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{
  "document": {
    "acknowledgments": [
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        "summary": "This vulnerability was found by Andrew Chi, David McGrew, and Brandon Enright of Cisco during internal security testing."
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    ],
    "category": "csaf_security_advisory",
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        "category": "summary",
        "text": "A vulnerability in Cisco Unified IP Phones could allow an unauthenticated, remote attacker to impersonate another user\u0027s phone if the Cisco Unified Communications Manager (CUCM) is in secure mode.\r\n\r\nThis vulnerability is due to improper key generation during the manufacturing process that could result in duplicated manufactured keys installed on multiple devices. An attacker could exploit this vulnerability by performing a machine-in-the-middle attack on the secure communication between the phone and the CUCM. A successful exploit could allow the attacker to impersonate another user\u0027s phone.\r\n\r\nThis vulnerability cannot be addressed with software updates. There is a workaround that addresses 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-cp6901-dup-cert-82jdJGe4 [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cp6901-dup-cert-82jdJGe4\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected Cisco Unified IP Phone 6901 when the CUCM server is in secure mode. The secure mode is also known as mixed mode. Non-secure mode is the default mode of the CUCM.\r\n\r\nThis vulnerability also impacts the following Cisco IP Phones but they are past End-of-Support:\r\n    ATA 187 Analog Telephone Adapter  Unified IP Phone 6911  Unified IP Phone 6921  Unified IP Phone 6941  Unified IP Phone 6945  Unified IP Phone 6961  Unified IP Phone 8941  Unified IP Phone 8945  Unified IP Phone 8961  Unified IP Phone 9951  Unified IP Phone 9971",
        "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 is a workaround that addresses this vulnerability.\r\n\r\nAs a workaround for this vulnerability, install a Locally Significant Certificate (LSC):\r\n\r\nVerify that the CUCM certificate is up to date.\r\nOpen the phone configuration page.\r\nNavigate to Settings \u003e Security Configuration \u003e LSC.\r\nInstall the LSC.\r\n\r\nSee Configure LSC on Cisco IP Phone with CUCM [\"https://www.cisco.com/c/en/us/support/docs/content-networking/certificates/213295-how-to-install-an-lsc-on-a-cisco-ip-phon.html\"] for more details.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "This vulnerability cannot be addressed with software updates. There is a workaround that completely closes the attack vector for this vulnerability.",
        "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 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 by Andrew Chi, David McGrew, and Brandon Enright of Cisco during internal security testing.",
        "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",
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        "summary": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cp6901-dup-cert-82jdJGe4",
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        "summary": "Configure LSC on Cisco\u0026nbsp;IP Phone with CUCM",
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        "summary": "Security Vulnerability Policy",
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      "value": "A vulnerability in Cisco Unified IP Phones could allow an unauthenticated, remote attacker to impersonate another user\u0027s phone if the Cisco Unified Communications Manager (CUCM) is in secure mode. This vulnerability is due to improper key generation during the manufacturing process that could result in duplicated manufactured keys installed on multiple devices. An attacker could exploit this vulnerability by performing a machine-in-the-middle attack on the secure communication between the phone and the CUCM. A successful exploit could allow the attacker to impersonate another user\u0027s phone. This vulnerability cannot be addressed with software updates. There is a workaround that addresses this vulnerability."
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      "value": "Una vulnerabilidad en los tel\u00e9fonos IP de Cisco Unified podr\u00eda permitir a un atacante remoto no autenticado hacerse pasar por el tel\u00e9fono de otro usuario si Cisco Unified Communications Manager (CUCM) est\u00e1 en modo seguro. Esta vulnerabilidad es debido a la generaci\u00f3n inapropiada de claves durante el proceso de fabricaci\u00f3n que podr\u00eda resultar en claves fabricadas duplicadas instaladas en varios dispositivos. Un atacante podr\u00eda aprovechar esta vulnerabilidad al llevar a cabo un ataque de m\u00e1quina en el medio en la comunicaci\u00f3n segura entre el tel\u00e9fono y el CUCM. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante hacerse pasar por el tel\u00e9fono de otro usuario. Esta vulnerabilidad no puede abordarse con actualizaciones de software. Se presenta una mitigaci\u00f3n que aborda esta vulnerabilidad"
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