Out-of-bounds Read Affecting imagemagick package, versions <8:6.9.10.23+dfsg-2.1ubuntu13.3
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Test your applications- Snyk ID SNYK-UBUNTU2010-IMAGEMAGICK-1136898
- published 11 Jun 2021
- disclosed 8 Dec 2020
How to fix?
Upgrade Ubuntu:20.10 imagemagick to version 8:6.9.10.23+dfsg-2.1ubuntu13.3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream imagemagick package and not the imagemagick package as distributed by Ubuntu.
See How to fix? for Ubuntu:20.10 relevant fixed versions and status.
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. This flaw affects ImageMagick versions prior to 7.0.8-68.