Vulnerabilities > CVE-2019-6684 - Unspecified vulnerability in F5 products

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
f5
nessus
NVD
Published: 2019-12-23
Updated: 2020-08-24

Summary

On versions 15.0.0-15.0.1.1, 14.0.0-14.1.2.2, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.2-11.6.5.1, under certain conditions, a multi-bladed BIG-IP Virtual Clustered Multiprocessing (vCMP) may drop broadcast packets when they are rebroadcast to the vCMP guest secondary blades. An attacker can leverage the fragmented broadcast IP packets to perform any type of fragmentation-based attack.

Vulnerable Configurations

Part Description Count
Application
F5
1406

Nessus

NASL familyF5 Networks Local Security Checks
NASL idF5_BIGIP_SOL95117754.NASL
descriptionUnder certain conditions, a multi-bladed BIG-IP Virtual Clustered Multiprocessing (vCMP) may drop broadcast packets when they are rebroadcast to the vCMP guest secondary blades. An attacker can leverage the fragmented broadcast IP packets to perform any type of fragmentation-based attack. (CVE-2019-6684) Impact A remote attacker may cause the Traffic Management Microkernel (TMM) to restart using maliciously constructed broadcast IP fragments.This issue occurs on multi-blade chassis, including multi-blade vCMP guests. This issue does not occur on single-bladed systems, on BIG-IP Virtual Edition (VE), or on single-bladed vCMP guests.
last seen2020-03-30
modified2019-12-31
plugin id132582
published2019-12-31
reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/132582
titleF5 Networks BIG-IP : TMM vulnerability (K95117754)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K95117754.
#
# The text description of this plugin is (C) F5 Networks.
#

include("compat.inc");

if (description)
{
  script_id(132582);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");

  script_cve_id("CVE-2019-6684");

  script_name(english:"F5 Networks BIG-IP : TMM vulnerability (K95117754)");
  script_summary(english:"Checks the BIG-IP version.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote device is missing a vendor-supplied security patch."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Under certain conditions, a multi-bladed BIG-IP Virtual Clustered
Multiprocessing (vCMP) may drop broadcast packets when they are
rebroadcast to the vCMP guest secondary blades. An attacker can
leverage the fragmented broadcast IP packets to perform any type of
fragmentation-based attack. (CVE-2019-6684)

Impact

A remote attacker may cause the Traffic Management Microkernel (TMM)
to restart using maliciously constructed broadcast IP fragments.This
issue occurs on multi-blade chassis, including multi-blade vCMP
guests. This issue does not occur on single-bladed systems, on BIG-IP
Virtual Edition (VE), or on single-bladed vCMP guests."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://support.f5.com/csp/article/K95117754"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade to one of the non-vulnerable versions listed in the F5
Solution K95117754."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  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_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:/h:f5:big-ip");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/31");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"F5 Networks Local Security Checks");

  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");

  exit(0);
}


include("f5_func.inc");

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

sol = "K95117754";
vmatrix = make_array();

# AFM
vmatrix["AFM"] = make_array();
vmatrix["AFM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["AFM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# AM
vmatrix["AM"] = make_array();
vmatrix["AM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["AM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# APM
vmatrix["APM"] = make_array();
vmatrix["APM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["APM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# ASM
vmatrix["ASM"] = make_array();
vmatrix["ASM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["ASM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# AVR
vmatrix["AVR"] = make_array();
vmatrix["AVR"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["AVR"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# GTM
vmatrix["GTM"] = make_array();
vmatrix["GTM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["GTM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# LC
vmatrix["LC"] = make_array();
vmatrix["LC"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["LC"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# LTM
vmatrix["LTM"] = make_array();
vmatrix["LTM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["LTM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");

# PEM
vmatrix["PEM"] = make_array();
vmatrix["PEM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["PEM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","13.1.3.2","12.1.5.1","11.6.5.2");


if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
  if (report_verbosity > 0) security_warning(port:0, extra:bigip_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = bigip_get_tested_modules();
  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");
}

References