CVE-2019-9721

A denial of service in the subtitle decoder in FFmpeg 3.2 and 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handleopenbrace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

References

Affected packages

Git / github.com/ffmpeg/ffmpeg

Affected ranges

Type: GIT
Repo: https://github.com/ffmpeg/ffmpeg
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

273f2755ce8635d42da3cde0eeba15b2e7842774

Affected versions

Other

n0.*

n0.11-dev

n0.12-dev

n0.8

n1.*

n1.1-dev

n1.2-dev

n1.3-dev

n2.*

n2.0

n2.1-dev

n2.2-dev

n2.3-dev

n2.4-dev

n2.5-dev

n2.6-dev

n2.7-dev

n2.8-dev

n2.9-dev

n3.*

n3.1-dev

n3.2

n3.2-dev

n3.2.1

n3.2.10

n3.2.11

n3.2.12

n3.2.13

n3.2.2

n3.2.3

n3.2.4

n3.2.5

n3.2.6

n3.2.7

n3.2.8

n3.2.9

Database specific

vanir_signatures

[
    {
        "deprecated": false,
        "id": "CVE-2019-9721-1e4b4ede",
        "signature_type": "Function",
        "digest": {
            "length": 3610.0,
            "function_hash": "51195086334001458191859035190219042570"
        },
        "target": {
            "file": "libavcodec/htmlsubtitles.c",
            "function": "ff_htmlmarkup_to_ass"
        },
        "source": "https://github.com/ffmpeg/ffmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774",
        "signature_version": "v1"
    },
    {
        "deprecated": false,
        "id": "CVE-2019-9721-efb6ae89",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "181052376676104601782979859616773957010",
                "114335331683057061847747733341231002884",
                "52182576610393413327815494532710655027",
                "151988408299784471571915177291850664201",
                "143530476180291881434987183528048468203",
                "20671168889515778463202263099394878314",
                "117734745311139794259276495167403311113",
                "247691314197916473622205852293270336349",
                "91970035849042864838408869607449612939",
                "298548214798456625181670453837162301144",
                "51594798183235078235674705393957355135",
                "244888744203267073148994254791264550488"
            ],
            "threshold": 0.9
        },
        "target": {
            "file": "libavcodec/htmlsubtitles.c"
        },
        "source": "https://github.com/ffmpeg/ffmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774",
        "signature_version": "v1"
    }
]