cisco-sa-famp-zepdxy
Vulnerability from csaf_cisco
Published
2020-06-17 16:00
Modified
2020-06-17 16:00
Summary
Cisco AMP for Endpoints and ClamAV Privilege Escalation Vulnerability

Notes

Summary
A vulnerability in the endpoint software of Cisco AMP for Endpoints and Clam AntiVirus could allow an authenticated, local attacker to cause the running software to delete arbitrary files on the system. The vulnerability is due to a race condition that could occur when scanning malicious files. An attacker with local shell access could exploit this vulnerability by executing a script that could trigger the race condition. A successful exploit could allow the attacker to delete arbitrary files on the system that the attacker would not normally have privileges to delete, producing system instability or causing the endpoint software to stop working. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-famp-ZEpdXy ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-famp-ZEpdXy"]
Vulnerable Products
At the time of publication, this vulnerability affected the following products prior to the first fixed release: Cisco AMP for Endpoints (MacOS and Linux) ClamAV This vulnerability cannot be exploited on endpoints that are using Audit Policy Mode. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Impact on Cisco AMP for Endpoints (Windows) Cisco bug ID CSCvt98752 has been raised to investigate the full impact on the Windows Connector of the proof-of-concept exploit code for this vulnerability. The methods described in the RACK911 publication (described in Source ["#source"]) cannot be used to force the Windows Connector to quarantine files that are loaded into a process or as a process. However, they can impact supporting files that are necessary for the continued operation of the Connector. The team is investigating potential solutions to address this issue.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: Email Security Appliances (ESA) Web Security Appliances (WSA) Immunet
Details
Cisco AMP for Endpoints contains a feature known as guardrails to prevent accidentally blocking or quarantining legitimate applications and operating system components. This vulnerability involves a tight race condition in which the guardrails feature could be bypassed. Although Cisco ESA and Cisco WSA are not affected, they can be used to integrate with third-party antivirus engines. Those engines should be upgraded to a fixed version of software by the corresponding antivirus provider.
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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. Fixed Releases At the time of publication, this vulnerability was fixed in the following versions (and later): Cisco AMP for Endpoints - Linux version 1.12.4 Cisco AMP for Endpoints - MacOS version 1.12.4 ClamAV version 0.103 and 0.102.4 See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
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 aware that proof-of-concept exploit code is available for the vulnerability described in this advisory. The Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.
Source
This vulnerability was discovered when reviewing a publication by RACK911 on exploiting antivirus by using directory junctions and symlinks.
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.


To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was discovered when reviewing a publication by RACK911 on exploiting antivirus by using directory junctions and symlinks."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the endpoint software of Cisco AMP for Endpoints and Clam AntiVirus could allow an authenticated, local attacker to cause the running software to delete arbitrary files on the system.\r\n\r\nThe vulnerability is due to a race condition that could occur when scanning malicious files. An attacker with local shell access could exploit this vulnerability by executing a script that could trigger the race condition. A successful exploit could allow the attacker to delete arbitrary files on the system that the attacker would not normally have privileges to delete, producing system instability or causing the endpoint software to stop working.\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-famp-ZEpdXy [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-famp-ZEpdXy\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected the following products prior to the first fixed release:\r\n\r\nCisco AMP for Endpoints (MacOS and Linux)\r\nClamAV\r\n\r\nThis vulnerability cannot be exploited on endpoints that are using Audit Policy Mode.\r\n\r\nSee the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n  Impact on Cisco AMP for Endpoints (Windows)\r\nCisco bug ID CSCvt98752 has been raised to investigate the full impact on the Windows Connector of the proof-of-concept exploit code for this vulnerability. The methods described in the RACK911 publication (described in Source [\"#source\"]) cannot be used to force the Windows Connector to quarantine files that are loaded into a process or as a process. However, they can impact supporting files that are necessary for the continued operation of the Connector. The team is investigating potential solutions to address this issue.",
        "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 the following Cisco products:\r\n\r\nEmail Security Appliances (ESA)\r\nWeb Security Appliances (WSA)\r\nImmunet",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "Cisco AMP for Endpoints contains a feature known as guardrails to prevent accidentally blocking or quarantining legitimate applications and operating system components. This vulnerability involves a tight race condition in which the guardrails feature could be bypassed.\r\n\r\nAlthough Cisco ESA and Cisco WSA are not affected, they can be used to integrate with third-party antivirus engines. Those engines should be upgraded to a fixed version of software by the corresponding antivirus provider.",
        "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, this vulnerability was fixed in the following versions (and later):\r\n\r\nCisco AMP for Endpoints - Linux version 1.12.4\r\nCisco AMP for Endpoints - MacOS version 1.12.4\r\nClamAV version 0.103 and 0.102.4\r\n\r\nSee the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.",
        "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 aware that proof-of-concept exploit code is available for the vulnerability described in this advisory.\r\n\r\nThe Cisco PSIRT is not aware of any malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was discovered when reviewing a publication by RACK911 on exploiting antivirus by using directory junctions and symlinks.",
        "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 AMP for Endpoints and ClamAV Privilege Escalation Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-famp-ZEpdXy"
      },
      {
        "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-famp-ZEpdXy",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-famp-ZEpdXy"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
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        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco AMP for Endpoints and ClamAV Privilege Escalation Vulnerability",
    "tracking": {
      "current_release_date": "2020-06-17T16:00:00+00:00",
      "generator": {
        "date": "2022-10-22T03:04:05+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-famp-ZEpdXy",
      "initial_release_date": "2020-06-17T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2020-06-16T18:33:50+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 AMP for Endpoints",
            "product": {
              "name": "Cisco AMP for Endpoints ",
              "product_id": "CSAFPID-221075"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-3350",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvt98749"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvt98750"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-221075"
        ]
      },
      "release_date": "2020-06-17T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-221075"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-221075"
          ]
        }
      ],
      "title": "Evaluation of amp endpoint-linux for symlink race condition"
    }
  ]
}


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Nomenclature

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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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