Shellshock Vulnerability Affects GNU/Bash Shell Systems
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🐚💻 Shellshock vulnerability exposes critical flaw in Bash. Discovered in 2014, Shellshock is a severe vulnerability affecting the GNU/Bash shell, enabling remote code execution on vulnerable Apache web servers, particularly those using CGI scripts. The flaw arises from a malformed Bash function definition that allows attackers to inject malicious commands via environment variables. Primarily impacting Linux and Unix-based systems running Bash versions ≤ 4.2, Shellshock does not affect Windows systems. The article details how CGI scripts process user requests and how the vulnerability can be exploited, including a demonstration of a vulnerable lab setup. Security measures and detection methods, such as using nmap scripts, are also discussed to help identify affected systems.
