C Languace Issues
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203 Chapter 6 C Language Issues “One day you will understand.” Neel Mehta, Senior Researcher, Internet Security Systems X-Force Introduction When you’re reviewing software to uncover potential security holes, it’s important to understand the underlying details of how the programming language implements data types and operations, and how those details can affect execution flow. A code reviewer examining an application binary at the assembly level can see explicitly how data is stored and manipulated as well as the exact implications of an operation on a piece of data. However, when you’re reviewing an application at t he source code level, some details are abstracted and less obvious. This abstraction can lead to the introduction of subtle vulnerabilities in software that remain unnoticed and uncorrected for long periods of time. A thorough auditor should be familiar with the source language’s underlying implementation and how these details can lead to security-relevant condi- tions in border cases or exceptional situations. Dowd-Chapter_Rev -06.qxp 10/14/06 1:17 AM Page 203
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