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CVE-2018-12556

5.9 · MEDIUM

The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only verifies that the yarn release is signed by any (arbitrary) key in the local keyring of the user, and doe…

Published May 16, 2019CWE-347EPSS 1.77%

Overview

CVE-2018-12556 is a medium-severity vulnerability. It was published on May 16, 2019 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The signature verification routine in install.sh in yarnpkg/website through 2018-06-05 only verifies that the yarn release is signed by any (arbitrary) key in the local keyring of the user, and does not pin the signature to the yarn release key, which allows remote attackers to sign tampered yarn release packages with their own key.

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

Refpacketstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlRefseclists.org/fulldisclosure/2019/Apr/38GitHubgithub.com/RUB-NDS/Johnny-You-Are-FiredGitHubgithub.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdfGitHubgithub.com/yarnpkg/website/commits/masterRefwww.openwall.com/lists/oss-security/2019/04/30/4Refpacketstormsecurity.com/files/152703/Johnny-You-Are-Fired.htmlRefseclists.org/fulldisclosure/2019/Apr/38GitHubgithub.com/RUB-NDS/Johnny-You-Are-FiredGitHubgithub.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2018-12556?

CVE-2018-12556 is a medium-severity vulnerability. It was published on May 16, 2019 and has a CVSS 3.0 base score of 5.9 (MEDIUM).

How severe is CVE-2018-12556?

This vulnerability has a CVSS 3.0 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-12556?

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-2018-12556?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-12556 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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