UBUNTU-CVE-2021-41072

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    UBUNTU-CVE-2021-41072

    Published: 14 Sept 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-41072

    Summary:

    Details: squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

    References: https://ubuntu.com/security/CVE-2021-41072, https://github.com/plougher/squashfs-tools/commit/e0485802ec72996c20026da320650d8362f555bd, https://github.com/plougher/squashfs-tools/issues/72#issuecomment-913833405, https://ubuntu.com/security/notices/USN-5078-1, https://ubuntu.com/security/notices/USN-5078-2, https://www.cve.org/CVERecord?id=CVE-2021-41072, https://ubuntu.com/security/notices/USN-5078-3

    Affected packages

    Package

    Name: squashfs-tools

    Purl: pkg:deb/ubuntu/squashfs-tools@1:4.3-3ubuntu2.16.04.3+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:4.3-3ubuntu2.16.04.3+esm1

    Affected versions

    1:4.2+20130409-2.1

    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-2021-41072 | CVE-DB