rust.lang.security.temp-dir.temp-dir

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LGPL Commons Clause
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temp_dir should not be used for security operations. From the docs: 'The temporary directory may be shared among users, or between processes with different privileges; thus, the creation of any files or directories in the temporary directory must use a secure method to create a uniquely named file. Creating a file or directory with a fixed or predictable name may result in “insecure temporary file” security vulnerabilities.'

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Defintion

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rules:
  - id: temp-dir
    message: "temp_dir should not be used for security operations. From the docs:
      'The temporary directory may be shared among users, or between processes
      with different privileges; thus, the creation of any files or directories
      in the temporary directory must use a secure method to create a uniquely
      named file. Creating a file or directory with a fixed or predictable name
      may result in “insecure temporary file” security vulnerabilities.'"
    pattern: std::env::temp_dir()
    metadata:
      references:
        - https://doc.rust-lang.org/stable/std/env/fn.temp_dir.html
      technology:
        - rust
      category: security
      cwe: "CWE-807: Reliance on Untrusted Inputs in a Security Decision"
      confidence: HIGH
      likelihood: LOW
      impact: LOW
      subcategory: audit
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    languages:
      - rust
    severity: INFO

Examples

temp-dir.rs

use std::env;

// ruleid: temp-dir
let dir = env::temp_dir()