Cisco IOS, IOS XE, and IOS XR Software Link Layer Discovery Protocol Buffer Overflow Vulnerabilities
2018-03-28T16:00:00
ID CISCO-SA-20180328-LLDP Type cisco Reporter Cisco Modified 2018-05-02T13:54:25
Description
Multiple vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges on an affected device.
For more information about these vulnerabilities, see the Details ["#details"] section of this advisory.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp ["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp"]
This advisory is part of the March 28, 2018, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 20 Cisco Security Advisories that describe 22 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2018 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://tools.cisco.com/security/center/viewErp.x?alertId=ERP-66682"].
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EXECUTIVE SUMMARY\n\n * **CVSS v3 9.8**\n\n * **ATTENTION**: Exploitable remotely/low skill level to exploit.\n * **Vendor**: Rockwell Automation\n * **Equipment**: Allen-Bradley Stratix 5900 Services Router\n * **Vulnerabilities**: Improper Input Validation, Improper Restriction of Operations within the Bounds of a Memory Buffer, Use of Externally-Controlled Format String.\n\n## 2\\. RISK EVALUATION\n\nSuccessful exploitation of these vulnerabilities could result in loss of availability, confidentiality, and/or integrity caused by memory exhaustion, module restart, information corruption, and/or information exposure.\n\n## 3\\. TECHNICAL DETAILS\n\n### 3.1 AFFECTED PRODUCTS\n\nThe following versions of Allen-Bradley Stratix Services Router use a vulnerable version of Cisco IOS or IOS XE:\n\n * Allen-Bradley Stratix 5900 Services Router, version 15.6.3M1 and earlier.\n\n### 3.2 VULNERABILITY OVERVIEW\n\n### 3.2.1 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause a memory leak or a reload of an affected device that leads to a denial of service (DoS) condition.\n\nThe vulnerability is due to incorrect processing of certain IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device to be processed. A successful exploit could cause an affected device to continuously consume memory and eventually reload, resulting in a DoS condition.\n\n[CVE-2018-0158](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0158>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.2 [IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119](<https://cwe.mitre.org/data/definitions/119.html>)\n\nA vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\nThe vulnerability is due to incorrect bounds checking of certain values in packets that are destined for UDP port 18999 of an affected device. An attacker could exploit this vulnerability by sending malicious packets to an affected device. When the packets are processed, an exploitable buffer overflow condition may occur. A successful exploit could allow the attacker to execute arbitrary code on the affected device with elevated privileges. The attacker could also leverage this vulnerability to cause the device to reload, causing a temporary DoS condition while the device is reloading.\n\nThe malicious packets must be destined to and processed by an affected device. Traffic transiting a device will not trigger the vulnerability.\n\n[CVE-2018-0151](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0151>) has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.3 [IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119](<https://cwe.mitre.org/data/definitions/119.html>)\n\nA buffer overflow vulnerability in the LLDP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0167](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0167>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.4 [USE OF EXTERNALLY-CONTROLLED FORMAT STRING CWE-134](<https://cwe.mitre.org/data/definitions/134.html>)\n\nA format string vulnerability in the LLDP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0175](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0175>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.3 BACKGROUND\n\n * **Critical Infrastructure Sectors:** Critical Manufacturing, Energy, Water and Wastewater Systems\n * **Countries/Areas Deployed: **Worldwide\n * **Company Headquarters Location: **Wisconsin, USA\n\n### 3.4 RESEARCHER\n\nRockwell Automation reported these vulnerabilities to NCCIC from the semi-annual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.\n\n## 4\\. MITIGATIONS\n\nRockwell Automation has released knowledge base article 1073313 which can be found at the following location:\n\n<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073313/> (login required)\n\nCisco has released Snort Rules 46110 and 46111 to help address CVE-2018-0158 and CVE-2018-0151. See new rules at:\n\n<https://www.cisco.com/web/software/286271056/117258/sf-rules-2018-03-29-new.html>\n\nCVE-2018-0151: Users who do not use the Adaptive QoS for DMVPN feature can deny all traffic destined to UDP port 18999 on an affected device by using a Control Plane Policing (CoPP) policy. If the Adaptive QoS for DMVPN feature is later configured, the device must be upgraded to an unaffected release of Cisco IOS Software or Cisco IOS XE Software and the CoPP policy must be removed.\n\nCVE-2018-0167 and CVE-2018-0175 have no specific mitigations in place. See the following Cisco Vulnerability advisory for more details:\n\n<https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp>\n\nRockwell Automation also recommends that users implement the following general security guidelines:\n\n * Help minimize network exposure for all control system devices and/or systems, and confirm that they are not accessible from the Internet.\n * Locate control system networks and devices behind firewalls, and isolate them from the business network.\n * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.\n\nNCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nNCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.\n\nAdditional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.\n\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.\n\nNo known public exploits specifically target these vulnerabilities\n\n## \nContact Information\n\nFor any questions related to this report, please contact the CISA at: \n \nEmail: [CISAservicedesk@cisa.dhs.gov](<mailto:cisaservicedesk@cisa.dhs.gov>) \nToll Free: 1-888-282-0870\n\nFor industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics \nor incident reporting: https://us-cert.cisa.gov/report\n\nCISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.\n\nThis product is provided subject to this Notification and this [Privacy & Use](<https://www.dhs.gov/privacy-policy>) policy.\n\n**Please share your thoughts.**\n\nWe recently updated our anonymous [product survey](<https://surveymonkey.com/r/G8STDRY?product=https://us-cert.cisa.gov/ics/advisories/ICSA-18-107-03>); we'd welcome your feedback.\n", "edition": 15, "modified": "2018-04-25T00:00:00", "published": "2018-04-17T00:00:00", "id": "ICSA-18-107-03", "href": "https://www.us-cert.gov//ics/advisories/ICSA-18-107-03", "title": "Rockwell Automation Stratix Services Router", "type": "ics", "cvss": {"score": 10.0, "vector": "AV:N/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2020-12-18T03:22:51", "bulletinFamily": "info", "cvelist": ["CVE-2018-0172", "CVE-2018-0173", "CVE-2018-0175", "CVE-2018-0171", "CVE-2018-0158", "CVE-2018-0174", "CVE-2018-0167", "CVE-2018-0156"], "description": "## 1\\. EXECUTIVE SUMMARY\n\n * **CVSS v3 9.8**\n\n * **ATTENTION**: Exploitable remotely/low skill level to exploit.\n * **Vendor**: Rockwell Automation\n * **Equipment**: Allen-Bradley Stratix and ArmorStratix Switches\n * **Vulnerabilities**: Improper Input Validation, Resource Management Errors, Improper Restriction of Operations within the Bounds of a Memory Buffer, Use of Externally-Controlled Format String.\n\n## 2\\. RISK EVALUATION\n\nSuccessful exploitation of these vulnerabilities could result in loss of availability, confidentiality, and/or integrity caused by memory exhaustion, module restart, information corruption, and/or information exposure.\n\n## 3\\. TECHNICAL DETAILS\n\n### 3.1 AFFECTED PRODUCTS\n\nThe following versions of Allen-Bradley Stratix and ArmorStratix Switches use a vulnerable version of Cisco IOS or IOS XE:\n\n * Allen-Bradley Stratix 5400 Industrial Ethernet Switches, versions 15.2(6)E0a and earlier;\n * Allen-Bradley Stratix 5410 Industrial Distribution Switches, versions 15.2(6)E0a and earlier;\n * Allen-Bradley Stratix 5700 Industrial Managed Ethernet Switches, versions 15.2(6)E0a and earlier;\n * Allen-Bradley Stratix 8000 Modular Managed Ethernet Switches, versions 15.2(6)E0a and earlier;\n * Allen-Bradley ArmorStratix 5700 Industrial Managed Ethernet Switches for extreme environments, versions 15.2(6)E0a and earlier.\n\nUpdates for all affected products are now available and linked in the Mitigation section below.\n\n### 3.2 VULNERABILITY OVERVIEW\n\n### 3.2.1 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition, or to execute arbitrary code on an affected device.\n\nThe vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted Smart Install message to an affected device on TCP port 4786. A successful exploit could allow the attacker to cause a buffer overflow on the affected device.\n\n[CVE-2018-0171](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0171>) has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.2 [RESOURCE MANAGEMENT ERRORS CWE-399](<http://cwe.mitre.org/data/definitions/399.html>)\n\nA vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to trigger a reload of an affected device, resulting in a DoS condition.\n\nThe vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786.\n\n[CVE-2018-0156](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0156>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.3 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\n\n[CVE-2018-0174](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0174>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.4 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition.\n\n[CVE-2018-0172](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0172>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.5 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\n\n[CVE-2018-0173](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0173>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.6 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause a memory leak or a reload of an affected device that leads to a DoS condition.\n\nThe vulnerability is due to incorrect processing of certain IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device to be processed. A successful exploit could cause an affected device to continuously consume memory and eventually reload, resulting in a DoS condition.\n\n[CVE-2018-0158](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0158>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.7 [IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119](<https://cwe.mitre.org/data/definitions/119.html>)\n\nA buffer overflow vulnerability in the LLDP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0167](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0167>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.8 [USE OF EXTERNALLY-CONTROLLED FORMAT STRING CWE-134](<https://cwe.mitre.org/data/definitions/134.html>)\n\nA format string vulnerability in the LLDP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0175](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0175>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.3 BACKGROUND\n\n * **Critical Infrastructure Sectors:** Critical Manufacturing, Energy, Water and Wastewater Systems\n * **Countries/Areas Deployed: **Worldwide\n * **Company Headquarters Location:** Wisconsin, USA\n\n### 3.4 RESEARCHER\n\nRockwell Automation reported these vulnerabilities to NCCIC from the semi-annual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.\n\n## 4\\. MITIGATIONS\n\nRockwell Automation recommends users upgrade to FRN 15.2(6)E1 or later. Updated software can be downloaded at:\n\n<http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=15>\n\nRockwell Automation has provided knowledge base article number 1073268 on their website at the following location to address these vulnerabilities:\n\n<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073268/> (login required)\n\nRockwell Automation also recommends implementing the following mitigations in addition to upgrading the software version:\n\nCisco has released new Snort Rules at <https://www.cisco.com/web/software/286271056/117258/sf-rules-2018-03-29-new.html> to help address the following vulnerabilities:\n\n * CVE-2018-0171 - Snort Rule 46096 and 46097\n * CVE-2018-0156 - Snort Rule 41725\n * CVE-2018-0174 - Snort Rule 46120\n * CVE-2018-0172 - Snort Rule 46104\n * CVE-2018-0173 - Snort Rule 46119\n * CVE-2018-0158 - Snort Rule 46110\n\nCisco adds the following notes for the Smart Install vulnerabilities (CVE-2018-0171 and CVE-2018-0156):\n\n * Smart Install is turned off by express setup; however, upgraded switches but not re-setup may have it enabled.\n * Disable the Smart Install feature with the no vstack configuration command if it is not needed or once setup is complete.\n * Users who do use the feature\u2014and need to leave it enabled\u2014can use ACLs to block incoming traffic on TCP port 4786.\n\nCVE-2018-0167 and CVE-2018-0175 have no specific mitigations in place. See the following Cisco Vulnerability advisory for more details:\n\n<https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp>\n\nRockwell Automation also recommends users implement the following general security guidelines:\n\n * Help minimize network exposure for all control system devices and/or systems, and confirm that they are not accessible from the Internet.\n * Locate control system networks and devices behind firewalls, and isolate them from the business network.\n * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.\n\nNCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nNCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.\n\nAdditional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.\n\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.\n\nNo known public exploits specifically target these vulnerabilities.\n\n## \nContact Information\n\nFor any questions related to this report, please contact the CISA at: \n \nEmail: [CISAservicedesk@cisa.dhs.gov](<mailto:cisaservicedesk@cisa.dhs.gov>) \nToll Free: 1-888-282-0870\n\nFor industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics \nor incident reporting: https://us-cert.cisa.gov/report\n\nCISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.\n\nThis product is provided subject to this Notification and this [Privacy & Use](<https://www.dhs.gov/privacy-policy>) policy.\n\n**Please share your thoughts.**\n\nWe recently updated our anonymous [product survey](<https://surveymonkey.com/r/G8STDRY?product=https://us-cert.cisa.gov/ics/advisories/ICSA-18-107-04>); we'd welcome your feedback.\n", "edition": 17, "modified": "2018-04-25T00:00:00", "published": "2018-04-17T00:00:00", "id": "ICSA-18-107-04", "href": "https://www.us-cert.gov//ics/advisories/ICSA-18-107-04", "title": "Rockwell Automation Stratix and ArmorStratix Switches", "type": "ics", "cvss": {"score": 10.0, "vector": "AV:N/AC:L/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2020-12-18T03:21:57", "bulletinFamily": "info", "cvelist": ["CVE-2018-0172", "CVE-2018-0173", "CVE-2018-0175", "CVE-2018-0171", "CVE-2018-0155", "CVE-2018-0174", "CVE-2018-0167", "CVE-2018-0156"], "description": "## 1\\. EXECUTIVE SUMMARY\n\n * **CVSS v3 9.8**\n\n * **ATTENTION**: Exploitable remotely/low skill level to exploit.\n * **Vendor**: Rockwell Automation\n * **Equipment**: Allen-Bradley Stratix Industrial Managed Ethernet Switch\n * **Vulnerabilities**: Improper Input Validation, Resource Management Errors, 7PK \u2013 Errors, Improper Restriction of Operations within the Bounds of a Memory Buffer, Use of Externally-Controlled Format String.\n\n## 2\\. RISK EVALUATION\n\nSuccessful exploitation of these vulnerabilities could result in loss of availability, confidentiality, and/or integrity caused by memory exhaustion, module restart, information corruption, and/or information exposure.\n\n## 3\\. TECHNICAL DETAILS\n\n### 3.1 AFFECTED PRODUCTS\n\nThe following versions of Allen-Bradley Stratix Industrial Managed Ethernet Switch use a vulnerable version of Cisco IOS or IOS XE:\n\n * Allen-Bradley Stratix 8300 Industrial Managed Ethernet Switches, versions 15.2(4a)EA5 and earlier.\n\n### 3.2 VULNERABILITY OVERVIEW\n\n### 3.2.1 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition, or to execute arbitrary code on an affected device.\n\nThe vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted Smart Install message to an affected device on TCP port 4786. A successful exploit could allow the attacker to cause a buffer overflow on the affected device.\n\n[CVE-2018-0171](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0171>) has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.2 [RESOURCE MANAGEMENT ERRORS CWE-399](<https://cwe.mitre.org/data/definitions/399.html>)\n\nA vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to trigger a reload of an affected device, resulting in a DoS condition.\n\nThe vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786.\n\n[CVE-2018-0156](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0156>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.3 [7PK \u2013 ERRORS CWE-388](<https://cwe.mitre.org/data/definitions/388.html>)\n\nA vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation could allow an unauthenticated remote attacker to cause a crash of the iosd process, causing a DoS condition.\n\nThe vulnerability is due to insufficient error handling when the BFD header in a BFD packet is incomplete. An attacker could exploit this vulnerability by sending a crafted BFD message to or across an affected switch. A successful exploit could allow the attacker to trigger a reload of the system.\n\n[CVE-2018-0155](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0155>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.4 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\n\n[CVE-2018-0174](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0174>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.5 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition.\n\n[CVE-2018-0172](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0172>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.6 [IMPROPER INPUT VALIDATION CWE-20](<https://cwe.mitre.org/data/definitions/20.html>)\n\nA vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated remote attacker to cause an affected device to reload, resulting in a DoS condition.\n\nThe vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.\n\n[CVE-2018-0173](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0173>) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H>)).\n\n### 3.2.7 [IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119](<https://cwe.mitre.org/data/definitions/119.html>)\n\nA buffer overflow vulnerability in the LLDP subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0167](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0167>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.2.8 [USE OF EXTERNALLY-CONTROLLED FORMAT STRING CWE-134](<https://cwe.mitre.org/data/definitions/134.html>)\n\nA format string vulnerability in the LLDP subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an adjacent, unauthenticated attacker to cause a DoS condition or execute arbitrary code with elevated privileges.\n\n[CVE-2018-0175](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-0175>) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H>)).\n\n### 3.3 BACKGROUND\n\n * **Critical Infrastructure Sectors:** Critical Manufacturing, Energy, Water and Wastewater Systems\n * **Countries/Areas Deployed: **Worldwide\n * **Company Headquarters Location: **Wisconsin, USA\n\n### 3.4 RESEARCHER\n\nRockwell Automation reported these vulnerabilities to NCCIC from the semi-annual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.\n\n## 4\\. MITIGATIONS\n\nRockwell Automation has released the following knowledge base article 1073315:\n\n<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073315/> (login required)\n\nCisco has released new Snort Rules at <https://www.cisco.com/web/software/286271056/117258/sf-rules-2018-03-29-new.html> to help address the following vulnerabilities:\n\n * CVE-2018-0171 - Snort Rule 46096 and 46097\n * CVE-2018-0156 - Snort Rule 41725\n * CVE-2018-0174 - Snort Rule 46120\n * CVE-2018-0172 - Snort Rule 46104\n * CVE-2018-0173 - Snort Rule 46119\n\nCisco adds the following notes for the Smart Install vulnerabilities (CVE-2018-0171 and CVE-2018-0156):\n\n * Smart Install is turned off by express setup; however, upgraded switches but not re-setup may have it enabled.\n * Disable the Smart Install feature with the no vstack configuration command if it is not needed or once setup is complete.\n * Users who do use the feature\u2014and need to leave it enabled\u2014can use ACLs to block incoming traffic on TCP port 4786.\n\nCVE-2018-0155: Administrators who do not use the BFD feature in their environments can disable the BFD feature by using the feature bfd disable command in global configuration mode to prevent exploitation of this vulnerability. Administrators who do use the BFD feature can implement Control Plane Policing (CoPP) to allow processing of BFD packets from known BFD peers only and drop all other BFD traffic to limit exposure.\n\nCVE-2018-0167 and CVE-2018-0175 have no specific mitigations in place. See the following Cisco advisory for more details:\n\n<https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp>\n\nRockwell Automation also recommends that users implement the following general security guidelines:\n\n * Help minimize network exposure for all control system devices and/or systems, and confirm that they are not accessible from the Internet.\n * Locate control system networks and devices behind firewalls, and isolate them from the business network.\n * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.\n\nNCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\n\nNCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.\n\nAdditional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website.\n\nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.\n\nNo known public exploits specifically target these vulnerabilities. \n\n## \nContact Information\n\nFor any questions related to this report, please contact the CISA at: \n \nEmail: [CISAservicedesk@cisa.dhs.gov](<mailto:cisaservicedesk@cisa.dhs.gov>) \nToll Free: 1-888-282-0870\n\nFor industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics \nor incident reporting: https://us-cert.cisa.gov/report\n\nCISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.\n\nThis product is provided subject to this Notification and this [Privacy & Use](<https://www.dhs.gov/privacy-policy>) policy.\n\n**Please share your thoughts.**\n\nWe recently updated our anonymous [product survey](<https://surveymonkey.com/r/G8STDRY?product=https://us-cert.cisa.gov/ics/advisories/ICSA-18-107-05>); we'd welcome your feedback.\n", "edition": 17, "modified": "2018-04-25T00:00:00", "published": "2018-04-17T00:00:00", "id": "ICSA-18-107-05", "href": "https://www.us-cert.gov//ics/advisories/ICSA-18-107-05", "title": "Rockwell Automation Stratix Industrial Managed Ethernet Switch", "type": "ics", "cvss": {"score": 10.0, "vector": "AV:N/AC:L/Au:N/C:C/I:C/A:C"}}]}