Vulnerabilities > CVE-2019-6642 - Unspecified vulnerability in F5 products

047910
CVSS 8.8 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
f5
nessus
NVD
Published: 2019-07-01
Updated: 2023-11-07

Summary

In BIG-IP 15.0.0, 14.0.0-14.1.0.5, 13.0.0-13.1.1.5, 12.1.0-12.1.4.2, and 11.5.2-11.6.4, BIG-IQ 6.0.0-6.1.0 and 5.1.0-5.4.0, iWorkflow 2.3.0, and Enterprise Manager 3.1.1, authenticated users with the ability to upload files (via scp, for example) can escalate their privileges to allow root shell access from within the TMOS Shell (tmsh) interface. The tmsh interface allows users to execute a secondary program via tools like sftp or scp.

Vulnerable Configurations

Part Description Count
Application
F5
989

Nessus

NASL familyF5 Networks Local Security Checks
NASL idF5_BIGIP_SOL40378764.NASL
descriptionAuthenticated users with the ability to upload files (via scp, for example) can escalate their privileges to allow root shell access from within the TMOS Shell ( tmsh )interface. The tmsh interface allows users to execute a secondary program via tools like sftp or scp . (CVE-2019-6642) Impact BIG-IP,BIG-IQ, F5 iWorkflow, and Enterprise Manager The affected systemsare incidentally protected against direct access to the Advanced Shell ( bash ); however, users who can upload an executable file (or script) can bypass this protection. Traffix SDC There is no impact for this productas itisnot affected by this vulnerability.
last seen2020-06-01
modified2020-06-02
plugin id127498
published2019-08-12
reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/127498
titleF5 Networks BIG-IP : F5 tmsh vulnerability (K40378764)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K40378764.
#
# The text description of this plugin is (C) F5 Networks.
#

include("compat.inc");

if (description)
{
  script_id(127498);
  script_version("1.5");
  script_cvs_date("Date: 2020/01/06");

  script_cve_id("CVE-2019-6642");

  script_name(english:"F5 Networks BIG-IP : F5 tmsh vulnerability (K40378764)");
  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:
"Authenticated users with the ability to upload files (via scp, for
example) can escalate their privileges to allow root shell access from
within the TMOS Shell ( tmsh )interface. The tmsh interface allows
users to execute a secondary program via tools like sftp or scp .
(CVE-2019-6642)

Impact

BIG-IP,BIG-IQ, F5 iWorkflow, and Enterprise Manager

The affected systemsare incidentally protected against direct access
to the Advanced Shell ( bash ); however, users who can upload an
executable file (or script) can bypass this protection.

Traffix SDC

There is no impact for this productas itisnot affected by this
vulnerability."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://support.f5.com/csp/article/K40378764"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade to one of the non-vulnerable versions listed in the F5
Solution K40378764."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/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:N/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:"2019/07/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/06/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/12");
  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 = "K40378764";
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","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["AFM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# AM
vmatrix["AM"] = make_array();
vmatrix["AM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["AM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# APM
vmatrix["APM"] = make_array();
vmatrix["APM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["APM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# ASM
vmatrix["ASM"] = make_array();
vmatrix["ASM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["ASM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# AVR
vmatrix["AVR"] = make_array();
vmatrix["AVR"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["AVR"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# GTM
vmatrix["GTM"] = make_array();
vmatrix["GTM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["GTM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# LC
vmatrix["LC"] = make_array();
vmatrix["LC"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["LC"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# LTM
vmatrix["LTM"] = make_array();
vmatrix["LTM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["LTM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# PEM
vmatrix["PEM"] = make_array();
vmatrix["PEM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["PEM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");

# WAM
vmatrix["WAM"] = make_array();
vmatrix["WAM"]["affected"  ] = make_list("15.0.0-15.0.1","14.0.0-14.1.2","13.0.0-13.1.2","12.1.0-12.1.4","11.5.2-11.6.5");
vmatrix["WAM"]["unaffected"] = make_list("15.1.0","15.0.1.1","14.1.2.1","14.0.1.1","13.1.3","12.1.5","11.6.5.1");


if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
  if (report_verbosity > 0) security_hole(port:0, extra:bigip_report_get());
  else security_hole(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