RubySec

Providing security resources for the Ruby community

CVE-2020-14001 (kramdown): Unintended read access in kramdown gem

ADVISORIES

GEM

kramdown

SEVERITY

CVSS v3: 9.8 (Critical)

CVSS v2: 7.5 (High)

PATCHED VERSIONS

  • >= 2.3.0

DESCRIPTION

The kramdown gem before 2.3.0 for Ruby processes the template option inside Kramdown documents by default, which allows unintended read access (such as template=”/etc/passwd”) or unintended embedded Ruby code execution (such as a string that begins with template=”string://<%= `). NOTE: kramdown is used in Jekyll, GitLab Pages, GitHub Pages, and Thredded Forum.