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    CVE-2021-40153

    squashfs_opendir in unsquash-1.c in Squashfs-Tools 4.5 stores the filename in the directory entry; this is then used by unsquashfs to create the new file during the unsquash. The filename is not validated for traversal outside of the destination directory, and thus allows writing to locations outside of the destination.

    Published:Sep 10, 2019
    Last Modified:Nov 21, 2024
    EPS:Aug 27, 2021
    EPSS Score:0.00496
    CVSS Score:8.1

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Squashfs-tools Project
    Product
    Squashfs-tools

    Exploits

    https://github.com/plougher/squashfs-tools/issues/72https://github.com/plougher/squashfs-tools/issues/72

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    References

    https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790
    https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646
    https://github.com/plougher/squashfs-tools/issues/72
    https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
    https://security.gentoo.org/glsa/202305-29
    https://www.debian.org/security/2021/dsa-4967
    https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790
    https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646
    https://github.com/plougher/squashfs-tools/issues/72
    https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
    https://security.gentoo.org/glsa/202305-29
    https://www.debian.org/security/2021/dsa-4967

    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