Description

The package integrity validation in yarn < 1.19.0 contains a TOCTOU vulnerability where the hash is computed before writing a package to cache. It's not computed again when reading from the cache. This may lead to a cache pollution attack.

Remediation

References

https://hackerone.com/reports/703138

https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c

https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190

Related Vulnerabilities

CVE-2021-23797 Vulnerability in npm package http-server-node

CVE-2020-36379 Vulnerability in npm package aaptjs

CVE-2022-2218 Vulnerability in npm package parse-url

CVE-2021-23343 Vulnerability in npm package path-parse

CVE-2021-41167 Vulnerability in npm package modern-async

Severity

Medium

Classification

CWE-367 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Tags

Exploit Mitigation Third Party Advisory