{"id":"USN-4797-1","summary":"libass vulnerabilities","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","modified":"2026-05-20T16:03:05.928301428Z","published":"2022-05-04T10:38:06Z","related":["UBUNTU-CVE-2016-7969","UBUNTU-CVE-2016-7970","UBUNTU-CVE-2016-7972","UBUNTU-CVE-2020-24994"],"upstream":["CVE-2016-7969","CVE-2016-7970","CVE-2016-7972","CVE-2020-24994","UBUNTU-CVE-2016-7969","UBUNTU-CVE-2016-7970","UBUNTU-CVE-2016-7972","UBUNTU-CVE-2020-24994"],"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"}],"affected":[{"package":{"name":"libass","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libass?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.1-3ubuntu1+esm1"}]}],"versions":["0.10.1-1ubuntu1","0.10.1-3","0.10.1-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libass4","binary_version":"0.10.1-3ubuntu1+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4797-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"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-2016-7969"},{"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"}],"id":"CVE-2016-7972"}]}}},{"package":{"name":"libass","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libass?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.13.1-1ubuntu0.1~esm2"}]}],"versions":["0.12.3-2","0.13.0-1","0.13.1-1","0.13.1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libass5","binary_version":"0.13.1-1ubuntu0.1~esm2"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4797-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[]}}}],"schema_version":"1.7.5"}