Innocent code: a security wake-up call for Web programmers - download pdf or read online

By Sverre H. Huseby

ISBN-10: 0470857447

ISBN-13: 9780470857441

  • This concise and sensible e-book exhibits the place code vulnerabilities lie-without delving into the specifics of every method structure, programming or scripting language, or application-and how top to mend them
  • Based on real-world events taken from the author's reports of monitoring coding blunders at significant monetary institutions
  • Covers SQL injection assaults, cross-site scripting, facts manipulation in an effort to skip authorization, and different assaults that paintings due to lacking items of code
  • Shows builders the way to swap their mind-set from site development to website destruction to be able to locate risky code

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Example text

Encrypted communication starts. The handshake may also include a client certificate to let the server authenticate the client, but that step is optional. After the handshake is done, control is passed to the original handler, who now talks plain HTTP over the encrypted channel. If everything works as expected, HTTPS makes it impossible for someone to listen to traffic in order to extract secrets. People may still sniff packets, but the packets contain seemingly random data. HTTPS thus protects against packet sniffing (Appendix B).

For systems that automatically escape or remove quote characters, such as PHP, the above query would fail because of the quotation marks in WHERE UserName=’john’. It’s possible to get around that limitation too, as many databases allow us to make string constants without using quotes. In MS SQL Server one may inject SQL strings by using the char function [53]. In that system, the following expression is equivalent to the string constant ’SQL’: char(83)+char(81)+char(76) The numbers 83, 81 and 76 are the decimal values for the ASCII codes of the characters S, Q and L respectively.

For systems that automatically escape or remove quote characters, such as PHP, the above query would fail because of the quotation marks in WHERE UserName=’john’. It’s possible to get around that limitation too, as many databases allow us to make string constants without using quotes. In MS SQL Server one may inject SQL strings by using the char function [53]. In that system, the following expression is equivalent to the string constant ’SQL’: char(83)+char(81)+char(76) The numbers 83, 81 and 76 are the decimal values for the ASCII codes of the characters S, Q and L respectively.

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Innocent code: a security wake-up call for Web programmers by Sverre H. Huseby


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