Avoid using unsanitized user input with sendFile

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Metadata

ID: javascript-express/external-filename-upload

Language: JavaScript

Severity: Warning

Category: Security

Description

Using unsanitized user input in a sendFile method can allow attackers to access unintended resources.

Set the root option directly in your sendFile options will make this rule not report a violation.

Learn More

Express sendFile API reference

Non-Compliant Code Examples

app.post("/upload", (req, res) => {
    res.sendFile(req.params.filename)

    // options passed, but no root set
    res.sendFile(req.params.filename, { maxAge: 0 })

    // options passed, but no root set, and a callback is set
    res.sendFile(req.params.filename, { maxAge: 0 }, (err) => console.log(err))
})

Compliant Code Examples

app.post("/upload", (req, res) => {
    res.sendFile("foo")

    const options = { maxAge: 0, root: path.join(__dirname, "upload") }

    // options with root set
    res.sendFile(req.params.filename, options)
    res.sendFile(req.params.filename, { maxAge: 0, root: path.join(__dirname, "upload") })

    // options with root set (and a callback is set)
    res.sendFile(req.params.filename, options, (err) => console.log(err))
    res.sendFile(req.params.filename, { maxAge: 0, root: path.join(__dirname, "upload") }, (err) => console.log(err))
})