Debian DLA-3563-1 : samba - LTS security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-3563. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(181444);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/14");

  script_cve_id(
    "CVE-2016-2124",
    "CVE-2019-10218",
    "CVE-2019-14833",
    "CVE-2019-14847",
    "CVE-2019-14902",
    "CVE-2019-14907",
    "CVE-2019-19344"
  );
  script_xref(name:"IAVA", value:"2019-A-0407-S");
  script_xref(name:"IAVA", value:"2020-A-0035-S");

  script_name(english:"Debian DLA-3563-1 : samba - LTS 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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-3563 advisory.

  - A flaw was found in the way samba implemented SMB1 authentication. An attacker could use this flaw to
    retrieve the plaintext password sent over the wire even if Kerberos authentication was required.
    (CVE-2016-2124)

  - A flaw was found in the samba client, all samba versions before samba 4.11.2, 4.10.10 and 4.9.15, where a
    malicious server can supply a pathname to the client with separators. This could allow the client to
    access files and folders outside of the SMB network pathnames. An attacker could use this vulnerability to
    create files outside of the current working directory using the privileges of the client user.
    (CVE-2019-10218)

  - A flaw was found in Samba, all versions starting samba 4.5.0 before samba 4.9.15, samba 4.10.10, samba
    4.11.2, in the way it handles a user password change or a new password for a samba user. The Samba Active
    Directory Domain Controller can be configured to use a custom script to check for password complexity.
    This configuration can fail to verify password complexity when non-ASCII characters are used in the
    password, which could lead to weak passwords being set for samba users, making it vulnerable to dictionary
    attacks. (CVE-2019-14833)

  - A flaw was found in samba 4.0.0 before samba 4.9.15 and samba 4.10.x before 4.10.10. An attacker can crash
    AD DC LDAP server via dirsync resulting in denial of service. Privilege escalation is not possible with
    this issue. (CVE-2019-14847)

  - There is an issue in all samba 4.11.x versions before 4.11.5, all samba 4.10.x versions before 4.10.12 and
    all samba 4.9.x versions before 4.9.18, where the removal of the right to create or modify a subtree would
    not automatically be taken away on all domain controllers. (CVE-2019-14902)

  - All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where
    if it is set with log level = 3 (or above) then the string obtained from the client, after a failed
    character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange.
    In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to
    terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a
    crash there is harmless). (CVE-2019-14907)

  - There is a use-after-free issue in all samba 4.9.x versions before 4.9.18, all samba 4.10.x versions
    before 4.10.12 and all samba 4.11.x versions before 4.11.5, essentially due to a call to realloc() while
    other local variables still point at the original buffer. (CVE-2019-19344)

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/samba");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2023/dla-3563");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2016-2124");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-10218");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-14833");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-14847");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-14902");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-14907");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2019-19344");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/samba");
  script_set_attribute(attribute:"solution", value:
"Upgrade the samba packages.

For Debian 10 buster, these problems have been fixed in version 2");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14902");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-10218");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/09/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:registry-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:winbind");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  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:"Debian 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/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:"^(10)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 10.0', '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': '10.0', 'prefix': 'ctdb', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libnss-winbind', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libpam-winbind', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libsmbclient', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libsmbclient-dev', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libwbclient-dev', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'libwbclient0', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'python-samba', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'registry-tools', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-common', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-common-bin', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-dev', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-dsdb-modules', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-libs', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-testsuite', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'samba-vfs-modules', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'smbclient', 'reference': '2:4.9.5+dfsg-5+deb10u4'},
    {'release': '10.0', 'prefix': 'winbind', 'reference': '2:4.9.5+dfsg-5+deb10u4'}
];

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_WARNING,
    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, 'ctdb / libnss-winbind / libpam-winbind / libsmbclient / etc');
}