uglifier incorrectly handles non-boolean comparisons during minification

Metadata

unknown
unknown
uglifier
github.com
2015-07-21
2017-04-01 19:10
2017-01-05 20:15

Description


The upstream library for the Ruby uglifier gem, UglifyJS, is
affected by a vulnerability that allows a specially crafted
Javascript file to have altered functionality after minification.

This bug, found in UglifyJS versions 2.4.23 and earlier, was demonstrated
to allow potentially malicious code to be hidden within secure code,
and activated by the minification process.

For more information, consult: https://zyan.scripts.mit.edu/blog/backdooring-js/

Am I vulnerable?

The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

Or, you can just let us figure it out for you! Appcanary continously monitor your installed packages, and tell you if any of them are vulnerable.

Sign up for monitoring

Affected package information

Package Patched in Unaffected in
uglifier >= 2.7.2 None