Bug 1894691 (CVE-2020-27770) - CVE-2020-27770 ImageMagick: unsigned offset overflowed at MagickCore/string.c
Summary: CVE-2020-27770 ImageMagick: unsigned offset overflowed at MagickCore/string.c
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2020-27770
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: 1901285 1901286 1910534
Blocks: 1891602
TreeView+ depends on / blocked
 
Reported: 2020-11-04 19:21 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-15 20:41 UTC (History)
7 users (show)

Fixed In Version: ImageMagick 7.0.8-68
Doc Type: If docs needed, set a value
Doc Text:
Due to a missing check for 0 value of `replace_extent`, it is possible for offset `p` to overflow in SubstituteString(), causing potential impact to application availability. This could be triggered by a crafted input file that is processed by ImageMagick.
Clone Of:
Environment:
Last Closed: 2020-11-24 23:35:18 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-11-04 19:21:56 UTC 
In ImageMagick, there is an integer overflow in MagickCore/string.c.

Reference:
https://github.com/ImageMagick/ImageMagick/issues/1721

Upstream patch:
https://github.com/ImageMagick/ImageMagick/commit/be90a5395695f0d19479a5d46b06c678be7f7927
Comment 1 Guilherme de Almeida Suckevicz 2020-11-04 19:21:58 UTC 
Acknowledgments:

Name: Suhwan Song (Seoul National University)
Comment 2 Todd Cullum 2020-11-05 23:06:54 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 3 Todd Cullum 2020-11-05 23:12:33 UTC 
Flaw summary:

Due to a missing check for 0 value of `replace_extent`, it is possible for offset `p` to overflow in SubstituteString(), causing potential impact to application availability. This could be triggered by a crafted input file that is processed by ImageMagick.
Comment 4 Guilherme de Almeida Suckevicz 2020-11-24 19:28:48 UTC 
Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1901285]
Affects: fedora-all [bug 1901286]
Comment 5 Product Security DevOps Team 2020-11-24 23:35:18 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-2020-27770
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