Command Injection via Bash Completion in Environment Modules

Executive Summary

This is a command injection vulnerability in the environment-modules package's Bash completion feature. An attacker can place a maliciously named module file in a directory visible to the victim's MODULEPATH. When the victim uses Bash completion for module or ml commands, the malicious module name containing shell metacharacters is executed as a command, leading to arbitrary command execution in the victim's shell.

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Detection Guidance

Check if the environment-modules package is installed and review module files in MODULEPATH for suspicious names containing shell metacharacters like $(...). Inspect Bash completion scripts for module or ml commands in shell configuration directories (e.g., /etc/bash_completion.d/). Look for files named module or ml in common completion paths.

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Impact Analysis

This vulnerability can lead to arbitrary command execution in your shell session when using Bash completion for module or ml commands. This may compromise your system's confidentiality, integrity, and availability. An attacker could gain control over your system, access sensitive data, modify files, or disrupt services.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy). Organizations affected by this flaw may face legal penalties, reputational damage, and loss of trust due to compromised data confidentiality and integrity.

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Mitigation Strategies

Disable Bash completion for module and ml commands by removing or renaming the completion scripts in /etc/bash_completion.d/. Avoid including untrusted directories in MODULEPATH. Update the environment-modules package to a patched version (4.5.4, 5.3.2, or 5.6.2).

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