USN-4797-1

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/notices/USN-4797-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4797-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4797-1
Upstream
Related
Published
2022-05-04T10:38:06.348811Z
Modified
2025-10-13T04:35:23Z
Summary
libass vulnerabilities
Details

It was discovered that LibASS incorrectly handled certain ASS files. A remote attacker could possibly use this issue to cause a denial of service. One of the issues, CVE-2016-7970, only affected Ubuntu 16.04 ESM. (CVE-2016-7969, CVE-2016-7970, CVE-2016-7972)

It was discovered that LibASS incorrectly handled parsing operations for specific nested character strings. An attacker could possibly use this issue to cause a denial of service. This issue was only fixed in Ubuntu 16.04 LTS. (CVE-2020-24994)

References

Affected packages

Ubuntu:Pro:14.04:LTS / libass

Package

Name
libass
Purl
pkg:deb/ubuntu/libass@0.10.1-3ubuntu1+esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.10.1-3ubuntu1+esm1

Affected versions

0.*

0.10.1-1ubuntu1
0.10.1-3
0.10.1-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libass-dev",
            "binary_version": "0.10.1-3ubuntu1+esm1"
        },
        {
            "binary_name": "libass4",
            "binary_version": "0.10.1-3ubuntu1+esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2016-7969",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        },
        {
            "id": "CVE-2016-7972",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:14.04:LTS"
}

Ubuntu:Pro:16.04:LTS / libass

Package

Name
libass
Purl
pkg:deb/ubuntu/libass@0.13.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.13.1-1ubuntu0.1~esm2

Affected versions

0.*

0.12.3-2
0.13.0-1
0.13.1-1
0.13.1-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libass-dev",
            "binary_version": "0.13.1-1ubuntu0.1~esm2"
        },
        {
            "binary_name": "libass5",
            "binary_version": "0.13.1-1ubuntu0.1~esm2"
        }
    ],
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2020-24994",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}