Vulnerabilities > CVE-2019-12699 - OS Command Injection vulnerability in Cisco products

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-78
nessus
NVD
Published: 2019-10-02
Updated: 2023-04-20

Summary

Multiple vulnerabilities in the CLI of Cisco FXOS Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to execute commands on the underlying operating system (OS) with root privileges. These vulnerabilities are due to insufficient input validation. An attacker could exploit these vulnerabilities by including crafted arguments to specific CLI commands. A successful exploit could allow the attacker to execute commands on the underlying OS with root privileges.

Vulnerable Configurations

Part Description Count
OS
Cisco
5
Hardware
Cisco
5
Application
Cisco
44

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
  • Command Delimiters
    An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
  • Exploiting Multiple Input Interpretation Layers
    An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
  • Argument Injection
    An attacker changes the behavior or state of a targeted application through injecting data or command syntax through the targets use of non-validated and non-filtered arguments of exposed services or methods.
  • OS Command Injection
    In this type of an attack, an adversary injects operating system commands into existing application functions. An application that uses untrusted input to build command strings is vulnerable. An adversary can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.

Nessus

  • NASL familyCISCO
    NASL idCISCO-SA-20191002-FXOS-CMD-INJECT-FTD.NASL
    descriptionAccording to its self-reported version, Cisco Firepower Threat Defense (FTD) Software is affected by multiple vulnerabilities in the CLI due to insufficient input validation. An unauthenticated, local attacker can exploit this, by including crafted arguments to specific commands, in order to execute arbitrary commands on the underlying OS with root privileges. Please see the included Cisco BIDs and Cisco Security Advisory for more information
    last seen2020-04-14
    modified2020-04-10
    plugin id135294
    published2020-04-10
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135294
    titleCisco FTD Software Command Injection (cisco-sa-20191002-fxos-cmd-inject)
    code
    #TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(135294);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/13");

  script_cve_id("CVE-2019-12699");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm14277");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm14279");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm25813");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm25894");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo42621");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo42651");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo83496");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191002-fxos-cmd-inject");
  script_xref(name:"IAVA", value:"2019-A-0370");

  script_name(english:"Cisco FTD Software Command Injection (cisco-sa-20191002-fxos-cmd-inject)");

  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 Firepower Threat Defense (FTD) Software is affected by multiple
vulnerabilities in the CLI due to insufficient input validation. An unauthenticated, local attacker can exploit this, by
including crafted arguments to specific commands, in order to execute arbitrary commands on the underlying OS with root
privileges.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-fxos-cmd-inject
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7ad074ec");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm14277");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm14279");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm25813");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm25894");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo42621");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo42651");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo83496");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version in the referenced Cisco bug IDs.");
  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-2019-12699");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:firepower");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:firepower_threat_defense");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "os_fingerprint.nasl", "cisco_enumerate_firepower.nbin", "cisco_asa_firepower_version.nasl");
  script_require_keys("installed_sw/Cisco Firepower Threat Defense");

  exit(0);
}

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

product_info = cisco::get_product_info(name:'Cisco Firepower Threat Defense');

if(product_info['model'] !~ "^(10|21)[0-9]{2}")
  audit(AUDIT_HOST_NOT, 'an affected model');

vuln_ranges = [
  {'min_ver' : '0',     'fix_ver': '6.2.3.14'},
  {'min_ver' : '6.3.0', 'fix_ver': '6.3.0.3'}
];

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

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvm14277, CSCvm14279, CSCvm25813, CSCvm25894, CSCvo42621, CSCvo42651, CSCvo83496'
);

cisco::check_and_report(
  product_info:product_info,
  workarounds:workarounds,
  workaround_params:workaround_params,
  reporting:reporting,
  vuln_ranges:vuln_ranges
);
  • NASL familyCISCO
    NASL idCISCO-SA-20191002-FXOS-CMD-INJECT.NASL
    descriptionAccording to its self-reported version, Cisco FXOS Software is affected by multiple vulnerabilities in the CLI due to insufficient input validation. An unauthenticated, local attacker can exploit this, by including crafted arguments to specific commands, in order to execute arbitrary commands on the underlying OS with root privileges. Please see the included Cisco BIDs and Cisco Security Advisory for more information
    last seen2020-04-14
    modified2020-04-10
    plugin id135295
    published2020-04-10
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135295
    titleCisco FXOS Software Command Injection (cisco-sa-20191002-fxos-cmd-inject)
    code
    #TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(135295);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/13");

  script_cve_id("CVE-2019-12699");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm14277");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm14279");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm25813");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvm25894");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo42621");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo42651");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvo83496");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191002-fxos-cmd-inject");
  script_xref(name:"IAVA", value:"2019-A-0370");

  script_name(english:"Cisco FXOS Software Command Injection (cisco-sa-20191002-fxos-cmd-inject)");

  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 FXOS Software is affected by multiple vulnerabilities in the CLI due to
insufficient input validation. An unauthenticated, local attacker can exploit this, by including crafted arguments to
specific commands, in order to execute arbitrary commands on the underlying OS with root privileges.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-fxos-cmd-inject
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7ad074ec");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm14277");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm14279");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm25813");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm25894");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo42621");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo42651");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo83496");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version in the referenced Cisco bug IDs.");
  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-2019-12699");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/10/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:fxos");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("cisco_enumerate_firepower.nbin", "cisco_asa_firepower_version.nasl");
  script_require_keys("installed_sw/FXOS");

  exit(0);
}

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

product_info = cisco::get_product_info(name:'FXOS');

if(product_info['model'] !~ "^(41|93)[0-9]{2}")
  audit(AUDIT_HOST_NOT, 'an affected model');

vuln_ranges = [
  {'min_ver' : '2.0',  'fix_ver': '2.2.2.101'},
  {'min_ver' : '2.3',  'fix_ver': '2.3.1.155'},
  {'min_ver' : '2.4',  'fix_ver': '2.4.1.238'}
];

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

reporting = make_array(
  'port'     , 0,
  'severity' , SECURITY_HOLE,
  'version'  , product_info['version'],
  'bug_id'   , 'CSCvm14277, CSCvm14279, CSCvm25813, CSCvm25894, CSCvo42621, CSCvo42651, CSCvo83496'
);

cisco::check_and_report(
  product_info:product_info,
  workarounds:workarounds,
  workaround_params:workaround_params,
  reporting:reporting,
  vuln_ranges:vuln_ranges
);

References