Code execution Security Vulnerability

Description

Code injection vulnerabilities occur where the output or content served from a web application can be manipulated in such a way that it triggers server-side code execution. In some poorly written web applications that allow users to modify server-side files (such as by posting to a message board or guestbook), it is sometimes possible to inject code in the scripting language of the web application itself.

Impact
A malicious user may execute arbitrary system commands with the permissions of the web server.

References
Security Focus - Penetration Testing for Web Applications (Part Two)
OWASP PHP Top 5

Acunetix Web Application Security Blog

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