Bug 1928941 (CVE-2021-20246)

Summary:	CVE-2021-20246 ImageMagick: Division by zero in ScaleResampleFilter in MagickCore/resample.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fedora, jhorak, mike, pahan
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ImageMagick 6.9.11-62, ImageMagick 7.0.10-62	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in ImageMagick in MagickCore/resample.c. An attacker who submits a crafted file that is processed by ImageMagick could trigger undefined behavior in the form of math division by zero. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-02-18 19:02:56 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:	1929886, 1929887
Bug Blocks:	1928960, 1928961

Description Pedro Sampaio 2021-02-15 20:26:40 UTC

A flaw was found in ImageMagick in MagickCore/resample.c. An attacker who submits a crafted file that is processed by ImageMagick could trigger undefined behavior in the form of math division by zero. This would most likely lead to an impact to application availability, but could potentially cause other problems related to undefined behavior. This flaw affects ImageMagick versions prior to 7.0.10-62.

Upstream issue:

https://github.com/ImageMagick/ImageMagick/issues/3195

Comment 1 Todd Cullum 2021-02-17 20:14:51 UTC

Upstream patch: https://github.com/ImageMagick/ImageMagick/commit/8d25d94a363b104acd6ff23df7470aeedb806c51

Comment 2 Todd Cullum 2021-02-17 20:25:48 UTC

Flaw summary:

If resample_filter->support is set to 0, a divide-by-zero can occur on 2 lines of ScaleResampleFilter() in MagickCore/resample.c. Because the resample_filter is acquired from the image[1], a crafted image could potentially trigger this flaw and cause a crash, affecting application availability.

1. https://github.com/ImageMagick/ImageMagick/blob/8d25d94a363b104acd6ff23df7470aeedb806c51/MagickCore/resample.c

Comment 3 Todd Cullum 2021-02-17 20:27:59 UTC

Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1929886]
Affects: fedora-all [bug 1929887]

Comment 4 Todd Cullum 2021-02-17 20:35:36 UTC

Statement:

This flaw is out of support scope for Red Hat Enterprise Linux 6 and 7. To learn more about Red Hat Enterprise Linux support scope, please see https://access.redhat.com/support/policy/updates/errata/ .

Comment 5 Product Security DevOps Team 2021-02-18 19:02:56 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-20246