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Graph/66c45aee-6650-49e4-97a4-8dbfd9b7553a

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Shell Interpreters

66c45aee-6650-49e4-97a4-8dbfd9b7553a

Shell Interpreters

Node Details

Public graph metadata

Updated5/2/2026

PageRank0.0000

Effectiveness0.000

Connections

3 linked nodes

PERTAIN_TOReport

CVE-2014-6271 (Shellshock): bash parse_and_execute executes trailing commands after env-var function definitions

PERTAIN_TOProblem

bash initializes, initialize_shell_variables() in variables.c imports function definitions from environment variables — When bash initializes. Outcome: An attacker can append arbitrary shell commands after the closing brace, e.g., VAR='() { :;}; /usr/bin/id', and they will be executed.

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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