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nessusThis script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.F5_BIGIP_SOL07721343.NASL
HistoryNov 02, 2023 - 12:00 a.m.

F5 Networks BIG-IP : Linux kernel vulnerability (K07721343)

2023-11-0200:00:00
This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
6
f5 networks big-ip
linux kernel
vulnerability
k07721343
kvm virtualization
privilege escalation
cve-2018-10901
nessus scanner

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.7

Confidence

High

EPSS

0.001

Percentile

26.7%

The version of F5 Networks BIG-IP installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the K07721343 advisory.

  • A flaw was found in Linux kernelโ€™s KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a hostโ€™s userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges. (CVE-2018-10901)

Note that Nessus has not tested for this issue but has instead relied only on the applicationโ€™s self-reported version number.

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K07721343.
#
# @NOAGENT@
##

include('compat.inc');

if (description)
{
  script_id(184229);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/07");

  script_cve_id("CVE-2018-10901");

  script_name(english:"F5 Networks BIG-IP : Linux kernel vulnerability (K07721343)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"The version of F5 Networks BIG-IP installed on the remote host is prior to tested version. It is, therefore, affected by
a vulnerability as referenced in the K07721343 advisory.

  - A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the
    GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's
    userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu
    variables. An attacker can use this to escalate their privileges. (CVE-2018-10901)

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://my.f5.com/manage/s/article/K07721343");
  script_set_attribute(attribute:"solution", value:
"The vendor has acknowledged the vulnerability, but no solution has been provided.
Refer to the vendor for remediation guidance.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  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:H/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-2018-10901");

  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:"2018/04/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/11/02");

  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) 2023-2024 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 = 'K07721343';
var vmatrix = {
  'AFM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'AM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'APM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'ASM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'AVR': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'DNS': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'GTM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'LC': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'LTM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'PEM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  },
  'WAM': {
    'affected': [
      '12.1.0-12.1.4','11.5.1-11.6.3'
    ],
  }
};

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_HOLE,
      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');
}
VendorProductVersionCPE
f5big-ip_link_controllercpe:/a:f5:big-ip_link_controller
f5big-ip_application_visibility_and_reportingcpe:/a:f5:big-ip_application_visibility_and_reporting
f5big-ip_domain_name_systemcpe:/a:f5:big-ip_domain_name_system
f5big-ip_policy_enforcement_managercpe:/a:f5:big-ip_policy_enforcement_manager
f5big-ipcpe:/h:f5:big-ip
f5big-ip_application_security_managercpe:/a:f5:big-ip_application_security_manager
f5big-ip_advanced_firewall_managercpe:/a:f5:big-ip_advanced_firewall_manager
f5big-ip_local_traffic_managercpe:/a:f5:big-ip_local_traffic_manager
f5big-ip_access_policy_managercpe:/a:f5:big-ip_access_policy_manager
f5big-ip_global_traffic_managercpe:/a:f5:big-ip_global_traffic_manager
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CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.7

Confidence

High

EPSS

0.001

Percentile

26.7%