CDPwn - Cisco Discovery Protocol Vulnerabilities, As a matter of best-practice, and wherever possible, organisations should look to physically segment network traffic for “dirty”, IoT and/or “Guest” networks and environments. Additionally the attacker could gain privileged admin access to network devices, to allow them to launch man-in-the-middle attacks on the traffic traversing the affected devices, to intercept and redirect traffic to malicious sites or eavesdrop on network traffic to syphon off user credentials, passwords and other sensitive information. 8.8. An attacker could potentially take over all affected IP Phones and IP Cameras on a network simultaneously to either perform covert reconnaissance operations or to cause havoc and disrupt business operations. Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability (CVE-2020-3110). The Denial of Service vulnerabilities can allow attacks to invoke a memory overload and forced reboot of the affected devices. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software and are configured to use the Cisco Discovery Protocol. Cisco Security Advisory Cisco IOS XE Software Catalyst 4500 Cisco Discovery Protocol Denial of Service Vulnerability. If the device is running Cisco IOS XE Software, the system banner displays Cisco IOS Software, Cisco IOS XE Software, or similar text. By sending a specially crafted packet to a vulnerable device, an unauthenticated, adjacent attacker could achieve remote code execution or create a denial of service condition. An unauthenticated, adjacent attacker can exploit this to cause the device to reboot. Description The Cisco Internetwork Operating System (IOS) contains a vulnerability in its processing of Cisco Discovery Protocol … https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-cdp-dos. Cisco IOS XE Software Catalyst 4500 Cisco Discovery Protocol Denial of Service Vulnerability. To determine which Cisco IOS XE Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. Breaches, Alerts & Advisories, CVE-2020-3110 | CVE-2020-3111 | CVE-2020-3118 | CVE-2020-3119 | CVE-2020-3120, Integrity360 is actively monitoring a collection of 5 critical zero-day vulnerabilities, dubbed as “CDPwn”. To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. Thankfully, Cisco have released software updates for all affected devices; information on which can be found at https://cisco.com/security or by following the individual links to the Cisco Advisories. CDP is implemented in virtually all Cisco products including switches, router… To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker, that identifies any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (“First Fixed”). CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. This advisory is available at the following link: Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. CVE-2020-3111. Integrity360 is the trusted security advisor for some of the largest companies in Ireland and the UK. The following example shows the output of the command for a device that is running Cisco IOS Software Release 15.5(2)T1 and has an installed image name of C2951-UNIVERSALK9-M: For information about the naming and numbering conventions for Cisco IOS Software releases, see the Cisco IOS and NX-OS Software Reference Guide. A successful exploit could allow the attacker to exhaust memory on the affected device, resulting in a DoS condition. CVE-2020-3118. Four of the CVE-listed vulnerabilities are described as a critical remote-code execution holes; the fifth is a denial-of-service bug: Cisco FXOS, IOS XR and NX-OS Software Cisco Discovery Protocol Denial of Service Vulnerability, (CVE-2020-3120) Cisco NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability, (CVE-2020-3119) All Rights Reserved. CVE-2020-3118 is one of the five vulnerabilities in the Cisco Discovery Protocol (CDP) implementation of IOS XR software that were disclosed in February by IoT security firm Armis. When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution. Available Languages. Armis has discovered five critical, zero-day vulnerabilities in various implementations of the Cisco Discovery Protocol (CDP) that can allow remote attackers to completely take over devices without any user interaction. However, administrators may disable use of the Cisco Discovery Protocol by a device. Cisco Discovery Protocol (CDP) is a proprietary layer-2 networking protocol that Cisco devices use to gather information about devices connected to the network. ### Overview ### Cisco Discovery Protocol (CDP) is a proprietary layer-2 networking protocol that Cisco devices use to gather information about devices connected to the network. The information in this document is intended for end users of Cisco products. Collectively dubbed 'CDPwn,' the reported vulnerabilities reside in the various implementations of the Cisco Discovery Protocol (CDP) that comes enabled by default on virtually all Cisco devices and can not be turned OFF. Symptom: A vulnerability in the Cisco Discovery Protocol (CDP) implementation for the Cisco IP Phone could allow an unauthenticated, adjacent attacker to remotely execute code with root privileges or cause a reload of an affected IP phone. The vulnerability is due to insufficient validation of LLDP messages in the PROFINET LLDP message handler. Tags: CDPwnis a series of vulnerabilities in Cisco Discovery Protocol due to improper validation of Cisco Discovery Protocol messages. Document ID: 1553705157206107. Updated: March 27, 2019. Symptom: A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. As a matter of best-practice, and wherever possible, organisations should look to physically segment network traffic for “dirty”, IoT and/or “Guest” networks and environments. CDP is a Cisco proprietary Layer 2 (Data Link Layer) network protocol that is used to discover information about locally attached Cisco equipment. Cisco Discovery Protocol (CDP) is prone to Remote Code Execution and Denial of Service vulnerabilities, when an unauthenticated attacker sends maliciously crafted CDP packets to an affected device. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. The Remote Code Execution vulnerabilities can allow an attacker to execute arbitrary code with admin or root privilege on the affected devices. A vulnerability in the implementation of Cisco Discovery Protocol functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition. NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability cisco-sa-20200205-nxos-cdp-rce Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial-of-Service Vulnerability cisco-sa-20200205-ipcameras-rce-dos Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability. Cisco notes in their advisories that because Cisco Discovery Protocol is a Layer 2 protocol, an attacker “must be in the same broadcast domain as the affected device.” The following are the five vuln… CDPwn exposes vulnerabilities, four remote code executions, and one denial of service in the Cisco proprietary Layer 2 network discovery protocol that … THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. Cisco Discovery Protocol (CDP) is an administrative protocol that works at Layer 2 of the Internet Protocol (IP) stack. I modify my cdplldp tool for quick view CDP data on Nexus (but not only) 8.8. The vulnerability is due to improper memory handling by the affected software when the software processes high rates of Cisco Discovery Protocol packets that are sent to a device. Cisco Voice over Internet Protocol Phone Remote Code Execution and Denial of Service Vulnerability. In this scenario an attacker could leverage the CDPwn vulnerabilities to move laterally from a segmented/secured DMZ or “Internet-Only” network into other more sensitive areas of the corporate network, gaining access to critical systems, servers and file-stores. Cisco has confirmed that this vulnerability does not affect Cisco IOS XR Software or Cisco NX-OS Software. If any interfaces of the device are configured to use the protocol, the output of the command will show the protocol status and other information for each interface that is configured to use the protocol. To determine which Cisco IOS Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. Scenario 2: Data Exfiltration From Devices Like IP PhonesIn this scenario an attacker, who has already gained a foot hold in the network, could move laterally across the segments to target and gain Root access to affected IP Phones and IP Cameras. The output of the command displays detailed information about neighboring devices that were discovered by using the Cisco Discovery Protocol or, if use of the protocol is disabled, indicates that use of the protocol is not enabled, as shown in the following example: For detailed information about affected and fixed software releases, consult the Cisco IOS Software Checker. Exploitation of this vulnerability will cause an increase in the amount of memory that is used by the CDP process on a device, as shown in the following example: The memory will be released if exploitation stops. Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability. CSCvr09175 Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service Vulnerability Hi! Our expertise is depended upon to... © Copyright Integrity360 2016. There are no workarounds that address this vulnerability. To first determine whether use of the Cisco Discovery Protocol is enabled for a device, administrators can use the show cdp neighbors command in the device CLI. Customers can use this tool to perform the following tasks: To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS Software or Cisco IOS XE Software release—for example, 15.1(4)M2 or 3.13.8S—in the following field: By default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). Cisco Voice over Internet Protocol Phone Remote Code Execution and Denial of Service Vulnerability. Cisco Discovery Protocol is a Layer 2 protocol. This vulnerability was found during the resolution of a Cisco TAC support case. The Remote Code Execution vulnerabilities can allow an attacker to execute arbitrary code with admin or root privilege on the affected devices. Thankfully, Cisco have released software updates for all affected devices; information on which can be found at, Information Security Management Framework, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-ipcameras-rce-dos, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-voip-phones-rce-dos, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-iosxr-cdp-rce, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-nxos-cdp-rce, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200205-fxnxos-iosxr-cdp-dos, Digital Media Award shortlist for Best Strategy. (CVE-2020-3110 | CVE-2020-3111 | CVE-2020-3118 | CVE-2020-3119 | CVE-2020-3120). This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. A vulnerability in the PROFINET handler for Link Layer Discovery Protocol (LLDP) messages of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a crash on an affected device, resulting in a denial of service (DoS) condition. Securing against CDPwn Cisco has released patches for CDPwn vulnerabilities. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). If the device is running Cisco IOS Software, the system banner displays text similar to Cisco Internetwork Operating System Software or Cisco IOS Software. Armis, the team responsible for the disclosure, have cited two critical scenarios: Scenario 1: Breaking of Network Segmentation. Should you require assistance in identifying affected assets and/or applying the software updates, or if you have any immediate concerns about this threat to your business, please contact your account manager or email info@integrity360.com . Cisco Discovery Protocol is enabled on these products by default both globally and on all interfaces. A vulnerability in the implementation of Cisco Discovery Protocol functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition. The Cisco IOS contains a denial-of-service vulnerability that allows nearby remote attackers to crash or temporarily disable affected network devices. CVE-2020-3118. Cisco Discovery Protocol (CDP) is prone to Remote Code Execution and Denial of Service vulnerabilities, when an unauthenticated attacker sends maliciously crafted CDP packets to an affected device. ASR 9000 Series Aggregation Services Routers, Nexus 1000 Virtual Edge for VMware vSphere, Network Convergence System (NCS) 540 Routers, Network Convergence System (NCS) 560 Routers, Network Convergence System (NCS) 1000 Series, Network Convergence System (NCS) 5000 Series, Network Convergence System (NCS) 5500 Series, Network Convergence System (NCS) 6000 Series, Video Surveillance 8000 Series IP Cameras. Subscribe to Cisco Security Notifications, https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-cdp-dos, Cisco IOS and NX-OS Software Reference Guide, Cisco Security Advisories and Alerts page, Initiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse, Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication. 8.8. CVE-2020-3111. The vulnerability is due to insufficient validation of LLDP messages in the PROFINET LLDP message handler. The vulnerability is due to missing checks when processing CDP messages. As always, Integrity360 Managed Security Service customers will already be covered through our proactive security approach. The banner also displays the installed image name in parentheses, followed by the Cisco IOS Software release number and release name. ... (CVE-2020-3119) and a resource exhaustion denial-of-service vulnerability (CVE-2020-3120) in Cisco NX-OS switches and Cisco IOS XR Routers, among others. The vulnerability is due to improper processing of valid crafted Cisco Discovery Protocol packets. The following example shows the output of the command for a device that is running Cisco IOS XE Software Release 16.2.1 and has an installed image name of CAT3K_CAA-UNIVERSALK9-M: For information about the naming and numbering conventions for Cisco IOS XE Software releases, see the Cisco IOS and NX-OS Software Reference Guide. A vulnerability in Cisco Catalyst 4500 Series Switches running Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. According to its self-reported version, the Cisco NX-OS Software is affected by a denial of service vulnerability within the Cisco Discovery Protocol due to missing a check when processing protocol messages. Symptom: A vulnerability in the Cisco Discovery Protocol (CDP) or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. Priority: High Executive Summary: Armis (an IoT security company) discovered and disclosed five Cisco zero-day vulnerabilities which have been named (as a collective) ‘CDPwn’. They were discovered in the Cisco Discovery Protocol (CDP) [1-6] and consist of four remote code execution (RCE) vulnerabilities and a denial of service (DoS) vulnerability. Advisory ID: cisco-sa-20190327-evss. The list includes several vulnerabilities that were not known to have been targeted, including CVE-2020-3118, which impacts Cisco products. There are no workarounds that address this vulnerability. High. To disable use of the protocol for a specific interface of a device, use the no cdp enable command in the CLI. For information about which Cisco IOS and IOS XE Software releases are vulnerable, see the Fixed Software section of this advisory. Some Cisco devices do not support the show version command or may provide different output. To disable use of the protocol globally for a device, use the no cdp run command in the CLI. If the device is configured to use the protocol, the output of the command will be similar to the following example: To determine whether specific interfaces of a device are configured to use the Cisco Discovery Protocol and to display information about those interfaces, administrators can use the show cdp interface command in the CLI. Symptom: A vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition when the device unexpectedly reloads. A vulnerability in the PROFINET handler for Link Layer Discovery Protocol (LLDP) messages of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a crash on an affected device, resulting in a denial of service (DoS) condition. What is physical Social Engineering and why is it important? We accept, however, that this may not be practical or cost-effective in many circumstances in which case we would advise all organisations to ensure that they are able to adequately identify and patch all affected devices. Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability, (CVE-2020-3110) Armis' agentless device security platform is able to identify Cisco devices that are vulnerable to CDPwn and detect the presence of … A vulnerability in the PROFINET handler for Link Layer Discovery Protocol (LLDP) messages of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a crash on an affected device, resulting in a denial of service (DoS) condition. The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. We accept, however, that this may not be practical or cost-effective in many circumstances in which case we would advise all organisations to ensure that they are able to adequately identify and patch all affected devices. A vulnerability in the Cisco Discovery Protocol or Link Layer Discovery Protocol (LLDP) implementation for the Cisco IP Phone 7800 and 8800 Series could allow an unauthenticated, adjacent attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. These vulnerabilities impact a large […] It is, however, still recommended that these devices are reviewed and patched to the latest versions as a matter of best practice. Description. Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability [CVE-2020-3110]. Please note: The Armis report suggests Firepower 1000 Series and Firepower 2100 Series devices are affected by these vulnerabilities, however, Cisco Advisories explicitely state that they are not, so they have not been included in the above list. An attacker could exploit this vulnerability by sending a high rate of Cisco Discovery Protocol packets to an affected device. If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (“Combined First Fixed”). Cisco Video Surveillance 8000 Series IP Cameras Print. 8.8. The CDPwn collection contains four Remote Code Execution (RCE) vulnerabilities as well as one Denial of Service (DoS) vulnerability. To determine whether a device is configured to use the Cisco Discovery Protocol, administrators can log in to the device and use the show cdp global command in the CLI. While these vulnerabilities require the attacker to be in the same broadcast domain as the affected device (adjacent attacker presence), it is believed that attackers could exploit wide-spread IoT vulnerabilities to gain a foothold in a organisations environment, before exploiting the CDPwn vulnerabilities to break network segmentation, gain administrative access to core networking resources and move laterally through an organisation.
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