Bug 1894239 (CVE-2020-27760) - CVE-2020-27760 ImageMagick: division by zero at MagickCore/enhance.c
Summary: CVE-2020-27760 ImageMagick: division by zero at MagickCore/enhance.c
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-27760
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1901265 1901266 1910545
Blocks: 1891602
TreeView+ depends on / blocked
 
Reported: 2020-11-03 19:21 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-15 19:26 UTC (History)
7 users (show)

Fixed In Version: ImageMagick 7.0.8-68
Doc Type: If docs needed, set a value
Doc Text:
In `GammaImage()` of /MagickCore/enhance.c, depending on the `gamma` value, it is possible to trigger a divide-by-zero condition when a crafted input file is processed by ImageMagick. The patch uses the `PerceptibleReciprocal()` to prevent the divide-by-zero from occurring. This issue could lead to an impact on application availability.
Clone Of:
Environment:
Last Closed: 2020-11-24 23:34:47 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-11-03 19:21:45 UTC 
In ImageMagick, there is a division by zero at MagickCore/enhance.c.

Reference:
https://github.com/ImageMagick/ImageMagick/issues/1717

Upstream patch:
https://github.com/ImageMagick/ImageMagick/commit/c5fcdea6a6ae27cf3db20c28b176e87b1a584e06
Comment 1 Guilherme de Almeida Suckevicz 2020-11-03 19:21:48 UTC 
Acknowledgments:

Name: Suhwan Song (Seoul National University)
Comment 2 Todd Cullum 2020-11-04 20:37:13 UTC 
Flaw summary:

In `GammaImage()` of /MagickCore/enhance.c, depending on the `gamma` value, it's possible to trigger a divide-by-zero condition when a crafted input file is processed by ImageMagick. This could lead to an impact to application availability. The patch uses the `PerceptibleReciprocal()` to prevent the divide-by-zero from occurring.
Comment 3 Todd Cullum 2020-11-04 20:37:57 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 19:23:09 UTC 
Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1901265]
Affects: fedora-all [bug 1901266]
Comment 5 Product Security DevOps Team 2020-11-24 23:34:47 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-2020-27760
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