EulerOS Virtualization 2.9.0 : samba (EulerOS-SA-2021-1635)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(147666);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/10");

  script_cve_id(
    "CVE-2020-14318",
    "CVE-2020-14323",
    "CVE-2020-14383",
    "CVE-2020-1472"
  );
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2020/09/21");
  script_xref(name:"CISA-NCAS", value:"AA22-011A");
  script_xref(name:"CEA-ID", value:"CEA-2020-0129");
  script_xref(name:"CEA-ID", value:"CEA-2020-0101");
  script_xref(name:"CEA-ID", value:"CEA-2021-0025");
  script_xref(name:"CEA-ID", value:"CEA-2021-0008");
  script_xref(name:"CEA-ID", value:"CEA-2020-0121");
  script_xref(name:"CEA-ID", value:"CEA-2023-0016");

  script_name(english:"EulerOS Virtualization 2.9.0 : samba (EulerOS-SA-2021-1635)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security
updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the samba packages installed, the
EulerOS Virtualization installation on the remote host is affected by
the following vulnerabilities :

  - A flaw was found in samba's DNS server. An
    authenticated user could use this flaw to the RPC
    server to crash. This RPC server, which also serves
    protocols other than dnsserver, will be restarted after
    a short delay, but it is easy for an authenticated non
    administrative attacker to crash it again as soon as it
    returns. The Samba DNS server itself will continue to
    operate, but many RPC services will
    not.(CVE-2020-14383)

  - As Samba internally opens an underlying file system
    handle on a directory when a client requests an open,
    even for FILE_READ_ATTRIBUTES then if the underlying
    file system permissions don&#39t allow &quotr&quot
    (read) access for the connected user, then the handle
    open request will be denied.&quot(CVE-2020-14318)

  - A null pointer dereference flaw was found in samba's
    Winbind service in versions before 4.11.15, before
    4.12.9 and before 4.13.1. A local user could use this
    flaw to crash the winbind service causing denial of
    service.(CVE-2020-14323)

  - An elevation of privilege vulnerability exists when an
    attacker establishes a vulnerable Netlogon secure
    channel connection to a domain controller, using the
    Netlogon Remote Protocol (MS-NRPC), aka 'Netlogon
    Elevation of Privilege Vulnerability'.(CVE-2020-1472)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2021-1635
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?586e5458");
  script_set_attribute(attribute:"solution", value:
"Update the affected samba packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-1472");

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

  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libwbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.9.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "2.9.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.9.0");
if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["libsmbclient-4.11.6-6.h11.eulerosv2r9",
        "libwbclient-4.11.6-6.h11.eulerosv2r9",
        "samba-4.11.6-6.h11.eulerosv2r9",
        "samba-client-4.11.6-6.h11.eulerosv2r9",
        "samba-common-4.11.6-6.h11.eulerosv2r9",
        "samba-common-tools-4.11.6-6.h11.eulerosv2r9",
        "samba-libs-4.11.6-6.h11.eulerosv2r9",
        "samba-winbind-4.11.6-6.h11.eulerosv2r9",
        "samba-winbind-clients-4.11.6-6.h11.eulerosv2r9",
        "samba-winbind-modules-4.11.6-6.h11.eulerosv2r9"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "samba");
}