USN-4571-1: rack-cors vulnerability

Publication date

5 October 2020

Overview

rack-cors would allow unintended access to files over the network.

Releases

16.04 LTS

Packages

ruby-rack-cors - provides support for Cross-Origin Resource Sharing (CORS) for Rack compatible web applications

It was discovered that rack-cors did not properly handle relative file
paths. An attacker could use this vulnerability to access arbitrary files.

In general, a standard system update will make all the necessary changes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release	Package Version
16.04 xenial	ruby-rack-cors – 0.4.0-1+deb9u2build0.16.04.1

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