Vulnerability Details : 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.
Products affected by CVE-2018-12556
- cpe:2.3:a:yarnpkg:website:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-12556
0.34%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-12556
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2018-12556
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-12556
-
http://packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html
Johnny You Are Fired ≈ Packet StormVDB Entry;Third Party Advisory
-
http://seclists.org/fulldisclosure/2019/Apr/38
Full Disclosure: OpenPGP and S/MIME signature forgery attacks in multiple email clientsMailing List;Third Party Advisory
-
https://github.com/yarnpkg/website/commits/master
Commits · yarnpkg/website · GitHubThird Party Advisory
-
https://github.com/RUB-NDS/Johnny-You-Are-Fired
GitHub - RUB-NDS/Johnny-You-Are-Fired: Artifacts for the USENIX publication.Third Party Advisory
-
https://www.openwall.com/lists/oss-security/2019/04/30/4
oss-security - Spoofing OpenPGP and S/MIME Signatures in Emails (multiple clients)Mailing List;Third Party Advisory
-
https://github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf
Johnny-You-Are-Fired/johnny-fired.pdf at master · RUB-NDS/Johnny-You-Are-Fired · GitHubThird Party Advisory
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