Vulnerabilities > CVE-2019-1611 - Command Injection vulnerability in Cisco Fx-Os and Nx-Os
Attack vector
LOCAL Attack complexity
LOW Privileges required
NONE Confidentiality impact
COMPLETE Integrity impact
COMPLETE Availability impact
COMPLETE Summary
A vulnerability in the CLI of Cisco NX-OS Software and Cisco FXOS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device. The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability. Firepower 4100 Series Next-Generation Firewalls are affected running software versions prior to 2.2.2.91, 2.3.1.110, and 2.4.1.222. Firepower 9300 Security Appliance are affected running software versions prior to 2.2.2.91, 2.3.1.110, and 2.4.1.222. MDS 9000 Series Multilayer Switches are affected running software versions prior to 6.2(25) and 8.3(1). Nexus 3000 Series Switches are affected running software versions prior to 7.0(3)I4(9) and 7.0(3)I7(5). Nexus 3500 Platform Switches are affected running software versions prior to 7.0(3)I7(5). Nexus 3600 Platform Switches are affected running software versions prior to 7.0(3)F3(5). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected running software versions prior to 7.1(5)N1(1b) and 7.3(4)N1(1). Nexus 7000 and 7700 Series Switches are affected running software versions prior to 6.2(22), 7.3(3)D1(1), 8.2(3). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected running software versions prior to 7.0(3)I4(9) and 7.0(3)I7(5). Nexus 9500 R-Series Line Cards and Fabric Modules are affected running software versions prior to 7.0(3)F3(5).
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Cause Web Server Misclassification An attack of this type exploits a Web server's decision to take action based on filename or file extension. Because different file types are handled by different server processes, misclassification may force the Web server to take unexpected action, or expected actions in an unexpected sequence. This may cause the server to exhaust resources, supply debug or system data to the attacker, or bind an attacker to a remote process. This type of vulnerability has been found in many widely used servers including IIS, Lotus Domino, and Orion. The attacker's job in this case is straightforward, standard communication protocols and methods are used and are generally appended with malicious information at the tail end of an otherwise legitimate request. The attack payload varies, but it could be special characters like a period or simply appending a tag that has a special meaning for operations on the server side like .jsp for a java application server. The essence of this attack is that the attacker deceives the server into executing functionality based on the name of the request, i.e. login.jsp, not the contents.
- LDAP Injection An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.
- 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.
- File System Function Injection, Content Based An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
- 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.
Nessus
NASL family CISCO NASL id CISCO-SA-20190306-NXOS-CMDINJ-1611.NASL description According to its self-reported version, Cisco NX-OS Software is affected by a command injection vulnerability due to insufficient validation of arguments passed to certain CLI commands. An authenticated, local attacker with valid administrator credentials can exploit this by including malicious input as the argument of an affected command in order to execute arbitrary commands on the underlying operating system with elevated privileges. 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 seen 2020-03-26 modified 2019-12-04 plugin id 131700 published 2019-12-04 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131700 title Cisco NX-OS Software Command Injection (cisco-sa-20190306-nxos-cmdinj-1611) code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include('compat.inc'); if (description) { script_id(131700); script_version("1.6"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/25"); script_cve_id("CVE-2019-1611"); script_bugtraq_id(107381); script_xref(name:"CISCO-BUG-ID", value:"CSCvj63798"); script_xref(name:"CISCO-BUG-ID", value:"CSCvj65666"); script_xref(name:"CISCO-BUG-ID", value:"CSCvk65444"); script_xref(name:"CISCO-BUG-ID", value:"CSCvk65482"); script_xref(name:"CISCO-SA", value:"cisco-sa-20190306-nxos-cmdinj-1611"); script_name(english:"Cisco NX-OS Software Command Injection (cisco-sa-20190306-nxos-cmdinj-1611)"); 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 command injection vulnerability due to insufficient validation of arguments passed to certain CLI commands. An authenticated, local attacker with valid administrator credentials can exploit this by including malicious input as the argument of an affected command in order to execute arbitrary commands on the underlying operating system with elevated privileges. 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-20190306-nxos-cmdinj-1611 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?326bae04"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj63798"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj65666"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk65444"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk65482"); script_set_attribute(attribute:"solution", value: "Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvj63798, CSCvj65666, CSCvk65444, CSCvk65482."); 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: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-2019-1611"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/11"); script_set_attribute(attribute:"patch_publication_date", value:"2019/03/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/04"); 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) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("cisco_nxos_version.nasl"); script_require_keys("Host/Cisco/NX-OS/Version", "Host/Cisco/NX-OS/Model", "Host/Cisco/NX-OS/Device"); 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]{2}') || ('Nexus' >< product_info.device && product_info.model =~ '^7[07][0-9]{2}')) cbi = 'CSCvj63798'; else if('Nexus' >< product_info.device) { if(product_info.model =~ '^36[0-9]{2}' || product_info.model =~ '^95[0-9]{2}R') cbi = 'CSCvk65482'; else if(product_info.model =~ '^[26]0[0-9]{2}' || product_info.model =~ '^5[56][0-9]{2}') cbi = 'CSCvk65444'; else if(product_info.model =~ '^35[0-9]{2}' || product_info.model =~ '^[39]0[0-9]{2}') cbi = 'CSCvj65666'; } else audit(AUDIT_HOST_NOT, 'affected'); version_list = make_list( '4.1(2)', '4.1(3)', '4.1(4)', '4.1(5)', '5.0(2a)', '5.0(3)', '5.0(5)', '5.0(1a)', '5.0(1b)', '5.0(4)', '5.0(4b)', '5.0(4c)', 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'7.3(3)N1(1)', '8.0(1)', '8.1(1)', '8.1(2)', '8.1(2a)', '8.1(1a)', '8.1(1b)', '8.2(1)', '8.2(2)' ); reporting = make_array( 'port' , 0, 'severity' , SECURITY_HOLE, 'version' , product_info['version'], 'bug_id' , cbi ); workarounds = make_list(CISCO_WORKAROUNDS['no_workaround']); workaround_params = make_list(); cisco::check_and_report( product_info:product_info, reporting:reporting, vuln_versions:version_list, workarounds:workarounds, workaround_params:workaround_params );NASL family CISCO NASL id CISCO-SA-20190306-FXOS-CMDINJ-1611.NASL description According to its self-reported version, Cisco FXOS Software is affected by a command injection vulnerability due to insufficient validation of arguments passed to certain CLI commands. An authenticated, local attacker with valid administrator credentials can exploit this by including malicious input as the argument of an affected command in order to execute arbitrary commands on the underlying operating system with elevated privileges. 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 seen 2020-06-01 modified 2020-06-02 plugin id 131699 published 2019-12-04 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131699 title Cisco FXOS Software Command Injection (cisco-sa-20190306-nxos-cmdinj-1611) code # # (C) Tenable Network Security, Inc. # include('compat.inc'); if (description) { script_id(131699); script_version("1.3"); script_cvs_date("Date: 2020/01/09"); script_cve_id("CVE-2019-1611"); script_bugtraq_id(107381); script_xref(name:"CISCO-BUG-ID", value:"CSCvk65447"); script_xref(name:"CISCO-SA", value:"cisco-sa-20190306-nxos-cmdinj-1611"); script_name(english:"Cisco FXOS Software Command Injection (cisco-sa-20190306-nxos-cmdinj-1611)"); script_summary(english:"Checks the version of Cisco FXOS 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 FXOS Software is affected by a command injection vulnerability due to insufficient validation of arguments passed to certain CLI commands. An authenticated, local attacker with valid administrator credentials can exploit this by including malicious input as the argument of an affected command in order to execute arbitrary commands on the underlying operating system with elevated privileges. 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-20190306-nxos-cmdinj-1611 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?326bae04"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk65447"); script_set_attribute(attribute:"solution", value: "Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvk65447."); 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: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-2019-1611"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/11"); script_set_attribute(attribute:"patch_publication_date", value:"2019/03/06"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/04"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:firepower_threat_defense"); 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("cisco_enumerate_firepower.nbin", "cisco_asa_firepower_version.nasl"); script_require_keys("installed_sw/FXOS"); exit(0); } include('vcf.inc'); include('audit.inc'); include('cisco_workarounds.inc'); include('ccf.inc'); product_info = vcf::get_app_info(app:'FXOS'); # Use "Model" instead of "model" if( isnull(product_info['Model']) || product_info['Model'] !~ "^(41|93)[0-9]{2}$" ) audit(AUDIT_HOST_NOT, 'affected'); workarounds = make_list(CISCO_WORKAROUNDS['no_workaround']); workaround_params = make_list(); vuln_ranges = [ { 'min_ver' : '0.0' ,'fix_ver' : '2.2.2.91'}, { 'min_ver' : '2.3' ,'fix_ver' : '2.3.1.110'}, { 'min_ver' : '2.4' ,'fix_ver' : '2.4.1.222'} ]; reporting = make_array( 'port' , 0, 'severity' , SECURITY_HOLE, 'version' , product_info['version'], 'bug_id' , 'CSCvk65447' ); cisco::check_and_report( product_info:product_info, workarounds:workarounds, workaround_params:workaround_params, reporting:reporting, vuln_ranges:vuln_ranges );