Published: 16/05/2019 Updated: 21/05/2019

CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 5.9 | Impact Score: 3.6 | Exploitability Score: 2.2

VMScore: 383

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

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 malicious users to sign tampered yarn release packages with their own key.

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yarnpkg website

oss-sec mailing list archives   By Date By Thread </form>    Spoofing OpenPGP and S/MIME Signatures in Emails (multiple clients)   Fro ...

CWE-347 https://www.openwall.com/lists/oss-security/2019/04/30/4 https://github.com/yarnpkg/website/commits/master https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf https://github.com/RUB-NDS/Johnny-You-Are-Fired http://seclists.org/fulldisclosure/2019/Apr/38 http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html https://nvd.nist.gov http://seclists.org/oss-sec/2019/q2/80

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CVE-2018-12556

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