Bug 1891928 (CVE-2020-25674) - CVE-2020-25674 ImageMagick: heap-based buffer overflow in WriteOnePNGImage in coders/png.c
Summary: CVE-2020-25674 ImageMagick: heap-based buffer overflow in WriteOnePNGImage in...
Alias: CVE-2020-25674
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1901233 1901235 1910560
Blocks: 1891602
TreeView+ depends on / blocked
Reported: 2020-10-27 17:17 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-11 18:43 UTC (History)
7 users (show)

Fixed In Version: ImageMagick 7.0.8-68
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in ImageMagick. When the colormap has less than 256 valid values, the loop condition will continue to loop 256 times, attempting to pass invalid colormap data to the event logger, leading to an improper exit condition and an out-of-bounds read via heap-buffer-overflow. The highest threat from this vulnerability is to system availability.
Clone Of:
Last Closed: 2020-11-24 23:34:08 UTC

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-10-27 17:17:29 UTC
In ImageMagick 7.0.8-67 there is a heap-buffer-overflow at coders/png.c:9026:46 in WriteOnePNGImage.


Upstream patch:

Comment 1 Todd Cullum 2020-10-28 21:45:38 UTC
Flaw summary:

WriteOnePNGImage() from coders/png.c (the PNG coder) has a for loop with an improper exit condition that can allow an out-of-bounds READ via heap-buffer-overflow. This occurs because it is possible for the colormap to have less than 256 valid values but the loop condition will loop 256 times, attempting to pass invalid colormap data to the event logger. The patch replaces the hardcoded 256 value with a call to MagickMin() to ensure the proper value is used.

This could impact application availability when a specially crafted input file is processed by ImageMagick.

Comment 2 Todd Cullum 2020-10-28 21:49:20 UTC

Name: Suhwan Song (Seoul National University)

Comment 4 Guilherme de Almeida Suckevicz 2020-11-24 19:04:11 UTC
Created ImageMagick tracking bugs for this issue:

Affects: epel-8 [bug 1901233]
Affects: fedora-all [bug 1901235]

Comment 5 Product Security DevOps Team 2020-11-24 23:34:08 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


Comment 7 Eric Christensen 2021-02-11 18:43:24 UTC

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.

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