FreeBSD : Borg (Backup) -- flaw in cryptographic authentication scheme in Borg allowed an attacker to fake archives and indirectly cause backup data loss. (b8a52e5a-483d-11ee-971d-3df00e0f9020)

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# @NOAGENT@
#
# The descriptive text and package checks in this plugin were
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2021 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
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# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include('compat.inc');

if (description)
{
  script_id(180430);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/25");

  script_cve_id("CVE-2023-36811");

  script_name(english:"FreeBSD : Borg (Backup) -- flaw in cryptographic authentication scheme in Borg allowed an attacker to fake archives and indirectly cause backup data loss. (b8a52e5a-483d-11ee-971d-3df00e0f9020)");

  script_set_attribute(attribute:"synopsis", value:
"The remote FreeBSD host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the b8a52e5a-483d-11ee-971d-3df00e0f9020 advisory.

  - borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw
    in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and
    potentially indirectly cause backup data loss in the repository. The attack requires an attacker to be
    able to: 1. insert files (with no additional headers) into backups and 2. gain write access to the
    repository. This vulnerability does not disclose plaintext to the attacker, nor does it affect the
    authenticity of existing archives. Creating plausible fake archives may be feasible for empty or small
    archives, but is unlikely for large archives. The issue has been fixed in borgbackup 1.2.5. Users are
    advised to upgrade. Additionally to installing the fixed code, users must follow the upgrade procedure as
    documented in the change log. Data loss after being attacked can be avoided by reviewing the archives
    (timestamp and contents valid and as expected) after any borg check --repair and before borg prune.
    There are no known workarounds for this vulnerability. (CVE-2023-36811)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/borgbackup/borg/blob/1.2.5-cvedocs/docs/changes.rst#pre-125-archives-spoofing-vulnerability-cve-2023-36811
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b5ed84fa");
  # https://vuxml.freebsd.org/freebsd/b8a52e5a-483d-11ee-971d-3df00e0f9020.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a98c05d6");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:S/C:N/I:C/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-36811");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/08/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py310-borgbackup");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py311-borgbackup");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py312-borgbackup");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py37-borgbackup");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py38-borgbackup");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py39-borgbackup");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"FreeBSD Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("freebsd_package.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


var flag = 0;

var packages = [
    'py310-borgbackup<1.2.5',
    'py311-borgbackup<1.2.5',
    'py312-borgbackup<1.2.5',
    'py37-borgbackup<1.2.5',
    'py38-borgbackup<1.2.5',
    'py39-borgbackup<1.2.5'
];

foreach var package( packages ) {
    if (pkg_test(save_report:TRUE, pkg: package)) flag++;
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : pkg_report_get()
  );
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");