fkie_cve-2019-15998
Vulnerability from fkie_nvd
Published
2019-11-26 04:15
Modified
2024-11-21 04:29
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Summary
A vulnerability in the access-control logic of the NETCONF over Secure Shell (SSH) of Cisco IOS XR Software may allow connections despite an access control list (ACL) that is configured to deny access to the NETCONF over SSH of an affected device. The vulnerability is due to a missing check in the NETCONF over SSH access control list (ACL). An attacker could exploit this vulnerability by connecting to an affected device using NETCONF over SSH. A successful exploit could allow the attacker to connect to the device on the NETCONF port. Valid credentials are required to access the device. This vulnerability does not affect connections to the default SSH process on the device.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-iosxr-ssh-bypassVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-iosxr-ssh-bypassVendor Advisory
Impacted products
Vendor Product Version
cisco ios_xr 6.5.1
cisco ios_xr 6.5.2
cisco ios_xr 6.5.3
cisco asr_9001 -
cisco asr_9006 -
cisco asr_9010 -
cisco asr_9901 -
cisco asr_9904 -
cisco asr_9912 -
cisco asr_9922 -


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{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:cisco:ios_xr:6.5.1:*:*:*:*:*:*:*",
                     matchCriteriaId: "B2FD2C84-CD64-4C1C-BC38-2F7A2A6EEF45",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:cisco:ios_xr:6.5.2:*:*:*:*:*:*:*",
                     matchCriteriaId: "2DE98B34-501B-449A-843A-58F297EDBE1B",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:cisco:ios_xr:6.5.3:*:*:*:*:*:*:*",
                     matchCriteriaId: "86E05C3F-4095-4B9C-8C11-E32567EB14AC",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9001:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "324C97E6-1810-404F-9F45-6240F99FF039",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9006:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "57EB55BB-41B7-40A1-B6F5-142FE8AB4C16",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9010:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "433F4A82-04A4-4EAA-8C19-F7581DCD8D29",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9901:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "2D5E60AB-94FF-448A-89D8-5D2197E21C74",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9904:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "A93212A4-50AB-42E7-89A4-5FBBAEA050C3",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9912:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "5445CC54-ACFB-4070-AF26-F91FEAA85181",
                     vulnerable: false,
                  },
                  {
                     criteria: "cpe:2.3:h:cisco:asr_9922:-:*:*:*:*:*:*:*",
                     matchCriteriaId: "D7AA58E5-D7E1-48CF-93FF-C60EB85B2BC7",
                     vulnerable: false,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
         operator: "AND",
      },
   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "A vulnerability in the access-control logic of the NETCONF over Secure Shell (SSH) of Cisco IOS XR Software may allow connections despite an access control list (ACL) that is configured to deny access to the NETCONF over SSH of an affected device. The vulnerability is due to a missing check in the NETCONF over SSH access control list (ACL). An attacker could exploit this vulnerability by connecting to an affected device using NETCONF over SSH. A successful exploit could allow the attacker to connect to the device on the NETCONF port. Valid credentials are required to access the device. This vulnerability does not affect connections to the default SSH process on the device.",
      },
      {
         lang: "es",
         value: "Una vulnerabilidad en la lógica de control de acceso de NETCONF sobre Secure Shell (SSH) del Software Cisco IOS XR, puede permitir conexiones a pesar de una lista de control de acceso (ACL) configurada para denegar el acceso a NETCONF sobre SSH de un dispositivo afectado. La vulnerabilidad es debido a una falta de comprobación en la lista de control de acceso (ACL) de NETCONF sobre SSH. Un atacante podría explotar esta vulnerabilidad al conectarse en un dispositivo afectado usando NETCONF sobre SSH. Una explotación con éxito podría permitir al atacante conectar con el dispositivo en el puerto NETCONF. Unas credenciales válidas son requeridas para acceder al dispositivo. Esta vulnerabilidad no afecta las conexiones al proceso SSH predeterminado en el dispositivo.",
      },
   ],
   id: "CVE-2019-15998",
   lastModified: "2024-11-21T04:29:54.100",
   metrics: {
      cvssMetricV2: [
         {
            acInsufInfo: false,
            baseSeverity: "MEDIUM",
            cvssData: {
               accessComplexity: "LOW",
               accessVector: "NETWORK",
               authentication: "NONE",
               availabilityImpact: "NONE",
               baseScore: 5,
               confidentialityImpact: "NONE",
               integrityImpact: "PARTIAL",
               vectorString: "AV:N/AC:L/Au:N/C:N/I:P/A:N",
               version: "2.0",
            },
            exploitabilityScore: 10,
            impactScore: 2.9,
            obtainAllPrivilege: false,
            obtainOtherPrivilege: false,
            obtainUserPrivilege: false,
            source: "nvd@nist.gov",
            type: "Primary",
            userInteractionRequired: false,
         },
      ],
      cvssMetricV30: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "NETWORK",
               availabilityImpact: "NONE",
               baseScore: 5.3,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "LOW",
               privilegesRequired: "NONE",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
               version: "3.0",
            },
            exploitabilityScore: 3.9,
            impactScore: 1.4,
            source: "psirt@cisco.com",
            type: "Secondary",
         },
      ],
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "NETWORK",
               availabilityImpact: "NONE",
               baseScore: 5.3,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "LOW",
               privilegesRequired: "NONE",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
               version: "3.1",
            },
            exploitabilityScore: 3.9,
            impactScore: 1.4,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2019-11-26T04:15:12.547",
   references: [
      {
         source: "psirt@cisco.com",
         tags: [
            "Vendor Advisory",
         ],
         url: "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-iosxr-ssh-bypass",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Vendor Advisory",
         ],
         url: "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-iosxr-ssh-bypass",
      },
   ],
   sourceIdentifier: "psirt@cisco.com",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-284",
            },
         ],
         source: "psirt@cisco.com",
         type: "Secondary",
      },
      {
         description: [
            {
               lang: "en",
               value: "CWE-862",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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