Vulnerability CVE-2019-10773
Published: 2019-12-16

Description:
In Yarn before 1.21.1, the package install functionality can be abused to generate arbitrary symlinks on the host filesystem by using specially crafted "bin" keys. Existing files could be overwritten depending on the current user permission set.

Type:

CWE-59

 (Improper Link Resolution Before File Access ('Link Following'))

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Yarnpkg -> YARN 

 References:
https://blog.daniel-ruf.de/critical-design-flaw-npm-pnpm-yarn/
https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7
https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023
https://snyk.io/vuln/SNYK-JS-YARN-537806
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