F5 Networks BIG-IP : TMOS Shell vulnerability (K21711352)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K21711352.
#
# The text description of this plugin is (C) F5 Networks.
#

include('compat.inc');

if (description)
{
  script_id(136208);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/03");

  script_cve_id("CVE-2019-19151");

  script_name(english:"F5 Networks BIG-IP : TMOS Shell vulnerability (K21711352)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"Authenticated users granted TMOS Shell ( tmsh ) privileges can access
objects on the file system, which would normally be disallowed by tmsh
restrictions. This allows for authenticated, low privileged attackers
to access objects on the file system, which would not normally be
allowed. (CVE-2019-19151)

Note : This vulnerability exists because of an incomplete fix for
CVE-2018-5516.

Impact

This vulnerability allows unauthorized privileges to authenticated
administrative users with TMOS Shell ( tmsh) access.");
  script_set_attribute(attribute:"see_also", value:"https://my.f5.com/manage/s/article/K21711352");
  script_set_attribute(attribute:"solution", value:
"Upgrade to one of the non-vulnerable versions listed in the F5 Solution K21711352.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-19151");

  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:"2018/05/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/01");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_access_policy_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_advanced_firewall_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_acceleration_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_security_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_visibility_and_reporting");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_domain_name_system");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_global_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_link_controller");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_local_traffic_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_policy_enforcement_manager");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_webaccelerator");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"F5 Networks Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("f5_bigip_detect.nbin");
  script_require_keys("Host/local_checks_enabled", "Host/BIG-IP/hotfix", "Host/BIG-IP/modules", "Host/BIG-IP/version", "Settings/ParanoidReport");

  exit(0);
}


include('f5_func.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var version = get_kb_item('Host/BIG-IP/version');
if ( ! version ) audit(AUDIT_OS_NOT, 'F5 Networks BIG-IP');
if ( isnull(get_kb_item('Host/BIG-IP/hotfix')) ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/hotfix');
if ( ! get_kb_item('Host/BIG-IP/modules') ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/modules');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

var sol = 'K21711352';
var vmatrix = {
  'AFM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'AM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'APM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'ASM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'AVR': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'DNS': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'GTM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'LC': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'LTM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'PEM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  },
  'WAM': {
    'affected': [
      '15.1.0','15.0.0','14.0.0-14.1.2','13.0.0-13.1.3','12.1.0-12.1.5','11.5.1-11.6.5'
    ],
    'unaffected': [
      '16.0.0','15.1.0.5','15.0.1.4','14.1.2.5','13.1.3.4','12.1.5.2'
    ],
  }
};

if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
  var extra = NULL;
  if (report_verbosity > 0) extra = bigip_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : extra
  );
}
else
{
  var tested = bigip_get_tested_modules();
  var audit_extra = 'For BIG-IP module(s) ' + tested + ',';
  if (tested) audit(AUDIT_INST_VER_NOT_VULN, audit_extra, version);
  else audit(AUDIT_HOST_NOT, 'running any of the affected modules');
}