This is the result of testing a part or module obtained from rework or service of a product.
You can also build up a picture of the Attack Surface by scanning the application. Some web application firewalls WAFs may also be able to export a model of the appliaction's entry points.
Validate and fill in your understanding of the Attack Surface by walking through some of the main use cases in the system: Follow the flow of control and data through the system, see how information is validated and where it is stored, what resources are touched and what other systems are involved.
Fill in the holes as you dig deeper in a security analysis, or as you work more with the application and realize that your understanding of the Attack Surface has improved. Focus on remote entry points — interfaces with outside systems and to the Internet — and especially where the system allows anonymous, public access.
Network-facing, especially internet-facing code Web forms Files from outside of the network Backwards compatible interfaces with other systems — old protocols, sometimes old code and libraries, hard to maintain and test multiple versions Custom APIs — protocols etc — likely to have mistakes in design and implementation Security code: Then understand what compensating controls you have in place, operational controls like network firewalls and application firewalls, and intrusion detection or prevention systems to help protect your application.
Using this method you calculate an overall attack surface score for the system, and measure this score as changes are made to the system and to how it is deployed. Note that deploying multiple versions of an application, leaving features in that are no longer used just in case they may be needed in the future, or leaving old backup copies and unused code increases the Attack Surface.
Backups of code and data - online, and on offline media - are an important but often ignored part of a system's Attack Surface. Protecting your data and IP by writing secure software and hardening the infrastructure will all be wasted if you hand everything over to bad guys by not protecting your backups.
Managing the Attack Surface Once you have a baseline understanding of the Attack Surface, you can use it to incrementally identify and manage risks going forward as you make changes to the application.
What are you doing different?
What holes could you have opened? Each of these incremental changes is more of the same, unless you follow a new design or use a new framework.
If you add another web page that follows the same design and using the same technology as existing web pages, it's easy to understand how much security testing and review it needs.
If you add a new web services API or file that can be uploaded from the Internet, each of these changes have a different risk profile again - see if if the change fits in an existing bucket, see if the existing controls and protections apply. If you're adding something that doesn't fall into an existing bucket, this means that you have to go through a more thorough risk assessment to understand what kind of security holes you may open and what protections you need to put in place.
Changes to session management, authentication and password management directly affect the Attack Surface and need to be reviewed. So do changes to authorization and access control logic, especially adding or changing role definitions, adding admin users or admin functions with high privileges.
Similarly for changes to the code that handles encryption and secrets. Fundamental changes to how data validation is done. And major architectural changes to layering and trust relationships, or fundamental changes in technical architecture — swapping out your web server or database platform, or changing the run-time operating system.
As you add new user types or roles or privilege levels, you do the same kind of analysis and risk assessment. Overlay the type of access across the data and functions and look for problems and inconsistencies. It's important to understand the access model for the application, whether it is positive access is deny by default or negative access is allow by default.
In a positive access model, any mistakes in defining what data or functions are permitted to a new user type or role are easy to see. Normally, an application's Attack Surface will increase over time as you add more interfaces and user types and integrate with other systems. You also want to look for ways to reduce the size of the Attack Surface when you can by simplifying the model reducing the number of user levels for example or not storing confidential data that you don't absolutely have toturning off features and interfaces that aren't being used, by introducing operational controls such as a Web Application Firewall WAF and real-time application-specific attack detection.Foundation Series: Software Process (Waterfall Process versus Incremental Process) January 3, Foundation series, Process Improvement, Requirements, Software development Scott Sehlhorst A software process is .
What is diffrence between iterative model and waterfall model?Explain What is the diffrence bet.. Answer / asha salaama In a waterfall model no feedback path to the proceeding phases of the Software Development Life Cycle.
Process metrics assess the effectiveness and quality of software process, determine maturity of the process, effort required in the process, effectiveness of defect removal during development, and so on.
What is difference between iterative model, incremental model and agile model? Update Cancel. Answer Wiki. What is the difference between an iterative model an incremental model?
Incremental Model - The Waterfall Model is a traditional incremental development approach. The stages (Initite,plan,develop,monitor,close) increment after . The slow and cumbersome Waterfall model evolved into Agile which saw development teams working on the software in short sprints lasting not more than two heartoftexashop.com such a short release cycle helped the development team work on client feedback and incorporate it along with bug fixes in the next release.
An entity–relationship model (ER model for short) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between instances of those entity types.