Ubuntu 20.04 LTS : Samba regression (USN-6425-2)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6425-2. 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(182944);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");
  script_xref(name:"USN", value:"6425-2");

  script_name(english:"Ubuntu 20.04 LTS : Samba regression (USN-6425-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the
USN-6425-2 advisory.

    USN-6425-1 fixed vulnerabilities in Samba. Due to a build issue on Ubuntu 20.04 LTS, the update introduced
    regressions in macro handling and possibly other functionality.

    This update fixes the problem. We apologize for the inconvenience.

    Original advisory details:

    Sri Nagasubramanian discovered that the Samba acl_xattr VFS module

    incorrectly handled read-only files. When Samba is configured to ignore

    system ACLs, a remote attacker could possibly use this issue to truncate

    read-only files. (CVE-2023-4091)

    Andrew Bartlett discovered that Samba incorrectly handled the DirSync

    control. A remote attacker with an RODC DC account could possibly use this

    issue to obtain all domain secrets. (CVE-2023-4154)

    Andrew Bartlett discovered that Samba incorrectly handled the rpcecho

    development server. A remote attacker could possibly use this issue to

    cause Samba to stop responding, resulting in a denial of service.

    (CVE-2023-42669)

    Kirin van der Veer discovered that Samba incorrectly handled certain RPC

    service listeners. A remote attacker could possibly use this issue to cause

    Samba to start multiple incompatible RPC listeners, resulting in a denial

    of service. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 23.04.

    (CVE-2023-42670)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

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://ubuntu.com/security/notices/USN-6425-2");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_attribute(attribute:"risk_factor", value:"None");

  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:"2023/10/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/11");

  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:"p-cpe:/a:canonical:ubuntu_linux:ctdb");
  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-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-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_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2023-2024 Canonical, Inc. / NASL script (C) 2023-2024 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)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04', '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-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libnss-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'python3-samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-common', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'smbclient', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'},
    {'osver': '20.04', 'pkgname': 'winbind', 'pkgver': '2:4.15.13+dfsg-0ubuntu0.20.04.7'}
];

var flag = 0;
foreach var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libnss-winbind / libpam-winbind / libsmbclient / etc');
}