Ubuntu 23.10 : Samba vulnerabilities (USN-6425-3)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6425-3. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(183272);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/16");

  script_cve_id(
    "CVE-2023-4091",
    "CVE-2023-4154",
    "CVE-2023-42669",
    "CVE-2023-42670"
  );
  script_xref(name:"IAVA", value:"2023-A-0535");
  script_xref(name:"USN", value:"6425-3");

  script_name(english:"Ubuntu 23.10 : Samba vulnerabilities (USN-6425-3)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
USN-6425-3 advisory.

  - The vulnerability exists due to an error in the way SMB protocol implementation in Samba handles file
    operations. A remote user can request read-only access to files and then truncate them to 0 bytes by
    opening files with OVERWRITE disposition when using the acl_xattr Samba VFS module with the smb.conf
    setting acl_xattr:ignore system acls = yes. (CVE-2023-4091)

  - The vulnerability exists due to a design error in Samba's implementation of the DirSync control, which can
    allow replication of critical domain passwords and secrets by Active Directory accounts authorized to do
    some replication, but not to replicate sensitive attributes. A remote user can obtain sensitive
    information from the AD DC and compromise the Active Directory. (CVE-2023-4154)

  - The vulnerability exists due to inclusion of the rpcecho server into production build, which can call
    sleep() on AD DC. A remote user can request the server block using the rpcecho server and perform a
    denial of service (DoS) attack. (CVE-2023-42669)

  - The vulnerability exists due to improper management of internal resources within the application when
    Samba RPC server is under load, which can lead to incorrect start of servers not built for the AD DC. A
    remote user can cause a high load to Samba RPC server and perform a denial of service (DoS) attack.
    (CVE-2023-42670)

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://ubuntu.com/security/notices/USN-6425-3");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:N/A:N");
  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:H/I:N/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-2023-4154");

  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:"2023/10/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ldb-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libldb-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libldb2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-ldb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-ldb-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:registry-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-ad-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-ad-provision");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:winbind");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2023 Canonical, Inc. / NASL script (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('23.10' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 23.10', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var pkgs = [
    {'osver': '23.10', 'pkgname': 'ctdb', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'ldb-tools', 'pkgver': '2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libldb-dev', 'pkgver': '2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libldb2', 'pkgver': '2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libsmbclient', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'libwbclient0', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'python3-ldb', 'pkgver': '2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'python3-ldb-dev', 'pkgver': '2:2.7.2+samba4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'python3-samba', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'registry-tools', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-ad-dc', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-ad-provision', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-common', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-dev', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-libs', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'smbclient', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'},
    {'osver': '23.10', 'pkgname': 'winbind', 'pkgver': '2:4.18.6+dfsg-1ubuntu2.1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / ldb-tools / libldb-dev / libldb2 / libnss-winbind / etc');
}