CVE-2019-5477

Description

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. Processes are vulnerable only if the undocumented method `Nokogiri::CSS::Tokenizer#load_file` is being called with unsafe user input as the filename. This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

How to fix CVE-2019-5477

To remediate CVE-2019-5477, upgrade the affected package to a fixed version below.

—upgrade to 1.0.7-1 or later
—upgrade to 1.0.5-2+deb10u1 or later
—upgrade to 1.10.0+dfsg1-2+deb10u1 or later
—upgrade to 1.6.3.1+ds-1+deb8u1 or later
—upgrade to 1.10.4+dfsg1-1 or later
—upgrade to 1.10.4 or later
—upgrade to 1.0.7 or later

Is CVE-2019-5477 being exploited?

Moderate — EPSS is 9.3%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (7)

from 0, < 1.0.7-1
from 0, < 1.0.5-2+deb10u1
from 0, < 1.10.0+dfsg1-2+deb10u1
from 0, < 1.6.3.1+ds-1+deb8u1
from 0, < 1.10.4+dfsg1-1
from 0, < 1.10.4
from 0, < 1.0.7

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	CRITICAL9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H