Vulnerabilities > CVE-2019-6685 - Improper Privilege Management vulnerability in F5 products

047910
CVSS 4.6 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
local
low complexity
f5
CWE-269
nessus
NVD
Published: 2019-12-23
Updated: 2019-12-30

Summary

On BIG-IP versions 15.0.0-15.0.1.1, 14.1.0-14.1.2.2, 14.0.0-14.0.1, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.2-11.6.5.1, users with access to edit iRules are able to create iRules which can lead to an elevation of privilege, configuration modification, and arbitrary system command execution.

Vulnerable Configurations

Part Description Count
Application
F5
1365

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.

Nessus

NASL familyF5 Networks Local Security Checks
NASL idF5_BIGIP_SOL30215839.NASL
descriptionUsers with access to edit iRules are able to create iRules which can lead to an elevation of privilege, configuration modification, and arbitrary system command execution. (CVE-2019-6685) Impact BIG-IP iRules manager roles are able to access data stored on other administrative partitions when the accessprivilege iselevated. BIG-IQ,Enterprise Manager, and Traffix SDC There is no impact on these F5 products because theyare not affected by this vulnerability.
last seen2020-03-30
modified2019-12-31
plugin id132563
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/132563
titleF5 Networks BIG-IP : F5 iRules vulnerability (K30215839)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K30215839.
#
# The text description of this plugin is (C) F5 Networks.
#

include("compat.inc");

if (description)
{
  script_id(132563);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/22");

  script_cve_id("CVE-2019-6685");

  script_name(english:"F5 Networks BIG-IP : F5 iRules vulnerability (K30215839)");
  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:
"Users with access to edit iRules are able to create iRules which can
lead to an elevation of privilege, configuration modification, and
arbitrary system command execution. (CVE-2019-6685)

Impact

BIG-IP

iRules manager roles are able to access data stored on other
administrative partitions when the accessprivilege iselevated.

BIG-IQ,Enterprise Manager, and Traffix SDC

There is no impact on these F5 products because theyare not affected
by this vulnerability."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://support.f5.com/csp/article/K30215839"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade to one of the non-vulnerable versions listed in the F5
Solution K30215839."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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: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:"exploitability_ease", value:"No known exploits are available");

  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_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:"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", "Settings/ParanoidReport");

  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 = "K30215839";
vmatrix = make_array();

if (report_paranoia < 2) audit(AUDIT_PARANOID);

# AFM
vmatrix["AFM"] = make_array();
vmatrix["AFM"]["affected"  ] = make_list("15.0.0-15.0.1","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","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","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","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","14.0.1.1","13.1.3.2","12.1.5.1","11.6.5.2");

# WAM
vmatrix["WAM"] = make_array();
vmatrix["WAM"]["affected"  ] = make_list("15.0.0-15.0.1","14.1.0-14.1.2","14.0.0-14.0.1","13.1.0-13.1.3","12.1.0-12.1.5","11.5.2-11.6.5");
vmatrix["WAM"]["unaffected"] = make_list("15.1.0","15.0.1.3","14.1.2.3","14.0.1.1","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