id: express-lfr

info:
  name: Express - Local File Read
  author: me_dheeraj (https://twitter.com/Dheerajmadhukar)
  severity: info
  description: Untrusted user input in express render() function can result in arbitrary file read if hbs templating is used.
  tags: file,nodejs,express,lfr

file:
  - extensions:
      - all

    matchers:
      - type: regex
        regex:
          - "(\\$[\\w\\W]+?)\\.render\\(\\$[\\w\\W]+?, <[\\w\\W]+? \\\\$[\\w\\W]+? [\\w\\W]+? >\\)"
          - "(\\$[\\w\\W]+?)\\.render\\(\\$[\\w\\W]+?, <[\\w\\W]+? \\\\$[\\w\\W]+?\\.\\$[\\w\\W]+? [\\w\\W]+? >\\)"
          - "(\\$[\\w\\W]+?)\\.render\\(\\$[\\w\\W]+?, <[\\w\\W]+? \\\\$[\\w\\W]+? [\\w\\W]+? >\\)"
        condition: or