Debian dsa-6469 : xrdp - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-6469. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(341057);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/27");

  script_cve_id(
    "CVE-2026-32105",
    "CVE-2026-32107",
    "CVE-2026-32623",
    "CVE-2026-32624",
    "CVE-2026-33145",
    "CVE-2026-33516",
    "CVE-2026-33689",
    "CVE-2026-35512",
    "CVE-2026-41252",
    "CVE-2026-41521",
    "CVE-2026-42218",
    "CVE-2026-44178",
    "CVE-2026-44978",
    "CVE-2026-54538",
    "CVE-2026-55238",
    "CVE-2026-55639",
    "CVE-2026-55645"
  );

  script_name(english:"Debian dsa-6469 : xrdp - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the
dsa-6469 advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6469-1                   [email protected]
    https://www.debian.org/security/                                  Aron Xu
    August 27, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xrdp
    CVE ID         : CVE-2026-32105 CVE-2026-32107 CVE-2026-32623 CVE-2026-32624
                     CVE-2026-33145 CVE-2026-33516 CVE-2026-33689 CVE-2026-35512
                     CVE-2026-41252 CVE-2026-41521 CVE-2026-42218 CVE-2026-44178
                     CVE-2026-44978 CVE-2026-54538 CVE-2026-55238 CVE-2026-55639
                     CVE-2026-55645
    Debian Bug     : 1134339

    Multiple vulnerabilities were discovered in xrdp, a Remote Desktop
    Protocol (RDP) server, which may result in denial of service,
    information disclosure, privilege escalation or the execution of
    arbitrary code. Several of these issues are exploitable by an
    unauthenticated remote attacker.

    This update also changes two defaults, as part of the fixes:

     * Alternate shells supplied by the client are now rejected unless
       AllowAlternateShell is explicitly enabled in /etc/xrdp/sesman.ini.
       This is the fix for CVE-2026-33145 and applies even on systems with
       a locally modified sesman.ini.

     * The generic VNC proxy session type [vnc-any] is now commented out in
       /etc/xrdp/xrdp.ini. It was reachable before authentication and
       exposed CVE-2026-41252 and CVE-2026-41521 to unauthenticated
       clients. Administrators who need it should re-enable it and restrict
       it to specific hosts and ports.

    For the stable distribution (trixie), these problems have been fixed in
    version 0.10.1-3.1+deb13u2.

    We recommend that you upgrade your xrdp packages.

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

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

    Mailing list: [email protected]

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.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/xrdp");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32105");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32107");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32623");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-32624");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33145");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33516");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-33689");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-35512");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-41252");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-41521");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-42218");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44178");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-44978");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-54538");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55238");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55639");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-55645");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/xrdp");
  script_set_attribute(attribute:"solution", value:
"Upgrade the xrdp packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:C");
  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:N/UI:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:H/SI:H/SA:L");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-41521");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-32105");

  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:"2026/04/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:xrdp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 13.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '13.0', 'prefix': 'xrdp', 'reference': '0.10.1-3.1+deb13u2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'xrdp');
}