CVE-2019-9719: Buffer Overflow
First published: Thu Sep 19 2019(Updated: )
** DISPUTED ** A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf. NOTE: Third parties dispute that this is a vulnerability because “no evidence of a vulnerability is provided” and only “a generic warning from a static code analysis” is provided.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| libavutil | <=12.3 |
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Reference Links
- https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L113
- https://github.com/libav/libav/commits/master/libavcodec/srtdec.c
- https://lgtm.com/projects/g/libav/libav/snapshot/f5f553ca3bdca0c97dd08bbf002f0d8cb193788b/files/libavcodec/srtdec.c?sort=name&dir=ASC&mode=heatmap#xeec693aa6d85853b:1
- https://lgtm.com/security/
Frequently Asked Questions
What is the severity of CVE-2019-9719?
The severity of CVE-2019-9719 is currently disputed, with some claiming it does not constitute a vulnerability due to lack of evidence of exploitability.
How do I fix CVE-2019-9719?
To address CVE-2019-9719, it is recommended to upgrade to a newer version of Libav beyond 12.3 where this issue is resolved.
What product versions are affected by CVE-2019-9719?
CVE-2019-9719 affects Libav versions up to and including 12.3.
What type of attack can exploit CVE-2019-9719?
CVE-2019-9719 can potentially be exploited by attackers through a crafted video file in Matroska format that triggers a stack-based buffer overflow.
What component of Libav is involved in CVE-2019-9719?
The subtitle decoder component in Libav is involved in CVE-2019-9719, specifically the srt_to_ass function in the srtdec.c file.
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