Bug 1934088 (CVE-2021-3420)

Summary:	CVE-2021-3420 newlib: improper validation in memory allocation functions could lead to heap-based buffer overflow
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mhlavink
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	newlib 4.0.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-02 19:02:12 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1934089
Bug Blocks:	1934090

Description Guilherme de Almeida Suckevicz 2021-03-02 13:47:09 UTC

A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.

Reference and upstream patch:
https://sourceware.org/git/?p=newlib-cygwin.git;a=commit;h=aa106b29a6a8a1b0df9e334704292cbc32f2d44e

Comment 1 Guilherme de Almeida Suckevicz 2021-03-02 13:47:25 UTC

Created arm-none-eabi-newlib tracking bugs for this issue:

Affects: fedora-all [bug 1934089]

Comment 2 Product Security DevOps Team 2021-03-02 19:02:12 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.