CVE Vulnerabilities

CVE-2019-15608

Time-of-check Time-of-use (TOCTOU) Race Condition

Published: Mar 15, 2020 | Modified: Mar 21, 2020
CVSS 3.x
5.9
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
4.4 MODERATE
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
Ubuntu
LOW

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

Weakness

The product checks the state of a resource before using that resource, but the resource’s state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

Affected Software

Name Vendor Start Version End Version
Yarn Yarnpkg * 1.19.0 (excluding)
Node-yarnpkg Ubuntu eoan *
Node-yarnpkg Ubuntu trusty *
Node-yarnpkg Ubuntu upstream *

Potential Mitigations

References