Multiple vulnerabilities in FFmpeg

Published: 2019-03-12 | Updated: 2019-04-19

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-9718 CVE-2019-9721
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	FFmpeg Universal components / Libraries / Libraries used by multiple products
Vendor	ffmpeg.sourceforge.net

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU18320

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-9718

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the subtitle decoder in ff_htmlmarkup_to_ass() function in libavcodec/htmlsubtitles.c when processing video files in Matroska format. A remote attacker can create a specially crafted video file, pass it to the affected application and consume all available CPU resources.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FFmpeg: 4.1

CPE2.3

cpe:2.3:a:ffmpeg_sourceforge_net:ffmpeg:4.1:*:*:*:*:*:*:*

External links

https://www.securityfocus.com/bid/107382
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Input validation error

EUVDB-ID: #VU18321