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CVE-2019-5477

9.8 · CRITICAL

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.

Published Aug 16, 2019CWE-78EPSS 5.90%

Overview

CVE-2019-5477 is a critical-severity vulnerability. It was published on August 16, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sparklemotion/nokogiri/issues/1915GitHubgithub.com/tenderlove/rexical/blob/master/CHANGELOG.rdocRefhackerone.com/reports/650835Reflists.debian.org/debian-lts-announce/2019/09/msg00027.htmlReflists.debian.org/debian-lts-announce/2022/10/msg00018.htmlReflists.debian.org/debian-lts-announce/2022/10/msg00019.htmlRefsecurity.gentoo.org/glsa/202006-05Refusn.ubuntu.com/4175-1/GitHubgithub.com/sparklemotion/nokogiri/issues/1915GitHubgithub.com/tenderlove/rexical/blob/master/CHANGELOG.rdoc

How CyberStrike helps

Frequently asked questions

What is CVE-2019-5477?

CVE-2019-5477 is a critical-severity vulnerability. It was published on August 16, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2019-5477?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-5477?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-5477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-5477 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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