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MitreCVE-2018-12556

HistoryMay 16, 2019 - 5:29 p.m.

CVE-2018-12556

2019-05-1617:29:00

CWE-347

mitre

web.nvd.nist.gov

cve

2018

12556

signature verification

yarnpkg

website

remote attackers

tampered yarn release

security vulnerability

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

AI Score

6.6

Confidence

High

EPSS

0.004

Percentile

74.7%

JSON

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.

Affected configurations

Nvd

Node

yarnpkgwebsiteRange≤2018-06-05

VendorProductVersionCPE
yarnpkgwebsite*cpe:2.3:a:yarnpkg:website:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
yarnpkg	website	*	cpe:2.3:a:yarnpkg:website::::::::

References

packetstormsecurity.com/files/152703/Johnny-You-Are-Fired.html

seclists.org/fulldisclosure/2019/Apr/38

github.com/RUB-NDS/Johnny-You-Are-Fired

github.com/RUB-NDS/Johnny-You-Are-Fired/blob/master/paper/johnny-fired.pdf

github.com/yarnpkg/website/commits/master

www.openwall.com/lists/oss-security/2019/04/30/4

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

AI Score

6.6

Confidence

High

EPSS

0.004

Percentile

74.7%

JSON

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