Vulnerability CVE-2018-12556
Published: 2019-05-16

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.

Type:

CWE-347

 (Improper Verification of Cryptographic Signature)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Yarnpkg -> Website 

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