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    CVE-2018-20482

    GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

    Published:Dec 26, 2018
    Last Modified:Nov 21, 2024
    EPS:Dec 26, 2018
    EPSS Score:0.00021
    CVSS Score:4.7

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Gnu
    Product
    Tar
    Vendor
    Opensuse
    Product
    Leap

    Exploits

    https://news.ycombinator.com/item?id=18745431https://news.ycombinator.com/item?id=18745431

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454
    http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html
    http://www.securityfocus.com/bid/106354
    https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html
    https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html
    https://news.ycombinator.com/item?id=18745431
    https://security.gentoo.org/glsa/201903-05
    https://twitter.com/thatcks/status/1076166645708668928
    https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug
    http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454
    http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
    http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html
    http://www.securityfocus.com/bid/106354
    https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html
    https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html
    https://news.ycombinator.com/item?id=18745431
    https://security.gentoo.org/glsa/201903-05
    https://twitter.com/thatcks/status/1076166645708668928
    https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug

    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