PT-2019-12044 · Facebook+1 · Yarn+1

Published 2019-12-16 · Updated 2020-05-21 · CVE-2019-10773

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Yarn versions prior to 1.21.1

Description The package install functionality in Yarn can be exploited to create arbitrary symlinks on the host filesystem. This can be achieved by using specially crafted "bin" keys. Depending on the current user's permission set, existing files could be overwritten.

Recommendations For versions prior to 1.21.1, update to version 1.21.1 or later to resolve the issue. As a temporary workaround, consider restricting the package install functionality until the update is applied.

Exploit

Fix

OS Command Injection

Link Following

Weakness Enumeration

CWE-78

CWE-59

Related Identifiers

ALT-PU-2020-1415

ALT-PU-2020-1988

CVE-2019-10773

GHSA-5XF4-F2FQ-F69J

SNYK-JS-YARN-537806

Affected Products

Alt Linux

Yarn

References · 22

• 🔥 https://github.com/yarnpkg/yarn/issues/7761#issuecomment-565493023 · Exploit
• 🔥 https://blog.daniel-ruf.de/critical-design-flaw-npm-pnpm-yarn · Exploit
• https://github.com/yarnpkg/yarn/commit/039bafd74b7b1a88a53a54f8fa6fa872615e90e7 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2019-10773 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-10773 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-10773 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITY5BC63CCC647DFNUQRQ5AJDKUKUNBI · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-10773 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2020:0475 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2019-10773 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HIZW4NZVV5QY5WWGW2JRP3FHYKZ6ZJ5 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/ITY5BC63CCC647DFNUQRQ5AJDKUKUNBI · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-10773 · Security Note
• https://osv.dev/vulnerability/GHSA-5xf4-f2fq-f69j · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-10773 · Vendor Advisory