Vulnerabilities > CVE-2019-1605 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Cisco Nx-Os

047910
CVSS 7.8 - HIGH
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
local
low complexity
cisco
CWE-119
nessus
NVD
Published: 2019-03-08
Updated: 2020-10-05

Summary

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary code as root. The vulnerability is due to incorrect input validation in the NX-API feature. An attacker could exploit this vulnerability by sending a crafted HTTP or HTTPS request to an internal service on an affected device that has the NX-API feature enabled. A successful exploit could allow the attacker to cause a buffer overflow and execute arbitrary code as root. Note: The NX-API feature is disabled by default. MDS 9000 Series Multilayer Switches are affected in versions prior to 8.1(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(8) and 7.0(3)I7(1). Nexus 3500 Platform Switches are affected in versions prior to 6.0(2)A8(8). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.3(2)N1(1). Nexus 7000 and 7700 Series Switches are affected in versions prior to 7.3(3)D1(1). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I4(8) and 7.0(3)I7(1). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

Vulnerable Configurations

Part Description Count
OS
Cisco
624
Hardware
Cisco
12

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyCISCO
NASL idCISCO-SA-20190306-NX-OS-API-EX.NASL
descriptionAccording to its self-reported version, Cisco NX-OS Software is affected by a vulnerability in the NX-API feature of Cisco NX-OS Software that could allow an authenticated, local attacker to execute arbitrary code as root. The vulnerability is due to incorrect input validation in the NX-API feature. An attacker could exploit this vulnerability by sending a crafted HTTP or HTTPS request to an internal service on an affected device that has the NX-API feature enabled. A successful exploit could allow the attacker to cause a buffer overflow and execute arbitrary code as root. Note: The NX-API feature is disabled by default. Please see the included Cisco BIDs and Cisco Security Advisory for more information
last seen2020-06-01
modified2020-06-02
plugin id132318
published2019-12-20
reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/132318
titleCisco NX-OS Software NX-API Arbitrary Code Execution Vulnerability
code
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(132318);
  script_version("1.4");
  script_cvs_date("Date: 2019/12/23");

  script_cve_id("CVE-2019-1605");
  script_bugtraq_id(107313);
  script_xref(name:"CISCO-BUG-ID", value:"CSCvh77526");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvi99224");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvi99225");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvi99227");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvi99228");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20190306-nx-os-api-ex");

  script_name(english:"Cisco NX-OS Software NX-API Arbitrary Code Execution Vulnerability");
  script_summary(english:"Checks the version of Cisco NX-OS Software");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability in the NX-API feature of
Cisco NX-OS Software that could allow an authenticated, local attacker to execute arbitrary code as root. The
vulnerability is due to incorrect input validation in the NX-API feature. An attacker could exploit this vulnerability
by sending a crafted HTTP or HTTPS request to an internal service on an affected device that has the NX-API feature
enabled. A successful exploit could allow the attacker to cause a buffer overflow and execute arbitrary code as root.
Note: The NX-API feature is disabled by default.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-api-ex
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4326b1dc");
  script_set_attribute(attribute:"see_also", value:"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-70757");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvh77526");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi99224");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi99225");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi99227");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvi99228");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvh77526, CSCvi99224, CSCvi99225, CSCvi99227, and
CSCvi99228");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/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: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:"cvss_score_source", value:"CVE-2019-1605");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/20");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:nx-os");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CISCO");

  script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_nxos_version.nasl");
  script_require_keys("Host/Cisco/NX-OS/Device", "Host/Cisco/NX-OS/Model", "Host/Cisco/NX-OS/Version");

  exit(0);
}

include('audit.inc');
include('cisco_workarounds.inc');
include('ccf.inc');

product_info = cisco::get_product_info(name:'Cisco NX-OS Software');

cbi = '';
if ('MDS' >< product_info.device && product_info.model =~ '^90[0-9][0-9]')
  cbi = 'CSCvi99225';
else if ('Nexus' >< product_info.device)
{
  if (product_info.model =~ '^[39]0[0-9][0-9]')
    cbi = 'CSCvh77526';
  else if (product_info.model =~ '^(36|95)[0-9][0-9]')
    cbi = 'CSCvi99224';
  else if (product_info.model =~ '^7[07][0-9][0-9]')
    cbi = 'CSCvi99225';
  else if (product_info.model =~ '^35[0-9][0-9]')
    cbi = 'CSCvi99227';
  else if (product_info.model =~ '^(20|5[56]|60)[0-9][0-9]')
    cbi = 'CSCvi99228';
  else
    audit(AUDIT_HOST_NOT, 'affected');
}
else
  audit(AUDIT_HOST_NOT, 'affected');

version_list=make_list(
  '7.3(2)D1(3a)',
  '7.3(2)D1(3)',
  '7.3(2)D1(2)',
  '7.3(2)D1(1)',
  '7.3(1)N1(1)',
  '7.3(1)DY(1)',
  '7.3(1)D1(1)',
  '7.3(0)N1(1)',
  '7.3(0)DY(1)',
  '7.3(0)DX(1)',
  '7.3(0)D1(1)',
  '7.2(2)D1(2)',
  '7.2(2)D1(1)',
  '7.2(1)D1(1)',
  '7.2(0)D1(1)',
  '7.0(3)IX1(2a)',
  '7.0(3)IX1(2)',
  '7.0(3)I6(2)',
  '7.0(3)I6(1)',
  '7.0(3)I5(2)',
  '7.0(3)I5(1)',
  '7.0(3)I4(7)',
  '7.0(3)I4(6)',
  '7.0(3)I4(5)',
  '7.0(3)I4(4)',
  '7.0(3)I4(3)',
  '7.0(3)I4(2)',
  '7.0(3)I4(1)',
  '7.0(3)I3(1)',
  '7.0(3)I2(5)',
  '7.0(3)I2(4)',
  '7.0(3)I2(3)',
  '7.0(3)I2(2e)',
  '7.0(3)I2(2d)',
  '7.0(3)I2(2c)',
  '7.0(3)I2(2b)',
  '7.0(3)I2(2a)',
  '7.0(3)I2(1)',
  '7.0(3)I1(3b)',
  '7.0(3)I1(3a)',
  '7.0(3)I1(3)',
  '7.0(3)I1(2)',
  '7.0(3)I1(1b)',
  '7.0(3)I1(1a)',
  '7.0(3)I1(1)',
  '7.0(3)F3(4)',
  '7.0(3)F3(3a)',
  '7.0(3)F3(3)',
  '7.0(3)F3(2)',
  '7.0(3)F3(1)',
  '7.0(3)F2(2)',
  '7.0(3)F2(1)',
  '7.0(3)F1(1)',
  '7.0(2)I2(2c)',
  '6.1(2)I3(5b)',
  '6.1(2)I3(5a)',
  '6.1(2)I3(5)',
  '6.1(2)I3(4e)',
  '6.1(2)I3(4d)',
  '6.1(2)I3(4c)',
  '6.1(2)I3(4b)',
  '6.1(2)I3(4a)',
  '6.1(2)I3(4)',
  '6.1(2)I3(3a)',
  '6.1(2)I3(3)',
  '6.1(2)I3(2)',
  '6.1(2)I3(1)',
  '6.1(2)I2(3)',
  '6.1(2)I2(2b)',
  '6.1(2)I2(2a)',
  '6.1(2)I2(2)',
  '6.1(2)I2(1)',
  '6.1(2)I1(3)',
  '6.1(2)I1(1)',
  '6.1(2)',
  '6.0(2)U6(9)',
  '6.0(2)U6(8)',
  '6.0(2)U6(7)',
  '6.0(2)U6(6)',
  '6.0(2)U6(5c)',
  '6.0(2)U6(5b)',
  '6.0(2)U6(5a)',
  '6.0(2)U6(5)',
  '6.0(2)U6(4a)',
  '6.0(2)U6(4)',
  '6.0(2)U6(3a)',
  '6.0(2)U6(3)',
  '6.0(2)U6(2a)',
  '6.0(2)U6(2)',
  '6.0(2)U6(1a)',
  '6.0(2)U6(10)',
  '6.0(2)U6(1)',
  '6.0(2)U5(4)',
  '6.0(2)U5(3)',
  '6.0(2)U5(2)',
  '6.0(2)U5(1)',
  '6.0(2)U4(4)',
  '6.0(2)U4(3)',
  '6.0(2)U4(2)',
  '6.0(2)U4(1)',
  '6.0(2)U3(9)',
  '6.0(2)U3(8)',
  '6.0(2)U3(7)',
  '6.0(2)U3(6)',
  '6.0(2)U3(5)',
  '6.0(2)U3(4)',
  '6.0(2)U3(3)',
  '6.0(2)U3(2)',
  '6.0(2)U3(1)',
  '6.0(2)U2(6)',
  '6.0(2)U2(5)',
  '6.0(2)U2(4)',
  '6.0(2)U2(3)',
  '6.0(2)U2(2)',
  '6.0(2)U2(1)',
  '6.0(2)U1(4)',
  '6.0(2)U1(3)',
  '6.0(2)U1(2)',
  '6.0(2)U1(1a)',
  '6.0(2)U1(1)',
  '6.0(2)A8(7b)',
  '6.0(2)A8(7a)',
  '6.0(2)A8(7)',
  '6.0(2)A8(6)',
  '6.0(2)A8(5)',
  '6.0(2)A8(4a)',
  '6.0(2)A8(4)',
  '6.0(2)A8(3)',
  '6.0(2)A8(2)',
  '6.0(2)A8(1)',
  '6.0(2)A7(2a)',
  '6.0(2)A7(2)',
  '6.0(2)A7(1a)',
  '6.0(2)A7(1)',
  '6.0(2)A6(8)',
  '6.0(2)A6(7)',
  '6.0(2)A6(6)',
  '6.0(2)A6(5b)',
  '6.0(2)A6(5a)',
  '6.0(2)A6(5)',
  '6.0(2)A6(4a)',
  '6.0(2)A6(4)',
  '6.0(2)A6(3a)',
  '6.0(2)A6(3)',
  '6.0(2)A6(2a)',
  '6.0(2)A6(2)',
  '6.0(2)A6(1a)',
  '6.0(2)A6(1)',
  '6.0(2)A4(6)',
  '6.0(2)A4(5)',
  '6.0(2)A4(4)',
  '6.0(2)A4(3)',
  '6.0(2)A4(2)',
  '6.0(2)A4(1)',
  '6.0(2)A3(4)',
  '6.0(2)A3(2)',
  '6.0(2)A3(1)',
  '6.0(2)A1(2d)',
  '6.0(2)A1(1f)',
  '6.0(2)A1(1e)',
  '6.0(2)A1(1d)',
  '6.0(2)A1(1c)',
  '6.0(2)A1(1b)',
  '6.0(2)A1(1a)',
  '6.0(2)A1(1)',
  '5.0(3)U5(1j)',
  '5.0(3)U5(1i)',
  '5.0(3)U5(1h)',
  '5.0(3)U5(1g)',
  '5.0(3)U5(1f)',
  '5.0(3)U5(1e)',
  '5.0(3)U5(1d)',
  '5.0(3)U5(1c)',
  '5.0(3)U5(1b)',
  '5.0(3)U5(1a)',
  '5.0(3)U5(1)',
  '5.0(3)U4(1)',
  '5.0(3)U3(2b)',
  '5.0(3)U3(2a)',
  '5.0(3)U3(2)',
  '5.0(3)U3(1)',
  '5.0(3)U2(2d)',
  '5.0(3)U2(2c)',
  '5.0(3)U2(2b)',
  '5.0(3)U2(2a)',
  '5.0(3)U2(2)',
  '5.0(3)U2(1)',
  '5.0(3)U1(2a)',
  '5.0(3)U1(2)',
  '5.0(3)U1(1d)',
  '5.0(3)U1(1c)',
  '5.0(3)U1(1b)',
  '5.0(3)U1(1a)',
  '5.0(3)U1(1)',
  '5.0(3)A1(2a)',
  '5.0(3)A1(2)',
  '5.0(3)A1(1)'
);

workarounds = make_list(CISCO_WORKAROUNDS['nxos_nxapi']);
workaround_params = make_list();


reporting = make_array(
'port'     , 0,
'severity' , SECURITY_HOLE,
'version'  , product_info['version'],
'bug_id'   , cbi
);

cisco::check_and_report(product_info:product_info, workarounds:workarounds, workaround_params:workaround_params, reporting:reporting, vuln_versions:version_list);

References