PT-2021-10256 · Facebook · Facebook Hermes

Published 2021-02-02 · Updated 2021-03-26 · CVE-2020-1896

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions: Facebook Hermes versions prior to commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2

Description: A stack overflow issue in the 'builtin apply' function of Facebook Hermes allows attackers to potentially execute arbitrary code via crafted JavaScript. This is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Most React Native applications are not affected.

Recommendations: For Facebook Hermes versions prior to commit 86543ac47e59c522976b5632b8bf9a2a4583c7d2, update to a version that includes the fix for this issue. As a temporary workaround, consider restricting the evaluation of untrusted JavaScript in applications using Hermes until a patch is available.

Fix

Memory Corruption

Stack Overflow

Weakness Enumeration

CWE-787

CWE-121

Related Identifiers

CVE-2020-1896

Affected Products

Facebook Hermes

References · 7

• https://github.com/facebook/hermes/commit/86543ac47e59c522976b5632b8bf9a2a4583c7d2 · Patch
• https://osv.dev/vulnerability/CVE-2020-1896 · Vendor Advisory
• https://facebook.com/security/advisories/cve-2020-1896 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-1896 · Security Note
• https://github.com/facebook/hermes · Note
• https://t.me/cvenotify/12073 · Telegram Post
• https://t.me/cvenotify/9235 · Telegram Post