{
  "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 implementation of the Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.\r\n\r\nThe vulnerability is due to incorrect processing of a BGP update message that contains a specific BGP attribute. An attacker could exploit this vulnerability by sending BGP update messages that include a specific, malformed attribute to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition.\r\n\r\nThe Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim\u2019s BGP network on an existing, valid TCP connection to a BGP peer.\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-20200122-ios-xr-bgp-dos [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected Cisco devices if they running a vulnerable release of Cisco IOS XR Software and are configured for BGP.\r\n\r\nCisco has confirmed that this vulnerability affects both Cisco IOS XR 32-bit Software and Cisco IOS XR 64-bit Software.\r\n\r\nFor information about which Cisco IOS XR Software releases were vulnerable at the time of publication, see the Fixed Software [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos#fs\"] section of this advisory.\r\n  Determine Whether the Device Has a Vulnerable Configuration\r\nTo determine whether the device is configured for BGP, administrators can use the show running-config router bgp EXEC command in the CLI. If the router is configured for BGP, this command will return output. The following example shows the partial output of the show running-config router bgp command on a device that is configured for BGP.\r\n\r\n\r\n#show running-config router bgp\r\nrouter bgp 65536  \u2026",
        "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 confirmed that this vulnerability does not affect Cisco IOS Software, Cisco IOS XE Software, or Cisco NX-OS Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "The specific, malformed BGP update attribute that can allow this vulnerability to be exploited is a non-transitive attribute. This means that this vulnerability affects only Interior BGP (iBGP). The bad attribute would be dropped at Autonomous System (AS) boundaries and could not be transmitted through Exterior BGP (eBGP).",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "When considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], 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  Fixed Releases\r\nAt the time of publication, Cisco planned to fix this vulnerability in Cisco IOS XR Software releases 7.0.2, 7.1.1, and 7.2.1.\r\n\r\nAt the time of publication, the SMUs in the following table were available. Customers who require SMUs for other platforms and releases  are advised to contact their support organization.\r\n                                IOS XR Release              Platform              SMU Name1\r\n                                              6.6.1\r\n              NCS5500\r\n              ncs5500-6.6.1.CSCvr91660\r\n                                  6.6.1\r\n              ASR9K-X64\r\n              asr9k-x64-6.6.1.CSCvr91660\r\n                                  6.6.1\r\n              NCS540\r\n              ncs540-6.6.1.CSCvr91660\r\n                                  6.6.1\r\n              NCS6K\r\n              ncs6k-6.6.1.CSCvr91660\r\n                                  6.6.2\r\n              ASR9K\r\n              asr9k-px-6.6.2.CSCvr91676\r\n                                  6.6.2\r\n              ASR9K-X64              asr9k-x64-6.6.2.CSCvr91676                                  6.6.2\r\n              CRS\r\n                                                 6.6.2\r\n              NCS5K\r\n                                  6.6.2\r\n              XRV9K\r\n              xrv9k-6.6.2.CSCvr91676\r\n                                  6.6.25\r\n              NCS540\r\n\r\n                                  6.6.25              NCS540L                                                 6.6.25              NCS560\r\n              ncs560-6.6.25.CSCvr91676\r\n                                  6.6.25\r\n              NCS5500\r\n              ncs5500-6.6.25.CSCvr91676\r\n                                  7.0.1\r\n              ASR9K-X64              asr9k-x64-7.0.1.CSCvr91676                                  7.0.1              NCS1K                                                 7.0.1              NCS5K\r\n                                  7.0.1              NCS6K\r\n\r\n                                  7.0.1              NCS540\r\n                                                 7.0.1              NCS540L\r\n\r\n                                  7.0.1              NCS560\r\n\r\n                                  7.0.1              NCS5500\r\n                                  7.0.1              XRV9K\r\n                                   1. Fixes for the vulnerability described in this advisory were provided in the fix for CSCvr91660 and CSCvr91676.\r\nCSCvr91660 includes the fixes for CSCvr84254, CSCvr74986, CSCvr74413, CSCvr80793, CSCvr83742, CSCvr74902, CSCvo90073, and CSCvr69950.\r\n\r\nCSCvr91676 includes the fixes for CSCvr84254, CSCvr74986, CSCvr74413, CSCvr80793, CSCvr83742, CSCvr74902, and CSCvr69950.\r\n\r\nFor information about fixed software releases, see the Details section in the bug ID(s) at the top of this advisory.\r\n\r\nTo download the SMUs from the Software Center [\"https://software.cisco.com/download/home\"] on Cisco.com [\"http://cisco.com/\"], do the following:\r\n\r\nClick Browse All.\r\nChoose IOS and NX-OS Software \u003e IOS XR \u003e IOS XR Software \u003e Optical Networking or Routers.\r\nChoose the appropriate product and model from the right pane of the product selector.\r\nChoose a release from the left pane of the product page.",
        "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 Border Gateway Protocol Attribute Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-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-20200122-ios-xr-bgp-dos",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos"
      },
      {
        "category": "external",
        "summary": "Fixed Software",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos#fs"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Software Center",
        "url": "https://software.cisco.com/download/home"
      },
      {
        "category": "external",
        "summary": "Cisco.com",
        "url": "http://cisco.com/"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco IOS XR Software Border Gateway Protocol Attribute Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2020-01-22T16:00:00+00:00",
      "generator": {
        "date": "2022-09-03T03:14:18+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20200122-ios-xr-bgp-dos",
      "initial_release_date": "2020-01-22T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2020-01-22T15:48:29+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-2019-15989",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvr69950"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-5834"
        ]
      },
      "release_date": "2020-01-22T16:00:00+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": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/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 Border Gateway Protocol Attribute Denial of Service Vulnerability"
    }
  ]
}