CVE-2021-20243: Divide by Zero
First published: Mon Feb 15 2021(Updated: )
A flaw was found in ImageMagick in MagickCore/resize.c. An attacker who submits a crafted file that is processed by ImageMagick could trigger undefined behavior in the form of math division by zero. The highest threat from this vulnerability is to system availability.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ImageMagick ImageMagick | <7.0.10-62 | |
| Debian Debian Linux | =9.0 | |
| redhat/ImageMagick 7.0.10 | <62 | 62 |
| debian/imagemagick | <=8:6.9.10.23+dfsg-2.1+deb10u1 | 8:6.9.10.23+dfsg-2.1+deb10u7 8:6.9.11.60+dfsg-1.3+deb11u2 8:6.9.11.60+dfsg-1.3+deb11u3 8:6.9.11.60+dfsg-1.6 8:6.9.11.60+dfsg-1.6+deb12u1 8:6.9.12.98+dfsg1-5 8:6.9.12.98+dfsg1-5.2 |
| ubuntu/imagemagick | <8:6.9.7.4+dfsg-16ubuntu6.14 | 8:6.9.7.4+dfsg-16ubuntu6.14 |
| ubuntu/imagemagick | <8:6.9.10.23+dfsg-2.1ubuntu11.9 | 8:6.9.10.23+dfsg-2.1ubuntu11.9 |
| ubuntu/imagemagick | <8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+ | 8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+ |
| ubuntu/imagemagick | <8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1 | 8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1 |
| ubuntu/imagemagick | <8:6.9.11.60+dfsg-1.3ubuntu1 | 8:6.9.11.60+dfsg-1.3ubuntu1 |
| ubuntu/imagemagick | <8:6.9.11.60+dfsg-1.3ubuntu1 | 8:6.9.11.60+dfsg-1.3ubuntu1 |
| ubuntu/imagemagick | <8:6.9.11.60+dfsg-1.3ubuntu1 | 8:6.9.11.60+dfsg-1.3ubuntu1 |
| ubuntu/imagemagick | <8:6.7.7.10-6ubuntu3.13+ | 8:6.7.7.10-6ubuntu3.13+ |
| ubuntu/imagemagick | <8:6.8.9.9-7ubuntu5.16+ | 8:6.8.9.9-7ubuntu5.16+ |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1928958
- https://github.com/ImageMagick/ImageMagick/pull/3193
- https://lists.debian.org/debian-lts-announce/2021/06/msg00000.html
- https://lists.debian.org/debian-lts-announce/2023/05/msg00020.html
- https://launchpad.net/bugs/cve/CVE-2021-20243
- https://access.redhat.com/support/policy/updates/errata/
- https://access.redhat.com/security/cve/cve-2021-20243
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1932009
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1932010
- https://github.com/ImageMagick/ImageMagick/commit/9751bd619872c8e58609fbed56c4827afa083b40
- https://github.com/ImageMagick/ImageMagick6/commit/53cb91b3e7bf95d0e372cbc745e0055ac6054745
- https://security-tracker.debian.org/tracker/CVE-2021-20243
- https://ubuntu.com/security/notices/USN-5335-1
- https://ubuntu.com/security/notices/USN-5736-1
- https://ubuntu.com/security/notices/USN-5736-2
- https://ubuntu.com/security/notices/USN-6200-1
- https://www.cve.org/CVERecord?id=CVE-2021-20243
- https://nvd.nist.gov/vuln/detail/CVE-2021-20243
- https://ubuntu.com/security/CVE-2021-20243
Frequently Asked Questions
What is the severity of CVE-2021-20243?
The severity of CVE-2021-20243 is medium with a severity value of 5.5.
How does CVE-2021-20243 affect ImageMagick?
CVE-2021-20243 affects ImageMagick versions 8:6.9.7.4+dfsg-16ubuntu6.14, 8:6.9.10.23+dfsg-2.1ubuntu11.9, 8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+, 8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1, 8:6.9.11.60+dfsg-1.3ubuntu1, 8:6.7.7.10-6ubuntu3.13+, and 8:6.8.9.9-7ubuntu5.16+.
How can an attacker exploit CVE-2021-20243?
An attacker can exploit CVE-2021-20243 by submitting a crafted file that is processed by ImageMagick, triggering undefined behavior in the form of math division by zero.
How can I fix CVE-2021-20243 on Ubuntu?
To fix CVE-2021-20243 on Ubuntu, upgrade ImageMagick to versions 8:6.9.7.4+dfsg-16ubuntu6.14, 8:6.9.10.23+dfsg-2.1ubuntu11.9, 8:6.9.11.60+dfsg-1.3ubuntu0.22.04.3+, 8:6.9.11.60+dfsg-1.3ubuntu0.22.10.1, or 8:6.9.11.60+dfsg-1.3ubuntu1 depending on your Ubuntu version.
Is there a fix available for CVE-2021-20243 on Debian?
Yes, there is a fix available for CVE-2021-20243 on Debian. Upgrade ImageMagick to versions 8:6.9.10.23+dfsg-2.1+deb10u5 or 8:6.9.11.60+dfsg-1.6 depending on your Debian version.
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