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Secure Scripting

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  • 1. A BRIEF INTRODUCTION TO SECURE SCRIPTING Contents 1. Introduction 2. Input taint checking 3. String manipulation 4. File manipulation 5. Use of system calls 6. Variable declaration 1. Introduction These days there are a lot of people that release scripts and programs on to the Internet which people will then download and use without a second thought that they may contain the simplest of security holes which can allow malicious people to attack their servers. In this paper i intend to address some of the common mistakes that are made by the programmers releasing these programs, and how it should be written properly. The paper will mainly focus on Common Gateway Interface (CGI) scripts with examples written in perl (in my opinion the most common language used to write CGI scripts). The paper is, however, relevant to all languages, not just perl. The main way in which CGI scripts are exploited is by a user presenting it with values that

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