VMware vCenter Server < 6.5 U3q Multiple Vulnerabilities (VMSA-2021-0020)

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

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

if (description)
{
  script_id(153547);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/06/30");

  script_cve_id(
    "CVE-2021-21991",
    "CVE-2021-21992",
    "CVE-2021-21993",
    "CVE-2021-22008",
    "CVE-2021-22009",
    "CVE-2021-22011",
    "CVE-2021-22012",
    "CVE-2021-22013",
    "CVE-2021-22014",
    "CVE-2021-22015",
    "CVE-2021-22017",
    "CVE-2021-22019"
  );
  script_xref(name:"IAVA", value:"2021-A-0434-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/01/24");

  script_name(english:"VMware vCenter Server < 6.5 U3q Multiple Vulnerabilities (VMSA-2021-0020)");

  script_set_attribute(attribute:"synopsis", value:
"A virtualization management application installed on the remote host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of VMware vCenter Server installed on the remote host is 6.5 prior to 6.5 U3q. It is, therefore, affected
 by multiple vulnerabilities:

    - A privilege escalation vulnerability exists in vCenter Server due to the way it handles session tokens. 
      An authenticated, local attacker can exploit this to gain unauthorized access to the system. 
      (CVE-2021-21991, CVE-2021-22015)

    - An rhttproxy bypass vulnerability exists in vCenter Server due to improper implementation of URI
      normalization. An unauthenticated, remote attacker can exploit this to gain access to internal
      endpoints. (CVE-2021-22017)


Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   
number. Nessus has also not tested for the presence of a workaround.");
  script_set_attribute(attribute:"see_also", value:"https://www.vmware.com/security/advisories/VMSA-2021-0020.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to VMware vCenter Server 6.5 U3q or later or apply the workaround mentioned in the advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-22014");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-22015");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'VMware vCenter vScalation Priv Esc');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/22");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:vmware:vcenter_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("vmware_vcenter_detect.nbin");
  script_require_keys("Host/VMware/vCenter", "Host/VMware/version", "Host/VMware/release");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

var fixes = make_array(
  '6.5', '18499837' # 6.5 U3q
);

var port = get_kb_item_or_exit('Host/VMware/vCenter');
var version = get_kb_item_or_exit('Host/VMware/version');
var release = get_kb_item_or_exit('Host/VMware/release');

# Extract and verify the build number
var build = ereg_replace(pattern:"^VMware vCenter Server [0-9\\.]+ build-([0-9]+)$", string:release, replace:"\1");
if (build !~ "^[0-9]+$") audit(AUDIT_UNKNOWN_BUILD, 'VMware vCenter 6.5 / 6.7 / 7.0');

var match = pregmatch(pattern:"^VMware vCenter ([0-9]+\.[0-9]+).*$", string:version);
if (isnull(match)) audit(AUDIT_OS_NOT, 'VMware vCenter 6.5');

var ver = match[1];
if (ver !~ "^6\.5$") audit(AUDIT_OS_NOT, 'VMware vCenter 6.5');

var fixed_build = int(fixes[ver]);
if (empty_or_null(fixed_build)) audit(AUDIT_VER_FORMAT, ver);

release = release - 'VMware vCenter Server ';
if (build >= fixed_build)
  audit(AUDIT_LISTEN_NOT_VULN, 'VMware vCenter', port, release);

var report = '\n  VMware vCenter version    : ' + ver +
             '\n  Installed build           : ' + build +
             '\n  Fixed build               : ' + fixed_build +
             '\n';

security_report_v4(port:port, severity:SECURITY_HOLE, extra:report);