By Sushila Nair, Security Specialist, BT
In order to be PCI compliant It is required that customers scan their networks quarterly and for their external presence to be scanned by an Authorized Scanning Vendor program (ASV).
In 2011 the PCI Council changed the ASV program significantly. ASVs have always been required to conduct network security scanning against a test network with predefined vulnerabilities operated and configured by the PCI SSC. ASVs are expected to produce a sample report and document all of the predefined vulnerabilities.
Authorized scanning vendors were, however, criticized for not always understanding their role or being able to advise their customers appropriately, especially in the scoping arena and on how to best identify and eliminate false positives.
So, last March the PCI SSC changed the program to require that ASVs have at least two qualified ASV employees who have done the online training program and passed a multiple choice exam. The training program ensures that the authorized personnel doing the scan are not only able to do the scan but understand the PCI DSS standards and are able to act as a trusted advisor to the customer in the area of vulnerability management, much like QSA act within the security control audits.
The objective is to bring a consistent understanding on how to evaluate network segmentation and really understand the requirements of the standard. ASV organizations are also required to have a quality assurance process in place to ensure that the reports produced, and the analysis of the results, are consistent and accurate.
The requirement for a QA program to be in place has been a requirement for QSA organizations for some time. The scan customer is ultimately responsible for defining the appropriate scope of the external vulnerability scan and must provide all Internet-facing IP Addresses and/or ranges to the ASV. If an account data compromise occurs via an externally facing system component not included in the scan, the scan customer is responsible. It is critical to work with an ASV that works as a trusted advisor, scoping is a critical components in being compliant and often merchants are confused about which systems are in scope for external scans. The ASV should be able to advise on not only which systems are in scope but also how to handle anomalies and systems that are failing the scan.
Organizations that are not guided by PCI but are conducting vulnerability scans as part of best practices or other regulatory requirements would be well advised to use the ASV certification as a method of being able to select a good scanning vendor. The fact that the vendor has passed exams, has qualified staff on board and has a QA process in house and this has been validated makes a great screening process and is a definite indicator that the organization would meet the needs of any organizations concerned about vulnerability management.

