Bug 1894680 (CVE-2020-27762)

Summary:	CVE-2020-27762 ImageMagick: outside the range of representable values of type 'unsigned char' at coders/hdr.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:	low	Docs Contact:
Priority:	low
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 7.0.8-68	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in ImageMagick in coders/hdr.c. An attacker who submits a crafted file that is processed by ImageMagick could trigger undefined behavior in the form of values outside the range of type `unsigned char`. This would most likely lead to an impact to application availability, but could potentially cause other problems related to undefined behavior.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-24 23:34:53 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:	1901269, 1901270, 1910543
Bug Blocks:	1891602

Description Guilherme de Almeida Suckevicz 2020-11-04 18:58:35 UTC

In ImageMagick, there are 3 outside the range of representable values of type 'unsigned char' at coders/hdr.c.

Reference:
https://github.com/ImageMagick/ImageMagick/issues/1713

Upstream patch:
https://github.com/ImageMagick/ImageMagick/commit/7db3fa20893d557259da6e99e111954de83d2495

Comment 1 Guilherme de Almeida Suckevicz 2020-11-04 18:58:38 UTC

Acknowledgments:

Name: Suhwan Song (Seoul National University)

Comment 2 Todd Cullum 2020-11-04 22:02:52 UTC

`WriteHDRImage()` in /coders/hdr.c could attempt to set unsigned chars to values outside of range, depending on pixel color values. The patch adds checks for > 0 to ensure that this does not occur. The flaw could be triggered by a crafted input file that is processed by ImageMagick. Red Hat Product Security marked this as Low severity because although it could potentially lead to an impact to application availability, no specific impact was shown in this case.

Comment 3 Todd Cullum 2020-11-04 22:03:25 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 19:24:03 UTC

Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1901269]
Affects: fedora-all [bug 1901270]

Comment 5 Product Security DevOps Team 2020-11-24 23:34:53 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-2020-27762