In WriteOnePNGImage() of the PNG coder at coders/png.c, an improper call to AcquireVirtualMemory() and memset() allows for an out-of-bounds write later when PopShortPixel() from MagickCore/quantum-private.h is called. The patch fixes the calls by adding 256 to rowbytes. An attacker who is able to supply a specially crafted image could affect availability with a low impact to data integrity. This flaw affects ImageMagick versions prior to 6.9.10-68 and 7.0.8-68.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25664
Reference (s):
- FEDORA:FEDORA-2021-b58af96f33
- URL: https://lists.fedoraproject.org/archives/list/[email protected]/message/Z3J6D7POCQYQKNVRDYLTTPM5SQC3WVTR/
- https://bugzilla.redhat.com/show_bug.cgi?id=1891605
- URL: https://bugzilla.redhat.com/show_bug.cgi?id=1891605