Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Samba vulnerabilities (USN-6238-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6238-1. 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(178487);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/23");

  script_cve_id(
    "CVE-2022-2127",
    "CVE-2023-3347",
    "CVE-2023-34966",
    "CVE-2023-34967",
    "CVE-2023-34968"
  );
  script_xref(name:"USN", value:"6238-1");
  script_xref(name:"IAVA", value:"2023-A-0376-S");

  script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : Samba vulnerabilities (USN-6238-1)");

  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 20.04 LTS / 22.04 LTS / 22.10 / 23.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6238-1 advisory.

  - A path disclosure vulnerability was found in Samba. As part of the Spotlight protocol, Samba discloses the
    server-side absolute path of shares, files, and directories in the results for search queries. This flaw
    allows a malicious client or an attacker with a targeted RPC request to view the information that is part
    of the disclosed path. (CVE-2023-34968)

  - An out-of-bounds read vulnerability was found in Samba due to insufficient length checks in
    winbindd_pam_auth_crap.c. When performing NTLM authentication, the client replies to cryptographic
    challenges back to the server. These replies have variable lengths, and Winbind fails to check the lan
    manager response length. When Winbind is used for NTLM authentication, a maliciously crafted request can
    trigger an out-of-bounds read in Winbind, possibly resulting in a crash. (CVE-2022-2127)

  - 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)

  - An infinite loop vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing
    Spotlight mdssvc RPC packets sent by the client, the core unmarshalling function sl_unpack_loop() did not
    validate a field in the network packet that contains the count of elements in an array-like structure. By
    passing 0 as the count value, the attacked function will run in an endless loop consuming 100% CPU. This
    flaw allows an attacker to issue a malformed RPC request, triggering an infinite loop, resulting in a
    denial of service condition. (CVE-2023-34966)

  - A Type Confusion vulnerability was found in Samba's mdssvc RPC service for Spotlight. When parsing
    Spotlight mdssvc RPC packets, one encoded data structure is a key-value style dictionary where the keys
    are character strings, and the values can be any of the supported types in the mdssvc protocol. Due to a
    lack of type checking in callers of the dalloc_value_for_key() function, which returns the object
    associated with a key, a caller may trigger a crash in talloc_get_size() when talloc detects that the
    passed-in pointer is not a valid talloc pointer. With an RPC worker process shared among multiple client
    connections, a malicious client or attacker can trigger a process crash in a shared RPC mdssvc worker
    process, affecting all other clients this worker serves. (CVE-2023-34967)

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-6238-1");
  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:"2023/07/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/07/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.04");
  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 (! ('20.04' >< os_release || '22.04' >< os_release || '23.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.04', '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': '20.04', 'pkgname': 'ctdb', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'python3-samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-common', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'smbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '20.04', 'pkgname': 'winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.3'},
    {'osver': '22.04', 'pkgname': 'ctdb', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'python3-samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-common', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'smbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '22.04', 'pkgname': 'winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu1.2'},
    {'osver': '23.04', 'pkgname': 'ctdb', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'ldb-tools', 'pkgver': '2:2.6.2+samba4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libldb-dev', 'pkgver': '2:2.6.2+samba4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libldb2', 'pkgver': '2:2.6.2+samba4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'python3-ldb', 'pkgver': '2:2.6.2+samba4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'python3-ldb-dev', 'pkgver': '2:2.6.2+samba4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'python3-samba', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-ad-dc', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-ad-provision', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-common', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'smbclient', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'},
    {'osver': '23.04', 'pkgname': 'winbind', 'pkgver': '2:4.17.7+dfsg-1ubuntu1.1'}
];

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');
}