The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3975 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3975-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                   Bastien Roucaris     November 29, 2024                             https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : proftpd-dfsg     Version        : 1.3.7a+dfsg-12+deb11u3     CVE ID         : CVE-2023-48795 CVE-2023-51713 CVE-2024-48651     Debian Bug     : 1082326

    ProFTPD a popular FTP server was affected by multiple     vulnerabilities.

    CVE-2023-48795

        The SSH transport protocol and variant like SFTP protocol used by         ProFTPD allowed remote attackers to bypass integrity checks         such that some packets are omitted (from the extension negotiation message),         and a client and server may consequently end up with a connection         for which some security features have been downgraded or disabled,         aka a Terrapin attack.

    CVE-2023-51713

        make_ftp_cmd function has a one-byte out-of-bounds read,         because of mishandling of quote/backslash semantics.

    CVE-2024-48651

        In proftpd with mod_sftp and mod_sql, an user with         no supplemental groups will incorrectly inherit supplemental         groups from the parent process. Thhis behavior resulted in users gaining supplemental         membership in nogroup, or depending of version root group (GID=0).

    For Debian 11 bullseye, these problems have been fixed in version     1.3.7a+dfsg-12+deb11u3.

    We recommend that you upgrade your proftpd-dfsg packages.

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

    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.

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Debian dla-3975 : proftpd-basic - security update

critical Nessus Plugin ID 211971

Version 1.1