FreeBSD : py-matrix-synapse -- unbounded recursion in urlpreview (07c0d782-f758-11ec-acaa-901b0e9408dc)

#
# (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
#    distribution.
#
# 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
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# 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(162586);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/03/23");

  script_cve_id("CVE-2022-31052");

  script_name(english:"FreeBSD : py-matrix-synapse -- unbounded recursion in urlpreview (07c0d782-f758-11ec-acaa-901b0e9408dc)");

  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 07c0d782-f758-11ec-acaa-901b0e9408dc advisory.

  - Synapse is an open source home server implementation for the Matrix chat network. In versions prior to
    1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to
    unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the
    problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this
    maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local
    user's client may automatically request a URL preview for. Remote users are not able to exploit this
    directly, because the URL preview endpoint is authenticated. Deployments with `url_preview_enabled: false`
    set in configuration are not affected. Deployments with `url_preview_enabled: true` set in configuration
    **are** affected. Deployments with no configuration value set for `url_preview_enabled` are not affected,
    because the default is `false`. Administrators of homeservers with URL previews enabled are advised to
    upgrade to v1.61.1 or higher. Users unable to upgrade should set `url_preview_enabled` to false.
    (CVE-2022-31052)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://matrix.org/blog/2022/06/28/security-release-synapse-1-61-1");
  # https://vuxml.freebsd.org/freebsd/07c0d782-f758-11ec-acaa-901b0e9408dc.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?cd4340a7");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-31052");

  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:"2022/06/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/06/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/06/29");

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

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

  script_copyright(english:"This script is Copyright (C) 2022-2023 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-matrix-synapse<1.61.1',
    'py311-matrix-synapse<1.61.1',
    'py37-matrix-synapse<1.61.1',
    'py38-matrix-synapse<1.61.1',
    'py39-matrix-synapse<1.61.1'
];

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");