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CVE-2020-25674

Published: 8 December 2020

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.

Priority

Low

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
imagemagick
Launchpad, Ubuntu, Debian
bionic
Released (8:6.9.7.4+dfsg-16ubuntu6.11)
focal
Released (8:6.9.10.23+dfsg-2.1ubuntu11.4)
groovy
Released (8:6.9.10.23+dfsg-2.1ubuntu13.3)
hirsute Not vulnerable
(8:6.9.11.60+dfsg-1ubuntu1)
impish Not vulnerable
(8:6.9.11.60+dfsg-1ubuntu1)
jammy Not vulnerable
(8:6.9.11.60+dfsg-1ubuntu1)
kinetic Not vulnerable
(8:6.9.11.60+dfsg-1ubuntu1)
precise Does not exist

trusty Needs triage

upstream
Released (8:6.9.11.24+dfsg-1)
xenial
Released (8:6.8.9.9-7ubuntu5.16+esm2)
Patches:
upstream: https://github.com/ImageMagick/ImageMagick6/commit/2fdff8e040cd4401498d89f3c3d1f89cffd118b0

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H