VDB
CVE-2018-12556
CVE-2018-12556
PUBLISHED
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.
EPSS 0.33% · 56.0th percentile
Risk Scores
EPSS Score
0.33%
56.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:20.04:LTS | node-yarnpkg | 1.22.4-2, 1.19.1-1, 1.13.0-3 |
| Ubuntu:22.04:LTS | node-yarnpkg | 1.22.10+~cs22.25.14-3, 1.22.10+~cs22.25.14-5, 1.22.10+~cs22.25.14-8 |
| Ubuntu:25.10 | node-yarnpkg | 0, 4.0.2+dfsg-3, 4.1.0+dfsg-1 |
| Ubuntu:24.04:LTS | node-yarnpkg | *, 1.22.19+~cs24.27.18-4, 0 |
Exploit Intelligence
- https://github.com/yarnpkg/website/commits/master (circl)
- http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html (circl)
- [oss-security] 20190430 Spoofing OpenPGP and S/MIME Signatures in Emails (multiple clients) (circl)
- https://github.com/RUB-NDS/Johnny-You-Are-Fired (circl)
- https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf (circl)
- 20190430 OpenPGP and S/MIME signature forgery attacks in multiple email clients (cve.org)
Timeline
- May 16, 2019 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Dec 27, 2021 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- May 2, 2022 EPSS Score
- Sep 5, 2022 EPSS Score
- Nov 6, 2022 EPSS Score
- Jan 8, 2023 EPSS Score
References
- https://ubuntu.com/security/CVE-2018-12556 third-party-advisory
- http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html third-party-advisory
- http://seclists.org/fulldisclosure/2019/Apr/38 third-party-advisory
- https://github.com/RUB-NDS/Johnny-You-Are-Fired third-party-advisory
- https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf third-party-advisory
- https://github.com/yarnpkg/website/commits/master third-party-advisory
- https://www.openwall.com/lists/oss-security/2019/04/30/4 third-party-advisory
- https://neopg.io/blog/yarn-signature-bypass/ third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2018-12556 third-party-advisory