F5 Networks BIG-IP : Linux kernel vulnerability (K40523020)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K40523020.
#
# The text description of this plugin is (C) F5 Networks.
#

include('compat.inc');

if (description)
{
  script_id(147500);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/02");

  script_cve_id("CVE-2018-16658");

  script_name(english:"F5 Networks BIG-IP : Linux kernel vulnerability (K40523020)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"An issue was discovered in the Linux kernel before 4.18.6. An
information leak in cdrom_ioctl_drive_status in drivers/cdrom/cdrom.c
could be used by local attackers to read kernel memory because a cast
from unsigned long to int interferes with bounds checking. This is
similar to CVE-2018-10940. (CVE-2018-16658)

Impact

A local user with Advanced Shell ( bash ) access on a BIG-IP system,
or with local administrator access on a Traffix system, may be able to
use this flaw to gain elevated privileges. In supported configurations
on the BIG-IP system, bash access is limited to system administrators.
BIG-IP appliance mode does not expose this issue, as users are not
allowed bash access in this mode. On Traffix systems, only
administrators have local access.");
  script_set_attribute(attribute:"see_also", value:"https://my.f5.com/manage/s/article/K40523020");
  script_set_attribute(attribute:"solution", value:
"Upgrade to one of the non-vulnerable versions listed in the F5 Solution K40523020.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:P");
  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:L/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-16658");

  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:"2018/05/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/01/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/10");

  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) 2021-2023 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 = 'K40523020';
var vmatrix = {
  'AFM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'AM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'APM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'ASM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'AVR': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'DNS': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'GTM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'LC': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'LTM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'PEM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  },
  'WAM': {
    'affected': [
      '15.0.0-15.1.2','14.0.0-14.1.4','13.0.0-13.1.3'
    ],
    'unaffected': [
      '16.0.0'
    ],
  }
};

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');
}