mcp-server-semgrep/semgrep-rules/scala/lang/security/audit/path-traversal-fromfile.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: path-traversal-fromfile
  metadata:
    cwe:
    - "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
    owasp:
    - A05:2017 - Broken Access Control
    - A01:2021 - Broken Access Control
    category: security
    technology:
    - scala
    resources:
    - https://find-sec-bugs.github.io/bugs.htm
    confidence: LOW
    references:
    - https://owasp.org/Top10/A01_2021-Broken_Access_Control
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: MEDIUM
  message: >-
    Flags cases of possible path traversal. If an unfiltered parameter is passed into 'fromFile', file
    from an arbitrary filesystem
    location could be read. This could lead to sensitive data exposure and other provles. Instead, sanitize
    the user input
    instead of performing direct string concatenation.
  severity: WARNING
  languages:
  - scala
  patterns:
  - pattern-either:
    - patterns:
      - pattern-either:
        - pattern-inside: |
            $FILENAME = "..." + $VAR
            ...
        - pattern-inside: |
            $FILENAME = $VAR + "..."
            ...
        - pattern-inside: |
            $FILENAME = $STR.concat($VAR)
            ...
        - pattern-inside: |
            $FILENAME = "...".format(..., $VAR, ...)
            ...
      - pattern: Source.fromFile($FILENAME, ...)
    - patterns:
      - pattern-either:
        - pattern: Source.fromFile("..." + $VAR, ...)
        - pattern: Source.fromFile($VAR + "...", ...)
        - pattern: Source.fromFile($STR.concat($VAR), ...)
        - pattern: Source.fromFile("...".format(..., $VAR, ...), ...)
  - pattern-inside: |
      def $FUNC(..., $VAR: $TYPE, ...) = Action {
        ...
      }