oss-sec mailing list archives
Re: CVE request: uglify-js node.js module <2.4.24 incorrectly handles non-boolean comparisons during minification
From: Florian Weimer <fweimer () redhat com>
Date: Mon, 24 Aug 2015 21:50:00 +0200
On 08/24/2015 08:26 PM, Reed Loden wrote:
As seen on Hacker News -- https://zyan.scripts.mit.edu/blog/backdooring-js/ Blog post has all the details, but basically the UglifyJS node module has a problem where the combination of De Morgan’s Law and non-boolean values can lead to a case where code is incorrectly minified, which can lead to possibly malicious minified JS code. UglifyJS is a "JavaScript parser / mangler / compressor / beautifier toolkit" for Node.js.
How is this different from a any other compiler bug? They can be abused in similar ways by crafted code, and we don't treat them as vulnerabilities (unless there is actual application impact beyond synthetic test cases). Note that I'm not saying this isn't a nice find, I'm just not sure if it should be considered as a security by itself. -- Florian Weimer / Red Hat Product Security
Current thread:
- CVE request: uglify-js node.js module <2.4.24 incorrectly handles non-boolean comparisons during minification Reed Loden (Aug 24)
- Re: CVE request: uglify-js node.js module <2.4.24 incorrectly handles non-boolean comparisons during minification Reed Loden (Aug 24)
- Re: CVE request: uglify-js node.js module <2.4.24 incorrectly handles non-boolean comparisons during minification Florian Weimer (Aug 24)