Bug 1891934 (CVE-2020-25676)

Summary:	CVE-2020-25676 ImageMagick: outside the range of representable values of type 'long' and integer overflow at MagickCore/pixel.c and MagickCore/cache.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fedora, jhorak, mike, pahan, rhel8-maint, security-response-team, stransky
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ImageMagick 7.0.9-0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found ImageMagick. Multiple unconstrained pixel offset calculations produce undefined behavior in the form of out-of-range and integer overflows. These instances of undefined behavior could be triggered by an attacker who is able to supply a crafted input file. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-24 23:34:14 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:	1901239, 1901240, 1910558
Bug Blocks:	1891602

Description Guilherme de Almeida Suckevicz 2020-10-27 17:39:18 UTC

In ImageMagick 7.0.8-68 there are 2 outside the range of representable values of type 'long' and 5 integer overflow at MagickCore/pixel.c,cache.c.

Reference:
https://github.com/ImageMagick/ImageMagick/issues/1732

Upstream patch:
https://github.com/ImageMagick/ImageMagick/commit/406da3af9e09649cda152663c179902edf5ab3ac

Comment 1 Todd Cullum 2020-10-28 22:53:22 UTC

Flaw summary:

In CatromWeights(), MeshInterpolate(), InterpolatePixelChannel(), InterpolatePixelChannels(), and InterpolatePixelInfo(), which are all functions in /MagickCore/pixel.c, there were multiple unconstrained pixel offset calculations which were being used with the floor() function. These calculations produced undefined behavior in the form of out-of-range and integer overflows, as identified by UndefinedBehaviorSanitizer.

These instances of undefined behavior could be triggered by an attacker who is able to supply a crafted input file to be processed by ImageMagick. These issues could impact application availability or potentially cause other problems related to undefined behavior.

Comment 2 Todd Cullum 2020-10-28 22:56:45 UTC

Acknowledgments:

Name: Suhwan Song (Seoul National University)

Comment 3 Todd Cullum 2020-10-29 19:16:20 UTC

Statement:

This flaw is out of support scope for Red Hat Enterprise Linux 5, 6, and 7. Inkscape is not affected because it no longer uses a bundled ImageMagick in Red Hat Enterprise Linux 8. For more information regarding support scopes, please see https://access.redhat.com/support/policy/updates/errata .

Comment 4 Guilherme de Almeida Suckevicz 2020-11-24 19:07:07 UTC

Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1901239]
Affects: fedora-all [bug 1901240]

Comment 5 Product Security DevOps Team 2020-11-24 23:34:14 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-2020-25676