CVE-2021-3962: Use After Free
First published: Mon Nov 15 2021(Updated: )
A flaw was found in ImageMagick where it did not properly sanitize certain input before using it to invoke convert processes. This flaw allows an attacker to create a specially crafted image that leads to a use-after-free vulnerability when processed by ImageMagick. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ImageMagick ImageMagick | =7.1.0-14 | |
| redhat/ImageMagick 7.1.0 | <15 | 15 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2023196
- https://github.com/ImageMagick/ImageMagick/commit/82775af03bbb10a0a1d0e15c0156c75673b4525e
- https://github.com/ImageMagick/ImageMagick/issues/4446
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2023211
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2023411
- https://github.com/ImageMagick/ImageMagick6/blob/main/coders/dcm.c#L3978
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2023196#c9
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2023196#c10
Frequently Asked Questions
What is CVE-2021-3962?
CVE-2021-3962 is a use-after-free vulnerability in ImageMagick.
How does CVE-2021-3962 affect ImageMagick?
CVE-2021-3962 affects ImageMagick versions 7.1.0-14 and earlier.
What is the severity of CVE-2021-3962?
CVE-2021-3962 has a severity score of 7.8 (high).
How can an attacker exploit CVE-2021-3962?
An attacker can exploit CVE-2021-3962 by creating a specially crafted image that triggers the use-after-free vulnerability when processed by ImageMagick.
Is there a fix for CVE-2021-3962?
Yes, a fix for CVE-2021-3962 is available in newer versions of ImageMagick.
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