Assistance au développement et au test d'applications sécurisées

Ensuring the security of an application through its life cycle is a tedious task. The choice, the implementation and the evaluation of security solutions is difficult and error prone. Security skills are not common in development teams. To overcome the lack of security skills, developers and designers are provided with a plethora of documents about security problems and solutions (i.e, vulnerabilities, attacks, security principles, security patterns, etc.). Abstract and informal, these documents are provided by different sources, and their number is constantly growing. Developers are drown in a sea of documentation, which inhibits their capacity to design, implement, and the evaluate the overall application security. This thesis tackles these issues and presents a set of approaches to help designers in the choice, the implementation and the evaluation of security solutions required to overcome security problems. The problems are materialized by weaknesses, vulnerabilities, attacks, etc. and security solutions are given by security patterns.This thesis first introduces a method to guide designers implement security patterns and assess their effectiveness against vulnerabilities. Then, we present three methods associating security patterns, attacks, weaknesses, etc. in a knowledge base. This allows automated extraction of classifications and help designers quickly and accurately select security patterns required to cure a weakness or to overcome an attack. Based on this nowledge base, we detaila method to help designers in threat modeling and security test generation and execution. The method is evaluated and results show that the method enhances the comprehensibility and the accuracy of developers in the security solutions choice, threat modeling and in the writing of security test cases.Garantir la sécurité d’une application tout au long de son cycle de vie est une tâche fastidieuse. Le choix, l’implémentation et l’évaluation des solutions de sécurité est difficile et sujette a des erreurs. Les compétences en sécurité ne sont pas répondues dans toutes les équipes de développement. Afin de réduire ce manque de compétences en sécurité, les développeurs ont a leurs disposition une multitude de documents décrivant des problèmes de sécurité et des solutions requises (i.e., vulnérabilités, attaques, principes de sécurité, patrons sécurité, etc.). Abstraites et informelles, ces documents sont fournis par des sources différentes et leur nombre est en constante croissance. Les développeurs sont noyés dans une multitude de documents ce qui fait obstruction à leur capacité à choisir, implémenter et évaluer la sécurité d’une application. Cette thèse aborde ces questions et propose un ensemble de méthodes pour aider les développeurs à choisir, implémenter et évaluer les solutions de sécurité face aux problèmes de sécurité. Ces problèmes sont matérialisés par les failles, les vulnérabilités, les attaques, etc. et les solutions fournies par des patrons de sécurité. Cette thèse introduit en premier une méthode pour aider les développeurs dans l’implémentation de patrons de sécurité et l’estimation de leur efficacité face aux vulnérabilités. Puis elle présente trois méthodes associant les patrons de sécurité, les vulnérabilités, les attaques, etc. au sein d’une base de connaissance. Cette dernière permet une extraction automatique de classifications de patrons et améliore la rapidité et la précision des développeurs dans le choix des patrons de sécurité face à une vulnérabilité ou une attaque. En utilisant la base de connaissance, nous présentons une méthode pour aider les développeurs dans la modélisation des menaces ainsi que la générations et l’exécution des cas de test de sécurité. La méthode est évaluée et les résultats montrent que la méthode améliore l’efficacité, la compréhensibilité et la précision des développeurs dans le choix des patrons de sécurité et d’écriture des cas de test de sécurité

Assisting in secure application development and testing

Garantir la sécurité d’une application tout au long de son cycle de vie est une tâche fastidieuse. Le choix, l’implémentation et l’évaluation des solutions de sécurité est difficile et sujette a des erreurs. Les compétences en sécurité ne sont pas répondues dans toutes les équipes de développement. Afin de réduire ce manque de compétences en sécurité, les développeurs ont a leurs disposition une multitude de documents décrivant des problèmes de sécurité et des solutions requises (i.e., vulnérabilités, attaques, principes de sécurité, patrons sécurité, etc.). Abstraites et informelles, ces documents sont fournis par des sources différentes et leur nombre est en constante croissance. Les développeurs sont noyés dans une multitude de documents ce qui fait obstruction à leur capacité à choisir, implémenter et évaluer la sécurité d’une application. Cette thèse aborde ces questions et propose un ensemble de méthodes pour aider les développeurs à choisir, implémenter et évaluer les solutions de sécurité face aux problèmes de sécurité. Ces problèmes sont matérialisés par les failles, les vulnérabilités, les attaques, etc. et les solutions fournies par des patrons de sécurité. Cette thèse introduit en premier une méthode pour aider les développeurs dans l’implémentation de patrons de sécurité et l’estimation de leur efficacité face aux vulnérabilités. Puis elle présente trois méthodes associant les patrons de sécurité, les vulnérabilités, les attaques, etc. au sein d’une base de connaissance. Cette dernière permet une extraction automatique de classifications de patrons et améliore la rapidité et la précision des développeurs dans le choix des patrons de sécurité face à une vulnérabilité ou une attaque. En utilisant la base de connaissance, nous présentons une méthode pour aider les développeurs dans la modélisation des menaces ainsi que la générations et l’exécution des cas de test de sécurité. La méthode est évaluée et les résultats montrent que la méthode améliore l’efficacité, la compréhensibilité et la précision des développeurs dans le choix des patrons de sécurité et d’écriture des cas de test de sécurité.Ensuring the security of an application through its life cycle is a tedious task. The choice, the implementation and the evaluation of security solutions is difficult and error prone. Security skills are not common in development teams. To overcome the lack of security skills, developers and designers are provided with a plethora of documents about security problems and solutions (i.e, vulnerabilities, attacks, security principles, security patterns, etc.). Abstract and informal, these documents are provided by different sources, and their number is constantly growing. Developers are drown in a sea of documentation, which inhibits their capacity to design, implement, and the evaluate the overall application security. This thesis tackles these issues and presents a set of approaches to help designers in the choice, the implementation and the evaluation of security solutions required to overcome security problems. The problems are materialized by weaknesses, vulnerabilities, attacks, etc. and security solutions are given by security patterns.This thesis first introduces a method to guide designers implement security patterns and assess their effectiveness against vulnerabilities. Then, we present three methods associating security patterns, attacks, weaknesses, etc. in a knowledge base. This allows automated extraction of classifications and help designers quickly and accurately select security patterns required to cure a weakness or to overcome an attack. Based on this nowledge base, we detaila method to help designers in threat modeling and security test generation and execution. The method is evaluated and results show that the method enhances the comprehensibility and the accuracy of developers in the security solutions choice, threat modeling and in the writing of security test cases

A Practical Way of Testing Security Patterns

International audience—We propose an approach for helping developers devise more secure applications from the threat modelling stage up to the testing one. This approach relies on a Knowledge base integrating varied security data to perform these task. It firstly assists developers in the design of Attack Defense Trees (ADTrees) expressing the attacker possibilities to compromise an application and the defenses that may be implemented. These defenses are expressed by means of security patterns, which are generic and re-usable solutions to design secure applications. ADTrees are then used to guide developers in the generation of test cases and of LTL specifications encoding properties about security pattern behaviours. Test verdicts show whether an application is vulnerable to the attack scenarios and if the security pattern properties hold in the application traces

An Approach for Guiding Developers in the Choice of Security Solutions and in the Generation of Concrete Test Cases

International audienceThis paper tackles the problems of choosing security solutions and writing concrete security test cases for software, which are two tasks of the software life cycle requiring time, expertise and experience. We propose in this paper a method, based upon the notion of knowledge base, for helping developers devise more secure applications from the threat modelling step up to the testing one. The first stage of the approach consists of the acquisition and integration of publicly available security data into a data store. This one is used to assist developers in the design of attack-defense trees expressing the attacker possibilities to compromise an application and the defenses that may be implemented. These defenses are given under the form of security pattern combinations, a security pattern being a generic and reusable solution to design more secure applications. In the second stage, these trees are used to guide developers in the test case generation. Test verdicts show whether an application is vulnerable to the threats modelled by an ADTree and whether the consequences of the chosen security patterns are observed from the application (a consequence leading to some observable events partly showing that a pattern is correctly implemented). We applied this approach to web applications and evaluated it on 24 participants. The results are very encouraging in terms of the two criteria: comprehensibility and effectiveness

Using data integration to help design more secure applications

International audienceSecurity patterns are reusable solutions, which enable the design of maintainable systems or applications that have to meet security requirements. The generic nature of security patterns and their growing number make their choices difficult, even for experts in software design. We propose to contribute in this issue by presenting a methodology of security pattern classification based upon data integration. The classification exhibits relationships among 215 software attacks, 66 security principles and 26 security patterns. It expresses pattern combinations, which are countermeasures to a given attack. This classification is semi-automatically inferred by means of a data-store integrating disparate publicly available security data. Besides pattern classification, we show that the data-store can be used to generate Attack Defence Trees. In our context, these illustrate, for a given attack, its sub-attacks, steps, techniques and the related defences given under the form of security pattern combinations. Such trees make the pattern classification more readable even for beginners in security patterns

A catalogue associating security patterns and attack steps to design secure applications

International audienceDesign Patterns are now widely accepted and used in software engineering ; they represent generic and reusable solutions to common problems in software design. Security patterns are specialised patterns whose purpose is to help design applications that should meet security requirements. The enthusiasm surrounding security patterns has made emerge several catalogues listing up to 180 different patterns at the moment. This growing number brings an increased difficulty in choosing the most appropriate patterns for a given design problem. We propose a security pattern classification to facilitate the security pattern choice and a classification method based on data integration. The classification exposes relationships among software attacks, security principles and security patterns. It expresses the pattern combinations that are countermeasures to a given attack. This classification is semi-automatically inferred by means of a data-store integrating disparate publicly available security data. The data-store is also used to generate Attack Defense Trees. In our context, these illustrate, for a given attack, its sub-attacks, steps, techniques and the related defenses given under the form of security pattern combinations. Such trees make the pattern classification more readable even for beginners in security patterns. Finally, we evaluate on human subjects the benefits of using a pattern classification established for Web applications, which covers 215 attacks, 66 security principles and 26 security patterns

A methodology of security pattern classification and of Attack-Defense Tree generation

International audienceSecurity at the design stage of the software life cycle can be performed by means of security patterns, which are viable and reusable solutions to regular security problems. Their generic nature and growing number make their choice difficult though, even for experts in system design. To guide them through the appropriate choice of patterns, we present a methodology of security pattern classification and the classification itself, which exposes relationships among CAPEC attacks, CWE weaknesses and security patterns. Given a CAPEC attack, the classification expresses the security pattern combinations that overcome the attack. The methodology, which generates the classification is composed of five steps, which decompose patterns and attacks into sets of more precise sub-properties that are associated. These steps provide the justifications of the classification and can be followed again to upgrade it. From the classification, we also generate Attack-Defense Trees (ADTtrees), which depict an attack, its sub-attacks and the related defenses in the form of security pattern combinations. Without loss of generality, this classification has been established for Web applications and covers 215 attacks, 136 software weaknesses and 26 security patterns

An Advanced Approach for Choosing Security Patterns and Checking their Implementation

International audienceThis paper tackles the problems of generating concrete test cases for testing whether an application is vulnerable to attacks, and of checking whether security solutions are correctly implemented. The approach proposed in the paper aims at guiding developers towards the implementation of secure applications, from the threat modelling stage up to the testing one. This approach relies on a knowledge base integrating varied security data, e.g., attacks, attack steps, and security patterns that are generic and re-usable solutions to design secure applications. The first stage of the approach consists in assisting developers in the design of Attack Defense Trees expressing the attacker possibilities to compromise an application and the defenses that may be implemented. These defenses are given under the form of security pattern combinations. In the second stage, these trees are used to guide developers in the test case generation. After the test case execution, test verdicts show whether an application is vulnerable to the threats modelled by an ADTree. The last stage of the approach checks whether behavioural properties of security patterns hold in the application traces collected while the test case execution. These properties are formalised with LTL properties, which are generated from the knowledge base. Developers do not have to write LTL properties not to be expert in formal models. We experimented the approach on 10 Web applications to evaluate its testing effectiveness and its performance

Using Data Integration for Security Testing

Part 3: Safety and Security TestingInternational audienceThe explosion of digitisation makes a plethora of security data publicly available for developers. These numerous (often complex) documents expose them to the difficulty of choosing the most appropriate solution for securing their applications. We propose in this paper a method based upon data acquisition and integration, which assists developers in the Threat modelling stage and in the security test case execution. The method firstly helps devise Attack Defense Trees by means of a data-store. These trees show attacks, steps and defenses given under the form of security patterns, which are re-usable solutions to design more secure applications. These trees are then used for the test case generation. The data-store integrates test case stubs, which make this generation easier and developers more efficient. We evaluate our approach on 24 participants and show encouraging results on the use of data integration in software engineering