{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank Katie Sexton and Jimi Sebree of Tenable Research for reporting these vulnerabilities."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the Secure Shell (SSH) authentication process of  Cisco Small Business Switches software could allow an  attacker to bypass client-side certificate authentication and revert to password authentication.\r\n  The  vulnerability exists because OpenSSH mishandles the authentication process.  An attacker could exploit this vulnerability by attempting to connect  to the device via SSH. A successful exploit could allow the attacker to access the configuration as an administrative user if the  default credentials are not changed.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects the following Cisco products running the software releases shown in the left column.\r\n                            Cisco Software Release             Cisco Switches\r\n                                         Prior to 1.4.10.6\r\n                          Small Business 200 Series Smart Switches\r\nSmall Business 300 Series Managed Switches\r\nSmall Business 500 Series Managed Switches                                            Prior to 2.5.0.78\r\n                          250 Series Smart Switches\r\n350 Series Managed Switches\r\n350X Series Managed Switches\r\n550X Series Stackable Managed Switches",
        "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.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds available; however, if client-side certificate authentication is enabled, disable it and use strong password authentication. Client-side certificate authentication is disabled by default.",
        "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 fixed this vulnerability in the following software releases.\r\n                            Cisco Software Release             Cisco Switches\r\n                                         1.4.10.6\r\n                          Small Business 200 Series Smart Switches\r\nSmall Business 300 Series Managed Switches\r\nSmall Business 500 Series Managed Switches                                             2.5.0.78\r\n                          250 Series Smart Switches\r\n350 Series Managed Switches\r\n350X Series Managed Switches\r\n550X Series Stackable Managed Switches\r\nCustomers can download the Cisco Small Business Switches Software from the Software Center [\"https://software.cisco.com/download/home\"] on Cisco.com by doing the following:\r\n\r\nClick Browse all.\r\nChoose Switches \u003e LAN Switches - Small Business.\r\nChoose one of the following:\r\n200 Series Smart Switches\r\n250 Series Smart Switches\r\n350X Series Stackable Managed Switches\r\n300 Series Managed Switches\r\n500 Series Stackable Managed Switches\r\n550X Series Stackable Managed Switches\r\n\r\n Choose the model number.\r\nChoose the firmware or the MIB software type.\r\nAccess releases by using the left pane of the Policy Suite for Mobile 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": "Cisco would like to thank Katie Sexton and Jimi Sebree of Tenable Research for reporting these vulnerabilities.",
        "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": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-scbv"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "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"
      }
    ],
    "title": "Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2019-05-01T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T22:46:55+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20190501-scbv",
      "initial_release_date": "2019-05-01T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2019-05-01T15:30:15+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 Small Business 200 Series Smart Switches",
            "product": {
              "name": "Cisco Small Business 200 Series Smart Switches ",
              "product_id": "CSAFPID-187434"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 300 Series Managed Switches",
            "product": {
              "name": "Cisco Small Business 300 Series Managed Switches ",
              "product_id": "CSAFPID-187435"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 500 Series Stackable Managed Switches",
            "product": {
              "name": "Cisco Small Business 500 Series Stackable Managed Switches ",
              "product_id": "CSAFPID-187436"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 250 Series Smart Switches Software",
            "product": {
              "name": "Cisco Small Business 250 Series Smart Switches Software ",
              "product_id": "CSAFPID-260896"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 350 Series Managed Switches Software",
            "product": {
              "name": "Cisco Small Business 350 Series Managed Switches Software ",
              "product_id": "CSAFPID-260897"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 350X Series Managed Switches Software",
            "product": {
              "name": "Cisco Small Business 350X Series Managed Switches Software ",
              "product_id": "CSAFPID-260898"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Small Business 550X Series Stackable Managed Switches Software",
            "product": {
              "name": "Cisco Small Business 550X Series Stackable Managed Switches Software ",
              "product_id": "CSAFPID-260899"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2019-1859",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvo28588"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvp35704"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-187435",
          "CSAFPID-187436",
          "CSAFPID-187434",
          "CSAFPID-260896",
          "CSAFPID-260898",
          "CSAFPID-260899",
          "CSAFPID-260897"
        ]
      },
      "release_date": "2019-05-01T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-260897",
            "CSAFPID-260899",
            "CSAFPID-260896",
            "CSAFPID-260898",
            "CSAFPID-187434",
            "CSAFPID-187435",
            "CSAFPID-187436"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-187435",
            "CSAFPID-187436",
            "CSAFPID-187434",
            "CSAFPID-260896",
            "CSAFPID-260898",
            "CSAFPID-260899",
            "CSAFPID-260897"
          ]
        }
      ],
      "title": "Cisco Small Business Series Switches SSH Certificate Authentication Bypass Vulnerability"
    }
  ]
}