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.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4114 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4114-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Daniel Leidert     April 05, 2025                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : zfs-linux     Version        : 2.0.3-9+deb11u2     CVE ID         : CVE-2013-20001 CVE-2023-49298     Debian Bug     : 1056752 1059322

    Multiple vulnerabilities were found in zfs-linux, the OpenZFS     filesystem for Linux.

    CVE-2013-20001

       When an NFS share is exported to IPv6 addresses via the sharenfs        feature, there is a silent failure to parse the IPv6 address data, and        access is allowed to everyone. IPv6 restrictions from the configuration        are not applied. With the fix, recognize when the host part of a        sharenfs attribute is an ipv6 Literal, and pass that through without        modification.

    CVE-2023-49298

       Check dnode and its data for dirtiness to prevent applications from        inadvertently replacing file contents with zero-valued bytes and        thus potentially disabling security mechanisms.

    For Debian 11 bullseye, these problems have been fixed in version     2.0.3-9+deb11u2.

    We recommend that you upgrade your zfs-linux packages.

    For the detailed security status of zfs-linux please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/zfs-linux

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2023-49298)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3766 advisory.

    - -----------------------------------------------------------------------     Debian LTS Advisory DLA-3766-1              debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Utkarsh Gupta     March 19, 2024                              https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : zfs-linux     Version        : 0.7.12-2+deb10u3     CVE ID         : CVE-2013-20001 CVE-2023-49298     Debian Bug     : 1059322 1056752

    A couple of vulnerabilities were found in zfs-linux.

    CVE-2013-20001

        In OpenZFS, when an NFS share is exported to IPv6 addresses via the         sharenfs feature, there is a silent failure to parse the IPv6         address data, and access is allowed to everyone. IPv6 restrictions         from the configuration are not applied.

    CVE-2023-49298

        OpenZFS 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.

    For Debian 10 buster, these problems have been fixed in version     0.7.12-2+deb10u3.

    We recommend that you upgrade your zfs-linux packages.

    For the detailed security status of zfs-linux please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/zfs-linux

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
233873	Debian dla-4114 : libnvpair3linux - security update	Nessus	Debian Local Security Checks	high
227083	Linux Distros Unpatched Vulnerability : CVE-2023-49298	Nessus	Misc.	high
192223	Debian dla-3766 : libnvpair1linux - security update	Nessus	Debian Local Security Checks	high

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CVE-2023-49298

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