GHSA-hjxc-462x-x77j

TOCTOU Race Condition in Yarn

Source: GitHub Advisory Database (reviewed) Moderate CVE-2019-15608

Packages

Ecosystem	Package	Affected	Fixed in
npm	yarn	< 1.19.0	1.19.0

Details

As written in the advisory (Markdown source, shown as plain text).

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. This issue is fixed in 1.19.0.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2019-15608 advisory
https://github.com/yarnpkg/yarn/commit/0474b8c66a8ea298f5e4dedc67b2de464297ad1c web
https://hackerone.com/reports/703138 web
https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md#1190 web