Bug 1928943 (CVE-2021-20245)

Summary:	CVE-2021-20245 ImageMagick: Division by zero in WriteAnimatedWEBPImage() in coders/webp.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 coders/webp.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 19:02:59 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:	1929889, 1929890
Bug Blocks:	1928960, 1928961

Description Pedro Sampaio 2021-02-15 20:30:52 UTC

A flaw was found in ImageMagick in coders/webp.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/3176

Comment 1 RaTasha Tillery-Smith 2021-02-16 14:42:04 UTC

External References:

https://github.com/ImageMagick/ImageMagick/issues/3176

Comment 2 Todd Cullum 2021-02-17 20:34:26 UTC

Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1929889]
Affects: fedora-all [bug 1929890]

Comment 3 Todd Cullum 2021-02-17 20:40:13 UTC

Flaw summary:

When image->ticks_per_second is set to 0 in WriteAnimatedWEBPImage() of ImageMagick/coders/webp.c, a division by zero could occur, causing an impact to application availability if an attacker is able to submit a crafted input image file to be processed by ImageMagick. This is because  image->ticks_per_second is acquired from the image file. The patch addresses the issue by using the PerceptibleReciprocal() function instead of division.

Comment 4 Todd Cullum 2021-02-17 20:40:24 UTC

Upstream patch: https://github.com/ImageMagick/ImageMagick6/commit/a78d92dc0f468e79c3d761aae9707042952cdaca

Comment 5 Todd Cullum 2021-02-17 20:41:28 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 6 Product Security DevOps Team 2021-02-18 19:02:59 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-2021-20245