Applications using Asciidoctor (Ruby) with asciidoctor-include-ext (prior to version 0.4.0), which render user-supplied input in AsciiDoc markup, may allow an attacker to execute arbitrary system commands on the host operating system.
This attack is possible even when (EDIT: it’s not)
allow-uri-read is disabled!
The vulnerability has been fixed in commit c7ea001 (and further improved in cbaccf3), which is included in version 0.4.0.
require 'asciidoctor/include_ext' class Asciidoctor::IncludeExt::IncludeProcessor # Overrides superclass private method to mitigate Command Injection # vulnerability in asciidoctor-include-ext <0.4.0. def target_uri?(target) target.downcase.start_with?('http://', 'https://') \ && URI.parse(target).is_a?(URI::HTTP) rescue URI::InvalidURIError false end end
This vulnerability was discovered by Joern Schneeweisz from the GitLab Security Research Team.
For more information
See commit message c7ea001.
If you have any questions or comments about this advisory open an issue in jirutka/asciidoctor-include-ext.