• Journal of Digital Convergence
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• v.13 no.2
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• pp.177-183
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• 2015

Cross Site Scripting enables hackers to steal other user's information (such as cookie, session etc.) or to do abnormal functions automatically using vulnerability of web application. This attack patterns of Cross Site Scripting(XSS) can be divided into two types. One is Reflect XSS which can be executed in one request for HTTP and its reply, and the other is Stored XSS which attacks those many victim users whoever access to the page which accepted the payload transmitted. To correspond to these XSS attacks, some measures have been suggested. They are data validation for user input, output validation during HTML encoding procedures, and removal of possible risk injection point to prevent from trying to insert malicious code into web application. In this paper, the methods and procedures for these two types are explained and a penetration testing is done. With these suggestions, the attack by XSS could be understood and prepared by its countermeasures.

• The KIPS Transactions:PartA
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• v.15A no.3
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• pp.181-188
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• 2008

Nowadays, most web sites are developed using dynamic web pages where web pages are generated and transmitted by web application programs. Therefore, the ratio of attacks injecting malevolent strings to vulnerable web applications is increasing. In this paper, we present a static program analyzer which analyzes whether a web application program has vulnerabilities to the SQL injection attack and the cross site scripting(XSS) attack. To analyze programs using abstract interpretation framework, we designed an abstract domain which models potential string set along with excluded strings and developed an abstract interpreter for the PHP language. Also, based on them, we implemented a static analyzer. According to our experiments, our analyzer has competitive analysis speed and accuracy compared with related research results.

• 한국IT서비스학회:학술대회논문집
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• 2007.11a
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• pp.549-553
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• 2007

웹의 사용의 확대와 함께 웹 어플리케이션에 대한 공격도 증가하고 있으며 그 형태도 다양화하고 지능화하고 있다. 웹 어플리케이션 방화벽은 이러한 공격으로부터 웹 어플리케이션을 보호하기 위한 시스템이다. 본 논문에서는 현재의 웹 어플리케이션 위협 요소 중 취약한 크로스 사이트 스크립팅과 세션 보호의 문제점을 분석하고 해결 방안을 제시한다. 그리고 일반적인 웹 어플리케이션 방화벽이 앞으로 발전되어야 할 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.644-647
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• 2013

인터넷과 정보기술의 발전으로 정보시스템들이 보편화 되고, 편리함을 제공하고 있다. 반면에 시스템은 더욱 복잡해지고, 프라이버시 침해, 개인정보 수집 등 사이버공격은 계속적으로 증가하고 있으며 이로 인한 피해가 심각하다. 사이버 공격을 예방하기 위해서는 정보시스템 제품출시 이전 단계에서 제품의 보안 취약점을 제거하는 것이 중요하다. 따라서 개발단계부터 보안을 고려한 소프트웨어를 개발하는 것은 향후 발생 가능한 보안취약점을 예방하고 피해를 최소화 하여 보다 안전한 소프트웨어를 개발하는 근본적인 해결책이 된다. 본 논문에서는 소프트웨어 개발과정에서 발생할 수 있는 보안약점을 최소화 하여 안전한 소프트웨어를 개발하기 위한 시큐어 코딩(secure coding)과 입력 데이터 값(문자열)을 정규화 함으로써 크로스 사이트 스크립팅(XSS)의 공격을 사전에 예방할 수 있는 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.784-786
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• 2015

사물인터넷 시대가 도래함에 따라, 사물과 인터넷 간의 연결을 위한 무선 공유기의 활용이 증가하고 있다. 그러나 무선 공유기의 보안 취약점을 악용한 침해 사고도 지속적으로 발생하고 있어, 공유기 보안이 심각한 문제로 대두된 상황이다. 본 논문에서는 국내에서 사용되는 3사의 공유기가 제공하는 웹 기반 관리자 인터페이스에서 발견된 크로스 사이트 스크립팅(cross-site scripting) 취약점을 분석한다. 발견된 취약점을 기반으로, 가능한 공격 시나리오와 패치 발표 이전까지 임시 대응할 수 있는 방법을 제시한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.4
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• pp.669-677
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• 2020

As the number of Internet users exploded, attacks on the web increased. In addition, the attack patterns have been diversified to bypass existing defense techniques. Traditional web firewalls are difficult to detect attacks of unknown patterns.Therefore, the method of detecting abnormal behavior by artificial intelligence has been studied as an alternative. Specifically, attempts have been made to apply natural language processing techniques because the type of script or query being exploited consists of text. However, because there are many unknown words in scripts and queries, natural language processing requires a different approach. In this paper, we propose a new classification model which uses byte pair encoding (BPE) technology to learn the embedding vector, that is often used for web attack payloads, and uses an attention mechanism-based Bi-GRU neural network to extract a set of tokens that learn their order and importance. For major web attacks such as SQL injection, cross-site scripting, and command injection attacks, the accuracy of the proposed classification method is about 0.9990 and its accuracy outperforms the model suggested in the previous study.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.2
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• pp.283-293
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• 2012

A new type of malware that extracts personal and account data over an extended period of time and that apparently is resistant to detection by vaccines has been identified. Generally, a malware is installed on a computer through network-to-network connections by utilizing Web vulnerabilities that contain injection, XSS, broken authentication and session management, or insecure direct-object references, among others. After the malware executes registration of an arbitrary service and an arbitrary process on a computer, it then periodically communicates the collected confidential information to a hacker. This paper is a systematic approach to analyzing a new type of malware called "winweng," a kind of worm that frequently made appearances during the first half of 2011. The research describes how the malware came to be in circulation, how it infects computers, how its operations expose its existence and suggests improvements in responses and countermeasures. Keywords: Malware, Worm, Winweng, SNORT.

• Convergence Security Journal
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• v.12 no.3
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• pp.99-106
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• 2012

Today, the typical web hacking attacks are cross-site scripting(XSS) attacks, injection vulnerabilities, malicious file execution and insecure direct object reference included. Web hacking security systems, access control solutions, access only to the web service and flow inside but do not control the packet. So you have been illegally modified to pass the packet even if the packet is considered as a unnormal packet. The defense system is to fail to appropriate controls. Therefore, in order to ensure a successful web services diagnostic system development is necessary. Web application diagnostic system is real and urgent need and alternative. The diagnostic system development process mu st be carried out step of established diagnostic systems, diagnostic scoping web system vulnerabilities, web application, analysis, security vulnerability assessment and selecting items. And diagnostic system as required by the web system environment using tools, programming languages, interfaces, parameters must be set.