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    CVE-2021-32760

    containerd is a container runtime. A bug was found in containerd versions prior to 1.4.8 and 1.5.4 where pulling and extracting a specially-crafted container image can result in Unix file permission changes for existing files in the host’s filesystem. Changes to file permissions can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in containerd 1.5.4 and 1.4.8. As a workaround, ensure that users only pull images from trusted sources. Linux security modules (LSMs) like SELinux and AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with specific files.

    Published:Jul 19, 2021
    Last Modified:Nov 21, 2024
    EPS:Jul 19, 2021
    EPSS Score:0.00141
    CVSS Score:5

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Linuxfoundation
    Product
    Containerd
    Vendor
    Redhat
    Product
    Openstack
    Vendor
    Redhat
    Product
    Service Mesh

    Exploits

    No exploit reference

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    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