AlmaLinux 8 : samba (ALSA-2023:4328)

2023-08-0300:00:00

www.tenable.com

almalinux 8

samba

smb2 packet signing

vulnerability

cve-2023-3347

man-in-the-middle attack

network traffic

data integrity

nessus scanner

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS

0.001

Percentile

35.7%

JSON

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2023:4328 advisory.

A vulnerability was found in Samba’s SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured server signing = required or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in- the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data. (CVE-2023-3347)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2023:4328.
##

include('compat.inc');

if (description)
{
  script_id(179328);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/12");

  script_cve_id("CVE-2023-3347");
  script_xref(name:"ALSA", value:"2023:4328");
  script_xref(name:"IAVA", value:"2023-A-0376-S");

  script_name(english:"AlmaLinux 8 : samba (ALSA-2023:4328)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the
ALSA-2023:4328 advisory.

  - A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not
    enforced if an admin configured server signing = required or for SMB2 connections to Domain Controllers
    where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-
    the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and
    server, affecting the integrity of the data. (CVE-2023-3347)

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://errata.almalinux.org/8/ALSA-2023-4328.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/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:N/AC:H/PR:N/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-2023-3347");

  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:"2023/07/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/07/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libnetapi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libnetapi-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libsmbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libwbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:libwbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-samba-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:python3-samba-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-client-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-common-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-dcerpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-krb5-printing");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-ldb-ldap-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-test-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-usershares");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-vfs-iouring");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:samba-winexe");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::appstream");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::baseos");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::highavailability");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::nfv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::powertools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::realtime");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::resilientstorage");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::sap_hana");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:8::supplementary");
  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:"Alma Linux 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/AlmaLinux/release", "Host/AlmaLinux/rpm-list", "Host/cpu");

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/AlmaLinux/release');
if (isnull(os_release) || 'AlmaLinux' >!< os_release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
os_ver = os_ver[1];
if (! preg(pattern:"^8([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 8.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/rpm-list')) 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, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'ctdb-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libnetapi-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libnetapi-devel-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsmbclient-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libsmbclient-devel-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwbclient-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'libwbclient-devel-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-samba-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-samba-dc-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-samba-devel-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-samba-test-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-client-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-client-libs-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-common-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-common-libs-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-common-tools-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-dc-libs-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-dcerpc-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-devel-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-krb5-printing-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-ldb-ldap-modules-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-libs-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-pidl-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-test-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-test-libs-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-tools-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-usershares-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-vfs-iouring-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-winbind-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-winbind-clients-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-winbind-krb5-locator-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-winbind-modules-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'samba-winexe-4.17.5-3.el8_8.alma', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Alma-' + package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libnetapi / libnetapi-devel / libsmbclient / etc');
}