cisco-sa-20190807-asa-multi
Vulnerability from csaf_cisco
Published
2019-08-07 16:00
Modified
2019-08-29 13:00
Summary
Cisco Adaptive Security Appliance Smart Tunnel Vulnerabilities

Notes

Summary
Multiple vulnerabilities in the smart tunnel functionality of Cisco Adaptive Security Appliance (ASA) could allow an authenticated, local attacker to elevate privileges to the root user or load a malicious library file while the tunnel is being established. For more information about these vulnerabilities, see the Details ["#details"] section of this security advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi"]
Vulnerable Products
These vulnerabilities affect Cisco ASA Software. For information about which Cisco ASA Software releases are vulnerable, see the Fixed Software ["#fs"] section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by these vulnerabilities.
Details
Two vulnerabilities in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to elevate privileges to the root user or load a malicious library file during execution. The vulnerabilities are not dependent on one another; exploitation of one of the vulnerabilities is not required to exploit the other vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerability. Details about the vulnerabilities are as follows. Cisco Adaptive Security Appliance Smart Tunnel Privilege Escalation Vulnerability A vulnerability in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to elevate privileges to the root user. This privilege escalation happens on a client device that attempts to establish a smart tunnel connection with the Cisco ASA. The escalation does not occur on the ASA itself. The vulnerability occurs because the Cisco ASA smart tunnel creates local system files on the client device with file permissions that are not restrictive enough. In addition, the ASA smart tunnel does not validate the system commands in these local system files before executing them. An attacker could exploit this vulnerability by running a malicious script on the client device when a valid user is establishing the Cisco ASA smart tunnel connection. A successful exploit could allow the attacker to elevate privileges to root on the client machine without the user's knowledge. The attacker needs valid device credentials on the local client device to exploit this vulnerability. The CVE ID for this vulnerability is: CVE-2019-1944 Cisco Adaptive Security Appliance Smart Tunnel Library File Load Vulnerability A vulnerability in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to overwrite specific system files, which could then be loaded and executed during smart tunnel connection establishment. The attacker could take these actions on the client device that is attempting to establish the smart tunnel connection with the Cisco ASA and not on the ASA itself. The vulnerability occurs because the Cisco ASA can write files to specific locations on the file system, and the smart tunnel functionality does not validate the integrity of system files that load during execution. An attacker could exploit this vulnerability by creating a malicious system file and writing it to a specific location on the file system when a valid user is establishing the Cisco ASA smart tunnel connection. A successful exploit could allow the attacker to cause the smart tunnel to load a malicious executable. The attacker needs valid device credentials on the local client device to exploit this vulnerability. The CVE ID for this vulnerability is: CVE-2019-1945
Workarounds
There are no workarounds that address these vulnerabilities.
Fixed Software
Cisco has released free software updates that address the vulnerabilities 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: https://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"] Additionally, 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. 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. In 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. Customers Without Service Contracts Customers 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: https://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"] Customers 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. Fixed Releases Customers are advised to upgrade to an appropriate release as indicated in the applicable table in this section. In the following table(s), the left column lists Cisco software releases and the right column indicates whether a release is affected by the vulnerabilities described in this advisory and the release that includes the fix for these vulnerabilities. Cisco ASA Software Cisco ASA Software Release First Fixed Release for These Vulnerabilities Earlier than 9.41 9.4.4.37 9.4 9.4.4.37 9.51 9.6.4.30 9.6 9.6.4.30 9.71 9.8.4.7 9.8 9.8.4.7 9.9 9.10.1.22 9.10 9.10.1.22 9.12 9.12.2.1 1. Cisco ASA Software releases earlier than Release 9.4 and Cisco ASA Software Releases 9.5 and 9.7 have reached end of maintenance. Customers should migrate to a supported release that includes the fix for these vulnerabilities.
Vulnerability Policy
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.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
Source
Cisco would like to thank Francesco Giordano of Hacktive Security for reporting these vulnerabilities.
Legal Disclaimer
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. A 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.


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{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank Francesco Giordano of Hacktive Security for reporting these vulnerabilities."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "Multiple vulnerabilities in the smart tunnel functionality of Cisco Adaptive Security Appliance (ASA) could allow an authenticated, local attacker to elevate privileges to the root user or load a malicious library file while the tunnel is being established.\r\n\r\nFor more information about these vulnerabilities, see the Details [\"#details\"] section of this security advisory.\r\n\r\nCisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.\r\n\r\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-asa-multi\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "These vulnerabilities affect Cisco ASA Software.\r\n\r\nFor information about which Cisco ASA Software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by these vulnerabilities.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "Two vulnerabilities in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to elevate privileges to the root user or load a malicious library file during execution.\r\n\r\nThe vulnerabilities are not dependent on one another; exploitation of one of the vulnerabilities is not required to exploit the other vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerability.\r\n\r\nDetails about the vulnerabilities are as follows.\r\n\r\nCisco Adaptive Security Appliance Smart Tunnel Privilege Escalation Vulnerability\r\n\r\n\r\nA vulnerability in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to elevate privileges to the root user. This privilege escalation happens on a client device that attempts to establish a smart tunnel connection with the Cisco ASA. The escalation does not occur on the ASA itself.\r\n\r\nThe vulnerability occurs because the Cisco ASA smart tunnel creates local system files on the client device with file permissions that are not restrictive enough. In addition, the ASA smart tunnel does not validate the system commands in these local system files before executing them. An attacker could exploit this vulnerability by running a malicious script on the client device when a valid user is establishing the Cisco ASA smart tunnel connection. A successful exploit could allow the attacker to elevate privileges to root on the client machine without the user\u0027s knowledge. The attacker needs valid device credentials on the local client device to exploit this vulnerability.\r\n\r\n\r\nThe CVE ID for this vulnerability is: CVE-2019-1944\r\n\r\nCisco Adaptive Security Appliance Smart Tunnel Library File Load Vulnerability\r\n\r\n\r\nA vulnerability in the smart tunnel functionality of Cisco ASA could allow an authenticated, local attacker to overwrite specific system files, which could then be loaded and executed during smart tunnel connection establishment. The attacker could take these actions on the client device that is attempting to establish the smart tunnel connection with the Cisco ASA and not on the ASA itself.\r\n\r\nThe vulnerability occurs because the Cisco ASA can write files to specific locations on the file system, and the smart tunnel functionality does not validate the integrity of system files that load during execution. An attacker could exploit this vulnerability by creating a malicious system file and writing it to a specific location on the file system when a valid user is establishing the Cisco ASA smart tunnel connection. A successful exploit could allow the attacker to cause the smart tunnel to load a malicious executable. The attacker needs valid device credentials on the local client device to exploit this vulnerability.\r\n\r\n\r\nThe CVE ID for this vulnerability is: CVE-2019-1945",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address these vulnerabilities.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerabilities 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:  https://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 [\"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  Customers Without Service Contracts\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  Fixed Releases\r\nCustomers are advised to upgrade to an appropriate release as indicated in the applicable table in this section. In the following table(s), the left column lists Cisco software releases and the right column indicates whether a release is affected by the vulnerabilities described in this advisory and the release that includes the fix for these vulnerabilities.\r\n\r\nCisco ASA Software\r\n                                Cisco ASA Software Release              First Fixed Release for These Vulnerabilities\r\n                                              Earlier than 9.41\r\n              9.4.4.37\r\n                                  9.4\r\n              9.4.4.37\r\n                                  9.51\r\n               9.6.4.30\r\n                                  9.6               9.6.4.30\r\n                                  9.71\r\n               9.8.4.7\r\n                                  9.8              9.8.4.7                                   9.9              9.10.1.22\r\n                                  9.10              9.10.1.22                                  9.12              9.12.2.1                    1. Cisco ASA Software releases earlier than Release 9.4 and Cisco ASA Software Releases 9.5 and 9.7 have reached end of maintenance. Customers should migrate to a supported release that includes the fix for these vulnerabilities.",
        "title": "Fixed Software"
      },
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        "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 vulnerabilities that are described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "Cisco would like to thank Francesco Giordano of Hacktive Security for reporting these vulnerabilities.",
        "title": "Source"
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        "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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    "references": [
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      },
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        "url": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
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        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
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    "title": "Cisco Adaptive Security Appliance Smart Tunnel Vulnerabilities",
    "tracking": {
      "current_release_date": "2019-08-29T13:00:21+00:00",
      "generator": {
        "date": "2022-09-03T03:42:16+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20190807-asa-multi",
      "initial_release_date": "2019-08-07T16:00:00+00:00",
      "revision_history": [
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          "date": "2019-08-07T14:01:24+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
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        }
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  },
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            "name": "Cisco Adaptive Security Appliance (ASA) Software",
            "product": {
              "name": "Cisco Adaptive Security Appliance (ASA) Software ",
              "product_id": "CSAFPID-6588"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2019-1945",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvo78789"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-6588"
        ]
      },
      "release_date": "2019-08-07T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-6588"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-6588"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Smart Tunnel Library File Load Vulnerability"
    },
    {
      "cve": "CVE-2019-1944",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvo78789"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-6588"
        ]
      },
      "release_date": "2019-08-07T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-6588"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-6588"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Smart Tunnel Privilege Escalation Vulnerability"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.