- Vulnerable module: shelljs
- Introduced through: firstname.lastname@example.org
- Introduced through: email@example.com › firstname.lastname@example.org
shelljs is a portable Unix shell commands for Node.js.
It is possible to invoke commands from
shell.exec() from external sources, allowing an attacker to inject arbitrary commands.
There is no fix version for
Regular Expression Denial of Service (DoS)
Vulnerability patched for: email@example.com.
- Vulnerable module: uglify-js
- Introduced through: firstname.lastname@example.org
- Introduced through: email@example.com › firstname.lastname@example.org › email@example.com
parse() function in the
uglify-js package prior to version 2.6.0 is vulnerable to regular expression denial of service (ReDoS) attacks when long inputs of certain patterns are processed.
"The Regular expression Denial of Service (ReDoS) is a Denial of Service attack, that exploits the fact that most Regular Expression implementations may reach extreme situations that cause them to work very slowly (exponentially related to input size). An attacker can then cause a program using a Regular Expression to enter these extreme situations and then hang for a very long time." 1
Upgrade to version 2.6.0 or greater.
If a direct dependency update is not possible, use
snyk wizard to patch this vulnerability.
Regular Expression Denial of Service (ReDoS)
- Vulnerable module: ms
- Introduced through: firstname.lastname@example.org
- Introduced through: email@example.com › firstname.lastname@example.org › email@example.com › firstname.lastname@example.org
ms is a tiny milisecond conversion utility.
Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) due to an incomplete fix for previously reported vulnerability npm:ms:20151024. The fix limited the length of accepted input string to 10,000 characters, and turned to be insufficient making it possible to block the event loop for 0.3 seconds (on a typical laptop) with a specially crafted string passed to
Proof of concept
ms = require('ms'); ms('1'.repeat(9998) + 'Q') // Takes about ~0.3s
Note: Snyk's patch for this vulnerability limits input length to 100 characters. This new limit was deemed to be a breaking change by the author. Based on user feedback, we believe the risk of breakage is very low, while the value to your security is much greater, and therefore opted to still capture this change in a patch for earlier versions as well. Whenever patching security issues, we always suggest to run tests on your code to validate that nothing has been broken.
For more information on
Regular Expression Denial of Service (ReDoS) attacks, go to our blog.
- Feb 9th, 2017 - Reported the issue to package owner.
- Feb 11th, 2017 - Issue acknowledged by package owner.
- April 12th, 2017 - Fix PR opened by Snyk Security Team.
- May 15th, 2017 - Vulnerability published.
- May 16th, 2017 - Issue fixed and version
- May 21th, 2017 - Patches released for versions
ms to version 2.0.0 or higher.