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Shell Command Interpreter Security

c3de86aa-626c-40d9-ab51-b94c30dcbe6a

Shell Command Interpreter Security

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Updated5/2/2026

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PERTAIN_TOReport

CVE-2014-6271 Shellshock: bash parses past function boundary in env var imports

PERTAIN_TOProblem

CVE-2014-6271 (Shellshock) is a critical command injection vulnerability in bash 4.3 and earlier. — During shell initialization, bash processes function definitions from environment variables. Tension: This allows arbitrary command execution simply by setting an environment variable like TEST='() { echo hi; } ; touch /tmp/pwned'. Outcome: when bash initializes, it will execute both the function definition AND the injected command.

PERTAIN_TOSolution

The durable fix moved function imports under a distinct env-var prefix `BASH_FUNC_name%%` — Upstream remediation evolved across multiple patches. Tension: ad-hoc string checks proved insufficient. Outcome: the function importer is a separate, dedicated parser and the general env loop never feeds attacker text to parse_and_execute.

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