Vulnerability in Yarnpkg Website
CVE-2018-12556
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/yarnpkg/website/commits/master (Third Party Advisory)
- seclists.org/fulldisclosure/2019/Apr/38 (mailing-list, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html (VDB Entry, Third Party Advisory)
- www.openwall.com/lists/oss-security/2019/04/30/4 (mailing-list, Mailing List, Third Party Advisory)
- github.com/RUB-NDS/Johnny-You-Are-Fired (Third Party Advisory)
- github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf (Third Party Advisory)
Frequently asked questions
- What is CVE-2018-12556?
- CVE-2018-12556 is a medium-severity vulnerability in Yarnpkg Website, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2019-05-16.
- How severe is CVE-2018-12556?
- Medium severity. CVSS v3 base score is 5.9 out of 10.