UBUNTU-CVE-2021-33643

    Dashboard / Vulnerabilities / UBUNTU-CVE-2021-33643

    UBUNTU-CVE-2021-33643

    Published: 10 Aug 2022Last Modified: 25 Jun 2026
    Upstream:
    CVE-2021-33643
    Aliases:
    USN-7398-1

    Summary:

    Details: An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.

    References: https://ubuntu.com/security/CVE-2021-33643, https://www.cve.org/CVERecord?id=CVE-2021-33643, https://bugzilla.redhat.com/show_bug.cgi?id=2121289, https://ubuntu.com/security/notices/USN-7398-1

    Affected packages

    Package

    Name: libtar

    Purl: pkg:deb/ubuntu/libtar?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.2.20-4ubuntu0.1~esm1

    Affected versions

    1.2.20-4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-33643 | CVE-DB