not be resolved by your DNS servers, they will not be scanned. Here is a screenshot for those DNS hostname could not be resolved.
Solution:
You will need to manually change them from DNS tracking to IP tracking.

4.1 Manual Purge
The idea is to find all assets not scanned in last 90 days then purge them all.

4.2 Automatically Purge
From your Scans -> Option Profiles, enable the option to Close Vulnerabilities on Dead Hosts.

Delete Older / Obsolete Assets

• Create an asset group called “ToBeDeleted”
• Add all available IP’s in your subscription to it and save the AG
• Now go to Asset search
• Run an Asset search on the AG “ToBeDeleted”. Just select the AG and hit search. This returns a list of All IP’s in your subscription that has been scanned at-least once. (If it has been scanned at-least once, it isn't a dead host). You may modify this search to suit your meaning of "Dead host"
• On this asset search result, select all IP’s and select “Launch a scan” (Don't run the scan, just hit launch) option from the action menu
• In the Launch Vulnerability scan window, copy the target IP range
• Now go back to the Asset group tab and select to edit the Asset group you created called the “ToBeDeleted”
• In the Edit AG window, go to the IP’s tab, click Manually.
• In the manual entry IP window, paste the range you have copied and click “Remove"
• Now save your asset group again
• Delete or do whatever you want to do to the list of IP’s now in “ToBeDeleted"

Best Practice to Maintain Timely and Effective Qualys Report

from Qualys Community:

From Qualys Community