CVE-2021-21844: Buffer Overflow
First published: Wed Aug 18 2021(Updated: )
Multiple exploitable integer overflow vulnerabilities exist within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. A specially crafted MPEG-4 input when encountering an atom using the “stco” FOURCC code, can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability.
Credit: talos-cna@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/gpac | 0.5.2-426-gc5ad4e4+dfsg5-5 1.0.1+dfsg1-4+deb11u3 2.2.1+dfsg1-3 | |
| GPAC MP4Box | =1.0.1 | |
| Debian | =10.0 | |
| Debian | =11.0 |
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Reference Links
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1297
- https://github.com/gpac/gpac/commit/b515fd04f5f00f4a99df741042f1efb31ad56351
- https://github.com/gpac/gpac/issues/1814
- https://security-tracker.debian.org/tracker/CVE-2021-21844
- https://www.debian.org/security/2021/dsa-4966
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1297
Frequently Asked Questions
What is the severity of CVE-2021-21844?
CVE-2021-21844 is classified as a high severity vulnerability due to its potential to lead to arbitrary code execution.
How do I fix CVE-2021-21844?
To mitigate CVE-2021-21844, upgrade to a version of GPAC that is not vulnerable, such as 0.5.2-426-gc5ad4e4+dfsg5-5 or later.
What software is affected by CVE-2021-21844?
CVE-2021-21844 affects multiple versions of the GPAC software library, specifically version 1.0.1 and earlier.
What could exploit CVE-2021-21844?
An attacker could exploit CVE-2021-21844 by crafting a specially designed MPEG-4 file that triggers the integer overflow vulnerability.
Is CVE-2021-21844 still exploitable in the latest GPAC versions?
No, CVE-2021-21844 has been addressed in later updates of the GPAC library, making it no longer exploitable.
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