CVE-2023-49298

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CVE-2023-49298

Summary:

Details: OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenarios involving applications that try to rely on efficient copying of file data, can replace file contents with zero-valued bytes and thus potentially disable security mechanisms. NOTE: this issue is not always security related, but can be security related in realistic situations. A possible example is cp, from a recent GNU Core Utilities (coreutils) version, when attempting to preserve a rule set for denying unauthorized access. (One might use cp when configuring access control, such as with the /etc/hosts.deny file specified in the IBM Support reference.) NOTE: this issue occurs less often in version 2.2.1, and in versions before 2.1.4, because of the default configuration in those versions.

References: https://bugs.gentoo.org/917224, https://github.com/openzfs/zfs/releases/tag/zfs-2.1.14, https://github.com/openzfs/zfs/releases/tag/zfs-2.2.2, https://lists.debian.org/debian-lts-announce/2025/04/msg00009.html, https://news.ycombinator.com/item?id=38405731, https://news.ycombinator.com/item?id=38770168, https://web.archive.org/web/20231124172959/https://www.ibm.com/support/pages/how-remove-missing%C2%A0newline%C2%A0or%C2%A0line%C2%A0too%C2%A0long-error-etchostsallow%C2%A0and%C2%A0etchostsdeny-files, https://www.theregister.com/2023/12/04/two_new_versions_of_openzfs/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49298.json, https://nvd.nist.gov/vuln/detail/CVE-2023-49298, https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275308, https://github.com/openzfs/zfs/issues/15526, https://github.com/openzfs/zfs/pull/15571, https://lists.debian.org/debian-lts-announce/2024/03/msg00019.html