CVE-2019-9718 Information

Description

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

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Reference

http://www.securityfocus.com/bid/107382 https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982 https://seclists.org/bugtraq/2019/May/60 https://usn.ubuntu.com/3967-1/ https://www.debian.org/security/2019/dsa-4449

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5