Vulnerabilities > CVE-2019-15992 - Out-of-bounds Write vulnerability in Cisco products

047910
CVSS 7.2 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
HIGH
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
cisco
CWE-787
nessus
NVD
Published: 2020-09-23
Updated: 2023-08-16

Summary

A vulnerability in the implementation of the Lua interpreter integrated in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying Linux operating system of an affected device. The vulnerability is due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. A successful exploit could allow the attacker to trigger a heap overflow condition and execute arbitrary code with root privileges on the underlying Linux operating system of an affected device.

Vulnerable Configurations

Part Description Count
Application
Cisco
188
OS
Cisco
140

Common Weakness Enumeration (CWE)

Nessus

  • NASL familyCISCO
    NASL idCISCO-SA-20191112-FTD-LUA-RCE.NASL
    descriptionA remote code execution vulnerability exists in the Lua interpreter of Cisco Firepower Threat Defense (FTD) software due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. An authenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands with root privileges on the underlying Linux operating system of an affected device. Please see the included Cisco BIDs and Cisco Security Advisory for more information. Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-05-16
    modified2019-11-22
    plugin id131229
    published2019-11-22
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/131229
    titleCisco Firepower Threat Defense RCE (cisco-sa-20191112-asa-ftd-lua-rce)
    code
    #
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(131229);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/15");

  script_cve_id("CVE-2019-15992");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr96680");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191112-asa-ftd-lua-rce");
  script_xref(name:"IAVA", value:"2019-A-0425-S");

  script_name(english:"Cisco Firepower Threat Defense RCE (cisco-sa-20191112-asa-ftd-lua-rce)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"A remote code execution vulnerability exists in the Lua interpreter of Cisco Firepower Threat Defense (FTD) software
due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. An
authenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands with root
privileges on the underlying Linux operating system of an affected device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191112-asa-ftd-lua-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e82478b");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr96680");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvr96680.");
  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:H/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-2019-15992");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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) 2019-2020 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('misc_func.inc');
include('ccf.inc');

product_info = cisco::get_product_info(name:'Cisco Firepower Threat Defense');
# Check is on a VDB build number, not version of product
vdb_build = product_info['VDB Version'];

report = '';
fixed_version = '329';
if (ver_compare(ver:vdb_build, fix:fixed_version, strict:FALSE) < 0)
{
  report += '\n  Installed VDB build : ' + vdb_build +
            '\n  Fixed VDB build     : ' + fixed_version +
            '\n  Cisco bug ID        : CSCvr96680' +
            '\n';
}

if (empty(report))
  audit(AUDIT_HOST_NOT, 'affected');

security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);
  • NASL familyCISCO
    NASL idCISCO-SA-20191112-ASA-LUA-RCE.NASL
    descriptionA remote code execution vulnerability exists in the Lua interpreter of Cisco Adaptive Security Appliance (ASA) software due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. An authenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands with root privileges on the underlying Linux operating system of an affected device. Please see the included Cisco BIDs and Cisco Security Advisory for more information. Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-05-16
    modified2019-11-22
    plugin id131228
    published2019-11-22
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/131228
    titleCisco Adaptive Security Appliance RCE (cisco-sa-20191112-asa-ftd-lua-rce)
    code
    #TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(131228);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/15");

  script_cve_id("CVE-2019-15992");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr85295");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191112-asa-ftd-lua-rce");
  script_xref(name:"IAVA", value:"2019-A-0425-S");

  script_name(english:"Cisco Adaptive Security Appliance RCE (cisco-sa-20191112-asa-ftd-lua-rce)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is affected by a remote code execution vulnerability");
  script_set_attribute(attribute:"description", value:
"A remote code execution vulnerability exists in the Lua interpreter of Cisco Adaptive Security Appliance (ASA) software
due to insufficient restrictions on the allowed Lua function calls within the context of user-supplied Lua scripts. An
authenticated, remote attacker can exploit this to bypass authentication and execute arbitrary commands with root
privileges on the underlying Linux operating system of an affected device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191112-asa-ftd-lua-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e82478b");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr85295");
  script_set_attribute(attribute:"solution", value:
"Cisco will release a fixed version in the future. Please refer to Cisco bug ID CSCvr85295.");
  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:H/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-2019-15992");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:adaptive_security_appliance_software");
  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) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "os_fingerprint.nasl");
  script_require_keys("Host/Cisco/ASA");

  exit(0);
}

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

product_info = cisco::get_product_info(name:'Cisco Adaptive Security Appliance (ASA) Software');

vuln_ranges = [
  {'min_ver' : '0.0',  'fix_ver' : '9.6.4.36'},
  {'min_ver' : '9.7',  'fix_ver' : '9.8.4.15'},
  {'min_ver' : '9.9',  'fix_ver' : '9.9.2.61'},
  {'min_ver' : '9.10',  'fix_ver' : '9.10.1.32'},
  {'min_ver' : '9.12',  'fix_ver' : '9.12.3'},
  {'min_ver' : '9.13',  'fix_ver' : '9.13.1.4'}
];

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'   , 'CSCvr85295'
);

cisco::check_and_report(
  product_info:product_info,
  reporting:reporting,
  vuln_ranges:vuln_ranges,
  workarounds:workarounds,
  workaround_params:workaround_params
);
  • NASL familyCISCO
    NASL idCISCO-SA-20191112-FMC-LUA-RCE.NASL
    descriptionAccording to its self-reported VDB version, Cisco Firepower Management Center is affected by a remote code execution vulnerability. An attacker with valid administrative credentials can configure an Advanced Detector on the FMC web interface and submit a malicious Lua script which, when pushed to a vulnerable managed FTD device, will escape the scripting sandbox and execute arbitrary code with root privileges on the underlying Linux operating system of the FTD device. Please see the included Cisco BIDs and Cisco Security Advisory for more information
    last seen2020-05-31
    modified2020-05-20
    plugin id136719
    published2020-05-20
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/136719
    titleCisco Firepower Management Center RCE (cisco-sa-20191112-asa-ftd-lua-rce)
    code
    #
# (C) Tenable Network Security, Inc.
#

include('compat.inc');

if (description)
{
  script_id(136719);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/27");

  script_cve_id("CVE-2019-15992");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvr96680");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20191112-asa-ftd-lua-rce");
  script_xref(name:"IAVA", value:"2019-A-0425");

  script_name(english:"Cisco Firepower Management Center RCE (cisco-sa-20191112-asa-ftd-lua-rce)");

  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 VDB version, Cisco Firepower Management Center is affected by a remote code execution
vulnerability. An attacker with valid administrative credentials can configure an Advanced Detector on the FMC web
interface and submit a malicious Lua script which, when pushed to a vulnerable managed FTD device, will escape the
scripting sandbox and execute arbitrary code with root privileges on the underlying Linux operating system of the FTD
device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191112-asa-ftd-lua-rce
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e82478b");
  script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/bugsearch/bug/CSCvr96680");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvr96680");
  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:H/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-2019-15992");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/05/20");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:firepower_management_center");
  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_firepower_version.nasl");
  script_require_keys("Host/Cisco/firepower_mc/version", "Settings/ParanoidReport");

  exit(0);
}

include('vcf.inc');

# Paranoid becausee it's only vulnerable if it manages a vulnerable FTD device
if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

version = get_kb_item('Host/Cisco/firepower_mc/version');

# Check for hotfixes
patch_history = get_kb_item('Host/Cisco/firepower_mc/patch_history');
if (
    patch_history =~ "Sourcefire_3D_Defense_Center_S3_Hotfix_DQ-6.2.3.16-2" ||
    patch_history =~ "Cisco_Firepower_Mgmt_Center_Hotfix_AK-6.3.0.6-2" ||
    # This one does not match advisory, see: https://community.cisco.com/t5/network-security/determine-patch-version-to-resolve-fmc-vulnerability/m-p/4017887
    patch_history =~ "Cisco_Firepower_Mgmt_Center_Hotfix_AA-6.4.0.8" ||
    patch_history =~ "Cisco_Firepower_Mgmt_Center_Hotfix_B-6.5.0.2-2"
   )
  audit(AUDIT_HOST_NOT, 'affected as a relevant hotfix has been applied');


app_info = vcf::get_app_info(app:'Cisco Firepower Management Center', kb_ver:'Host/Cisco/firepower_mc/version');
vcf::check_granularity(app_info:app_info, sig_segments:3);

constraints = [
  {'min_version': '0.0',     'fixed_version': '6.2.3.16'},
  {'min_version': '6.3.0',   'fixed_version': '6.3.0.6'},
  {'min_version': '6.4.0',   'fixed_version': '6.4.0.8'},
  {'min_version': '6.5.0',   'fixed_version': '6.5.0.2'}
];

vcf::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);

References