F5 Networks BIG-IP : BIG-IP mcpd vulnerability (K32121038)

2020-04-30T00:00:00
ID F5_BIGIP_SOL32121038.NASL
Type nessus
Reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-06-22T00:00:00

Description

A race condition exists where mcpd and other processes may make unencrypted connection attempts to a new configuration sync peer. The race condition can occur when changing the ConfigSync IP address of a peer, adding a new peer, or when the Traffic Management Microkernel (TMM) first starts up. (CVE-2020-5876)

Impact

The race condition gives a small window of opportunity for an attacker to takeover the connection and spoof a trusted peer device to extract and/or modify sensitive information on the system. This vulnerability is only present when the BIG-IP system is configured as part of a ConfigSync high availability (HA) device group.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K32121038.
#
# The text description of this plugin is (C) F5 Networks.
#

include("compat.inc");

if (description)
{
  script_id(136135);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");

  script_cve_id("CVE-2020-5876");

  script_name(english:"F5 Networks BIG-IP : BIG-IP mcpd vulnerability (K32121038)");
  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:
"A race condition exists where mcpd and other processes may make
unencrypted connection attempts to a new configuration sync peer. The
race condition can occur when changing the ConfigSync IP address of a
peer, adding a new peer, or when the Traffic Management Microkernel
(TMM) first starts up. (CVE-2020-5876)

Impact

The race condition gives a small window of opportunity for an attacker
to takeover the connection and spoof a trusted peer device to extract
and/or modify sensitive information on the system. This vulnerability
is only present when the BIG-IP system is configured as part of a
ConfigSync high availability (HA) device group."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://support.f5.com/csp/article/K32121038"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade to one of the non-vulnerable versions listed in the F5
Solution K32121038."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/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:H/PR:N/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-2020-5876");
  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:"2020/04/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/30");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 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 = "K32121038";
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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["AFM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["AM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["APM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["ASM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["AVR"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["GTM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["LC"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["LTM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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","13.1.0-13.1.3","12.1.0-12.1.5","11.6.1-11.6.5");
vmatrix["PEM"]["unaffected"] = make_list("15.1.0","14.1.2.5","13.1.3.4","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");
}