Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.

The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8815-1 advisory.

    It was discovered that libass incorrectly handled parsing operations for specific nested character     strings. An attacker could use this issue to cause libass to crash, resulting in a denial of service, or     possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04     LTS and Ubuntu 20.04 LTS. (CVE-2020-24994)

    It was discovered that libass incorrectly handled certain outline processing operations. An attacker could     use this issue to cause libass to crash, resulting in a denial of service. This issue only affected Ubuntu     18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-26682)

    It was discovered that libass incorrectly handled certain ASS subtitle files when measuring wrapped lines.
    An attacker could use this issue to cause libass to crash, resulting in a denial of service, or possibly     execute arbitrary code. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-61627)

    It was discovered that libass incorrectly handled certain Matroska subtitle chunks with negative ReadOrder     values. An attacker could use this issue to cause libass to crash, resulting in a denial of service, or     possibly execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-61626)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4797-1 advisory.

    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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2021:1664-1 advisory.

  - Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote     attackers to cause a denial of service or remote code execution via a crafted file. (CVE-2020-24994)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

This update for libass fixes the following issues :

  - CVE-2020-24994: Fixed a stack overflow in the parse_tag     (bsc#1184153).

This update was imported from the SUSE:SLE-15:Update update project.

This update for libass fixes the following issues :

CVE-2020-24994: Fixed a stack overflow in the parse_tag (bsc#1184153).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Type	Severity
350176	Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS : libass vulnerabilities (USN-8815-1)	Nessus	Ubuntu Local Security Checks	Local	high
183548	Ubuntu 16.04 ESM : LibASS vulnerabilities (USN-4797-1)	Nessus	Ubuntu Local Security Checks	Local	high
151712	openSUSE 15 Security Update : libass (openSUSE-SU-2021:1664-1)	Nessus	SuSE Local Security Checks	Local	high
149894	openSUSE Security Update : libass (openSUSE-2021-773)	Nessus	SuSE Local Security Checks	Local	high
149856	SUSE SLED15 / SLES15 Security Update : libass (SUSE-SU-2021:1664-1)	Nessus	SuSE Local Security Checks	Local	high

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CVE-2020-24994

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