Vulnerabilities > CVE-2019-6617 - Improper Privilege Management vulnerability in F5 products

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
HIGH
Confidentiality impact
NONE
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
f5
CWE-269
nessus
NVD
Published: 2019-05-03
Updated: 2023-02-16

Summary

On BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, 12.1.0-12.1.4, 11.6.1-11.6.3.4, and 11.5.2-11.5.8, a user with the Resource Administrator role is able to overwrite sensitive low-level files (such as /etc/passwd) using SFTP to modify user permissions, without Advanced Shell access. This is contrary to our definition for the Resource Administrator (RA) role restrictions.

Vulnerable Configurations

Part Description Count
Application
F5
718

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_SOL38941195.NASL
descriptionOn BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, 12.1.0-12.1.4, 11.6.1-11.6.3.4, and 11.5.2-11.5.8, a user with the Resource Administrator role is able to overwrite sensitive low-level files (such as /etc/passwd) using SFTP to modify user permissions, without Advanced Shell access. This is contrary to our definition for the Resource Administrator (RA) role restrictions. (CVE-2019-6617) Impact An attacker with the Resource Administrator role may be able to manipulate user privileges.
last seen2020-03-17
modified2019-05-01
plugin id124421
published2019-05-01
reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/124421
titleF5 Networks BIG-IP : BIG-IP Resource Administrator vulnerability (K38941195)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K38941195.
#
# The text description of this plugin is (C) F5 Networks.
#

include("compat.inc");

if (description)
{
  script_id(124421);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/09");

  script_cve_id("CVE-2019-6617");

  script_name(english:"F5 Networks BIG-IP : BIG-IP Resource Administrator vulnerability (K38941195)");
  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:
"On BIG-IP 14.0.0-14.1.0.1, 13.0.0-13.1.1.4, 12.1.0-12.1.4,
11.6.1-11.6.3.4, and 11.5.2-11.5.8, a user with the Resource
Administrator role is able to overwrite sensitive low-level files
(such as /etc/passwd) using SFTP to modify user permissions, without
Advanced Shell access. This is contrary to our definition for the
Resource Administrator (RA) role restrictions. (CVE-2019-6617)

Impact

An attacker with the Resource Administrator role may be able to
manipulate user privileges."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://support.f5.com/csp/article/K38941195"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade to one of the non-vulnerable versions listed in the F5
Solution K38941195."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/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:L/PR:L/UI:N/S:U/C:N/I:H/A:N");
  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:/a:f5:big-ip_webaccelerator");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/01");
  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 = "K38941195";
vmatrix = make_array();

# AFM
vmatrix["AFM"] = make_array();
vmatrix["AFM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["AFM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# AM
vmatrix["AM"] = make_array();
vmatrix["AM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["AM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# APM
vmatrix["APM"] = make_array();
vmatrix["APM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["APM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# ASM
vmatrix["ASM"] = make_array();
vmatrix["ASM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["ASM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# AVR
vmatrix["AVR"] = make_array();
vmatrix["AVR"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["AVR"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# GTM
vmatrix["GTM"] = make_array();
vmatrix["GTM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["GTM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# LC
vmatrix["LC"] = make_array();
vmatrix["LC"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["LC"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# LTM
vmatrix["LTM"] = make_array();
vmatrix["LTM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["LTM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# PEM
vmatrix["PEM"] = make_array();
vmatrix["PEM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["PEM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");

# WAM
vmatrix["WAM"] = make_array();
vmatrix["WAM"]["affected"  ] = make_list("14.0.0-14.1.0","13.0.0-13.1.1","12.0.0-12.1.4","11.6.1-11.6.3","11.5.2-11.5.8");
vmatrix["WAM"]["unaffected"] = make_list("15.0.0","14.1.0.2","13.1.1.5","12.1.4.1","11.6.4","11.5.9");


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