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Create app.js #3

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Create app.js
scw-examples Sep 30, 2021
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Merge branch 'main' into feature-1
scw-examples Sep 30, 2021
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4 changes: 4 additions & 0 deletions app.js
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Expand Up @@ -3,5 +3,9 @@ const app = express()
const port = 3000

app.get('/', (req, res) => res.send('Hello World!'))
app.get('/foo/:id', (req, res) => {
eval('console.log("something", ' + req.params.id + ')');
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@scw-examples scw-examples Sep 30, 2021

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This looks like it might be vulnerable to code injection

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@secure-code-warrior-for-github secure-code-warrior-for-github bot Sep 30, 2021

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Micro-Learning Topic: Code injection (Detected by phrase)

Matched on "code injection"

What is this? (2min video)

Code injection happens when an application insecurely accepts input that is subsequently used in a dynamic code evaluation call. If insufficient validation or sanitisation is performed on the input, specially crafted inputs may be able to alter the syntax of the evaluated code and thus alter execution. In a worst case scenario, an attacker could run arbitrary code in the server context and thus perform almost any action on the application server.

Try this challenge in Secure Code Warrior

res.send(`Hello ${req.params.id}`)
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@scw-examples scw-examples Sep 30, 2021

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Could this be a cross-site scripting issue?

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Micro-Learning Topic: Cross-site scripting (Detected by phrase)

Matched on "cross-site scripting"

What is this? (2min video)

Reflected cross-site scripting vulnerabilities occur when unescaped input is displayed in the resulting page displayed to the user. When HTML or script is included in the input, it will be processed by a user's browser as HTML or script and can alter the appearance of the page or execute malicious scripts in their user context.

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})

app.listen(port, () => console.log(`Example app listening on port ${port}!`))