==========================================================================
Ubuntu Security Notice USN-6424-1
October 10, 2023
ruby-kramdown vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Summary:
kramdown could be made to execute arbitrary code if it received specially
crafted input.
Software Description:
- ruby-kramdown: Fast, pure-Ruby Markdown-superset converter - ruby library
Details:
It was discovered that kramdown did not restrict Rouge formatters to the
correct namespace. An attacker could use this issue to cause kramdown to
execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
   ruby-kramdown                   1.17.0-4ubuntu0.2
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6424-1
   CVE-2021-28834
Package Information:
   https://launchpad.net/ubuntu/+source/ruby-kramdown/1.17.0-4ubuntu0.2