#VU30550 Link following in yarn - CVE-2019-10773
Published: December 16, 2019 / Updated: July 17, 2020
Vulnerability identifier: #VU30550
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2019-10773
CWE-ID: CWE-59
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
yarn
yarn
Software vendor:
Yarn
Yarn
Description
The vulnerability allows a local non-authenticated attacker to execute arbitrary code.
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.
Remediation
Install update from vendor's website.
External links
- https://access.redhat.com/errata/RHSA-2020:0475
- 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://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3FHYKZ6ZJ5/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITY5BC63CCC647DFNUQRQ5AJDKUKUNBI/
- https://snyk.io/vuln/SNYK-JS-YARN-537806,