CVE-2020-14001 Unintended read access in kramdown gem

What is CVE-2020-14001?

CVE-2020-14001 is a critical code injection vulnerability in Canonical Ubuntu Linux, published on 17 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2020-14001?

2 open source packages ship an affected version, including kramdown. It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Kramdown Project Kramdown.

How do I fix CVE-2020-14001?

Upgrade kramdown to 2.3.0 or later.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2020-14001 being exploited?

There is no known exploitation of CVE-2020-14001 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-14001, DLA-2316-1, DSA-4743-1, GHSA-mqm2-cgpr-p4m6, OESA-2021-1280, SUSE-SU-2022:3259-1 and 2 more.