{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the Multiprotocol Label Switching (MPLS) Operations, Administration, and Maintenance (OAM) implementation of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers  could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device.\r\n\r\nThe vulnerability is due to the incorrect handling of certain MPLS OAM packets. An attacker could exploit this vulnerability by sending malicious MPLS OAM packets to an affected device. A successful exploit could allow the attacker to cause the lspv_server process to crash. The crash could lead to system instability and the inability to process or forward traffic though the device, resulting in a DoS condition that require manual intervention to restore normal operating conditions.\r\n\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco Aggregation Services Router (ASR) 9000 Series when the following conditions are met:\r\n\r\nThe router is running Cisco IOS XR Software Release 5.3.3 Service Pack 10.\r\nThe router has the MPLS OAM feature configured.\r\n\r\nFor information about which Cisco IOS XR Software releases are vulnerable, see the Fixed Software [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos#fs\"] section of this advisory.\r\n\r\nDetermining Whether MPLS OAM Is Configured\r\n\r\nAdministrators can use the show running-config mpls oam command to determine whether MPLS OAM is enabled. The following example shows the output of the command for a device that has the MPLS OAM feature enabled:\r\n\r\n\r\nRP/0/RSP0/CPU0:ASR9001#show running-config mpls oam\r\nTue Feb 19 12:45:37.011 UTC\r\nmpls oam\r\n\r\nAn empty output of this command indicates that the device is not affected by the vulnerability described in this advisory.\r\n\r\nDetermining the Cisco IOS XR Software Release\r\n\r\nTo determine which Cisco IOS XR Software release is running on a device and the name of the device on which it is running, administrators can log in to the device and use the show version command in the CLI. If the device is running Cisco IOS XR Software, Cisco IOS XR Software or similar text appears in the system banner. The location and name of the system image file that is currently running on the device appears next to the System image file is text. The name of the hardware product appears on the line after the name of the system image file.\r\n\r\nThe following example shows the output of the show version command on a device that is running Cisco IOS XR Software release 5.3.3  Service Pack 10:\r\n\r\n\r\nRP/0/RSP0/CPU0:ASR9001#show version\r\nWed Jan 24 01:32:32.751 EST    Cisco IOS XR Software, Version 5.3.3[Default]  Copyright (c) 2017 by Cisco Systems, Inc.    ROM: System Bootstrap, Version 2.04(20140227:092320) [ASR9K ROMMON],      ASR9001 uptime is 6 hours, 17 minutes  System image file is \"bootflash:disk0/asr9k-os-mbi-5.3.3.sp10-1.0.0/0x100000/mbiasr9k-rp.vm\"    cisco ASR9K Series (P4040) processor with 8388608K bytes of memory.  P4040 processor at 1500MHz, Revision 2.0  ASR-9001 Chassis    2 Management Ethernet  8 TenGigE  20 GigabitEthernet  8 DWDM controller(s)  8 WANPHY controller(s)  44 GigabitEthernet/IEEE 802.3 interface(s)  219k bytes of non-volatile configuration memory.  2880M bytes of hard disk.  3932144k bytes of disk0: (Sector size 512 bytes).    Configuration register on node 0/RSP0/CPU0 is 0x2102",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has determined that this vulnerability does not affect Cisco Aggregation Services Router (ASR) 9000 Series that are not running Cisco IOS XR Software Release 5.3.3 Service Pack 10 or that have not enabled the MPLS OAM feature. Note: The MPLS OAM feature is not enabled by default on Cisco XR Software.\r\n\r\nNo other devices running Cisco IOS XR Software are affected. Cisco has also confirmed that this vulnerability does not affect devices running Cisco IOS Software, Cisco IOS XE Software, or Cisco NX-OS Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "The MPLS OAM feature helps service providers monitor label-switched paths (LSPs) and quickly isolate MPLS forwarding problems to assist with fault detection and troubleshooting in an MPLS network. The vulnerability is due to the incorrect handling of certain MPLS OAM packets. An attacker could exploit this vulnerability by sending malicious MPLS OAM packets to an affected device. To exploit this vulnerability, an attacker must have access to the same MPLS domain as the targeted device, which must be configured to process MPLS OAM packets. An exploitation of this vulnerability could cause the lspv_server process to crash, which could result in a DoS condition requiring manual intervention to recover.",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "Exploitation of this vulnerability could cause the affected device to generate an error message similar to the following:\r\n\r\n\r\n#RP/0/RSP0/CPU0:May  14 01:44:57.911 : dumper[60]: %OS-DUMPER-7 DUMP_REQUEST : Dump request for process pkg/bin/lspv_server\r\n RP/0/RSP0/CPU0:May  14 01:44:57.913 : dumper[60]: %OS-DUMPER-7-DUMP_ATTRIBUTE : Dump request with attribute 7 for process pkg/bin/lspv_server    RP/0/RSP0/CPU0:May  14 01:44:57.913 : dumper[60]: %OS-DUMPER-4-CRASH_INFO : Crashed pid = 561506 (pkg/bin/lspv_server)\r\n\r\nCustomers are advised to contact their support organization to review the error message and determine whether the device has been affected by exploitation of this vulnerability.",
        "title": "Indicators of Compromise"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.\r\n\r\nDisabling the MPLS OAM feature eliminates the exploit vector. Administrators can disable the MPLS OAM feature by using the no mpls oam command in global configuration mode. This action may be a suitable mitigation until devices that are affected by this vulnerability can be upgraded.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:\r\nhttps://www.cisco.com/c/en/us/products/end-user-license-agreement.html [\"https://www.cisco.com/c/en/us/products/end-user-license-agreement.html\"]\r\n\r\nAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.\r\n\r\nWhen 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 [\"https://www.cisco.com/go/psirt\"], to determine exposure and a complete upgrade solution.\r\n\r\nIn 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. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\n\r\nCustomers Without Service Contracts\r\n\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC:\r\nhttps://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]\r\n\r\nCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n\r\nFixed Releases\r\n\r\nCisco has released a software maintenance upgrade (SMU) for Cisco Aggregation Services Router (ASR) 9000 Series that addresses this vulnerability. The fix has also been incorporated into Service Pack 11 for Cisco IOS XR Software Release 5.3.3.\r\n                                IOS XR Release\r\n               SMU ID               ASR 9000 SMU Name                                   5.3.3               AA14582               asr9k-px-5.3.3.CSCvk63685\r\nThe SMU/service pack can be downloaded from the Software Center [\"https://software.cisco.com/download/home\"] on Cisco.com.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "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.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found during the resolution of a Cisco TAC support case.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "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. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA 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. The information in this document is intended for end users of Cisco products.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "Emergency Support:\r\n+1 877 228 7302 (toll-free within North America)\r\n+1 408 525 6532 (International direct-dial)\r\nNon-emergency Support:\r\nEmail: psirt@cisco.com\r\nSupport requests that are received via e-mail are typically acknowledged within 48 hours.",
      "issuing_authority": "Cisco product security incident response is the responsibility of the Cisco Product Security Incident Response Team (PSIRT). The Cisco PSIRT is a dedicated, global team that manages the receipt, investigation, and public reporting of security vulnerability information that is related to Cisco products and networks. The on-call Cisco PSIRT works 24x7 with Cisco customers, independent security researchers, consultants, industry organizations, and other vendors to identify possible security issues with Cisco products and networks.\r\nMore information can be found in Cisco Security Vulnerability Policy available at https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos"
      },
      {
        "category": "external",
        "summary": "Fixed Software",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos#fs"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html",
        "url": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "Software Center",
        "url": "https://software.cisco.com/download/home"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2019-05-15T16:00:00+00:00",
      "generator": {
        "date": "2022-09-03T03:01:49+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20190515-iosxr-mpls-dos",
      "initial_release_date": "2019-05-15T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2019-05-14T19:23:43+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco IOS XR Software",
            "product": {
              "name": "Cisco IOS XR Software ",
              "product_id": "CSAFPID-5834"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2019-1846",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvk63685"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-5834"
        ]
      },
      "release_date": "2019-05-15T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-5834"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-5834"
          ]
        }
      ],
      "title": "Cisco IOS XR Software MPLS OAM Denial of Service Vulnerability"
    }
  ]
}