Bug 1889812 (CVE-2020-1914)

Summary:	CVE-2020-1914 hermes: Out of bounds read in SaveGeneratorLong instruction
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2021-10-28 05:27:14 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Michael Kaplan 2020-10-20 15:55:07 UTC

A logic vulnerability when handling the SaveGeneratorLong instruction in Facebook Hermes prior to commit b2021df620824627f5a8c96615edbd1eb7fdddfc allows attackers to potentially read out of bounds or theoretically execute arbitrary code via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.

Reference:

https://github.com/facebook/hermes/commit/b2021df620824627f5a8c96615edbd1eb7fdddfc
https://www.facebook.com/security/advisories/cve-2020-1914