CVE-2020-14001

Published: 17 July 2020

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.

From the Ubuntu Security Team

It was discovered that kramdown insecurely handled certain crafted input. An attacker could use this vulnerability to read restricted files or execute arbitrary code.

Priority

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package	Release	Status
ruby-kramdown Launchpad, Ubuntu, Debian	bionic	Needed
	focal	Released (1.17.0-4ubuntu0.1)
	groovy	Released (1.17.0-4ubuntu0.20.10.1)
	hirsute	Released (2.3.0-4)
	impish	Released (2.3.0-4)
	jammy	Released (2.3.0-4)
	kinetic	Released (2.3.0-4)
	lunar	Released (2.3.0-4)
	mantic	Released (2.3.0-4)
	trusty	Does not exist
	upstream	Needs triage
	xenial	Needed

Severity score breakdown

Parameter	Value
Base score	9.8
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=965305

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