Time-of-check Time-of-use (TOCTOU) Race Condition in yarn - CVE-2019-15608
Published: March 15, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34750
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-15608
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Yarn
Affected software:
yarn
yarn
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
How to mitigate CVE-2019-15608
Install update from vendor's website.