usn-4797-1
Vulnerability from osv_ubuntu
Published
2022-05-04 10:38
Modified
2026-06-29 10:52
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
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2016-7969",
              "severity": [
                {
                  "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": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2016-7972",
              "severity": [
                {
                  "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libass4",
            "binary_version": "0.10.1-3ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "libass",
        "purl": "pkg:deb/ubuntu/libass@0.10.1-3ubuntu1+esm1?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.10.1-3ubuntu1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10.1-1ubuntu1",
        "0.10.1-3",
        "0.10.1-3ubuntu1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-24994",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libass5",
            "binary_version": "0.13.1-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "libass",
        "purl": "pkg:deb/ubuntu/libass@0.13.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.13.1-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.12.3-2",
        "0.13.0-1",
        "0.13.1-1",
        "0.13.1-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that LibASS incorrectly handled certain ASS files. A remote\nattacker could possibly use this issue to cause a denial of service. One of\nthe issues, CVE-2016-7970, only affected Ubuntu 16.04 ESM.\n(CVE-2016-7969, CVE-2016-7970, CVE-2016-7972)\n\nIt was discovered that LibASS incorrectly handled parsing operations for\nspecific nested character strings. An attacker could possibly use this issue\nto cause a denial of service. This issue was only fixed in Ubuntu 16.04 LTS.\n(CVE-2020-24994)\n",
  "id": "USN-4797-1",
  "modified": "2026-06-29T10:52:49Z",
  "published": "2022-05-04T10:38:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4797-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-7969"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-7970"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2016-7972"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-24994"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "libass vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2016-7969",
    "UBUNTU-CVE-2016-7970",
    "UBUNTU-CVE-2016-7972",
    "UBUNTU-CVE-2020-24994"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.