Shellshock

Description

Check for Shellshock vulnerabilities.

Remediation

Shellshock vulnerability takes advantage of a bug in BASH, in which, BASH incorrectly executes trailing commands when it imports a function definition stored into an environment variable. Any environment which allows defining BASH environmental variables could be vulnerable to this bug, as for example a Apache Web Server using mod_cgi and mod_cgid modules. A known-good request was modified to include malicious content. The malicious content includes an Shell shock attack in which the server-side application returns a specific text (evidence) in the response headers.

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