Bug 1708107 (CVE-2019-9721)

Summary:	CVE-2019-9721 ffmpeg: complex format argument in handle_open_brace in libavcodec/htmlsubtitles.c causing denial of service
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	kem
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2019-05-14 15:44:24 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1708110

Description Dhananjay Arunesh 2019-05-09 07:29:30 UTC

A denial of service in the subtitle decoder in FFmpeg 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handle_open_brace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Upstream commit:
https://git.ffmpeg.org/gitweb/ffmpeg.git/commitdiff/894995c41e0795c7a44f81adc4838dedc3932e65

Comment 1 Stefan Cornelius 2019-05-14 15:44:27 UTC

Statement:

This issue did not affect the versions of qffmpeg as shipped with Red Hat Enterprise Linux 5.