{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the Secure Sockets Layer (SSL) packet reassembly functionality of the detection engine in Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause the detection engine to consume excessive system memory on an affected device, which could cause a denial of service (DoS) condition.\r\n\r\nThe vulnerability is due to the affected software improperly handling changes to SSL connection states. An attacker could exploit this vulnerability by sending crafted SSL connections through an affected device. A successful exploit could allow the attacker to cause the detection engine to consume excessive system memory on the affected device, which could cause a DoS condition. The device may need to be reloaded manually to recover from this condition.\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-20180418-fpsnort [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco Firepower System Software Releases 6.0.0 and later, if the software is configured as described in this section and the software is running on any of the following Cisco products:\r\n\r\nAdaptive Security Appliance (ASA) 5500-X Series Firewalls with FirePOWER Services\r\nAdaptive Security Appliance (ASA) 5500-X Series Next-Generation Firewalls\r\nAdvanced Malware Protection (AMP) for Networks, 7000 Series Appliances\r\nAdvanced Malware Protection (AMP) for Networks, 8000 Series Appliances\r\nFirepower 4100 Series Appliances\r\nFirePOWER 7000 Series Appliances\r\nFirePOWER 8000 Series Appliances\r\nFirepower 9300 Series Security Appliances\r\nFirepower Threat Defense for Integrated Services Routers (ISRs)\r\nFirepower Threat Defense Virtual for VMware\r\nIndustrial Security Appliance 3000\r\nSourcefire 3D System Appliances\r\n\r\nA device is vulnerable if the software is configured to pass encrypted traffic that matches an SSL policy rule or has a default rule action of Do not decrypt.\r\n  Determining the Cisco Firepower System Software Release\r\nTo determine which Cisco Firepower System Software release is running on a device, administrators can log in to the device and use the show version command in the CLI. The following example shows the output of the command for a device that is running Release 6.2.0:\r\n\r\n\r\n\u003e show version\r\n\r\n---------------------[ ftd ]---------------------\r\nModel : Cisco ASA5525-X Threat Defense (75) Version 6.2.0 (Build 362)\r\nUUID : 2849ba3c-ecb8-11e6-98ca-b9fc2975893c\r\nRules update version : 2017-03-15-001-vrt\r\nVDB version : 279\r\n----------------------------------------------------",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "No other Cisco products are currently 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\nAdaptive Security Appliance (ASA) Software\r\nFirepower Management Center\r\nIntrusion Prevention System (IPS) Software\r\nMeraki MX Security Appliances\r\nNext-Generation Intrusion Prevention System (NGIPSv) for VMware\r\nSnort IPS for Integrated Services Routers (ISRs)",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "This vulnerability could cause the Snort process to exhaust system memory on an affected device and restart. While the Snort process is restarting, threat detection could be bypassed, inspection of all network traffic could fail, or network traffic could be prevented from passing through the device, depending on the platform and device configuration.\r\n\r\nOn Cisco FirePOWER platforms:\r\n\r\nPassive and bypass interfaces will bypass inspection and traffic will pass through the device.\r\nRouted, switched, and nonbypass interfaces will drop the traffic; traffic will not pass through the device.\r\nCisco Firepower Threat Defense (FTD) Software will drop the traffic; traffic will not pass through the device.\r\n\r\nOn Cisco ASA 5500-X Series Firewalls with FirePOWER Services, traffic will bypass threat detection and will not be dropped, if the sfr fail-open CLI command is supported and configured on the ASA.",
        "title": "Details"
      },
      {
        "category": "general",
        "text": "Exploitation of this vulnerability could cause the following error message to appear in the /var/log/messages system log file for an affected device:\r\n\r\n\r\nFirepower-module2 kernel: [109568.659049] snort invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0\r\n\r\nContact the Cisco Technical Assistance Center (TAC) if additional assistance is required to determine whether the device has been compromised by this vulnerability.",
        "title": "Indicators of Compromise"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "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  Fixed Releases\r\nCustomers should upgrade to an appropriate release as indicated in the table in this section. To help ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories:\r\n\r\ncisco-sa-20180418-fp2100 [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fp2100\"]: Cisco Firepower 2100 Series Security Appliances IP Fragmentation Denial of Service Vulnerability\r\ncisco-sa-20180418-fpsnort [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort\"]: Cisco Firepower Detection Engine Secure Sockets Layer Denial of Service Vulnerability\r\n\r\nIn the following table, the left column lists releases of Cisco software. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by all the vulnerabilities described in this collection of advisories and which release includes fixes for those vulnerabilities.\r\n                                              Cisco Firepower System Software                            First Fixed Release for This Vulnerability              First Fixed Release for All Vulnerabilities Described in the Collection of Advisories                                                6.0                                          6.1.0.6                                          6.1.0.6                                                              6.0.1                                          6.1.0.6                                          6.1.0.6                                                              6.1.0                                          6.1.0.6 or later                                          6.1.0.6                                                              6.2.0                                          6.2.0.3 or later                                          6.2.0.5                                                              6.2.1                                          Not vulnerable                                          6.2.2.1                                                              6.2.2                                          Not vulnerable                                          6.2.2.1                                                              6.2.3                                          Not vulnerable                            6.2.3",
        "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": "This vulnerability was found during the resolution of a Cisco TAC support case.",
        "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 Firepower Detection Engine Secure Sockets Layer Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort"
      },
      {
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        "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-20180418-fpsnort",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort"
      },
      {
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        "summary": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html",
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      },
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      },
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        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "cisco-sa-20180418-fp2100",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fp2100"
      },
      {
        "category": "external",
        "summary": "cisco-sa-20180418-fpsnort",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Firepower Detection Engine Secure Sockets Layer Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2020-05-18T15:38:13+00:00",
      "generator": {
        "date": "2022-09-03T03:15:51+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20180418-fpsnort",
      "initial_release_date": "2018-04-18T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2018-04-18T15:40:38+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2019-11-19T20:29:38+00:00",
          "number": "1.1.0",
          "summary": "Updated internal metadata release information."
        },
        {
          "date": "2020-05-18T15:38:13+00:00",
          "number": "1.2.0",
          "summary": "Added the Cisco bug identifier CSCve23031."
        }
      ],
      "status": "final",
      "version": "1.2.0"
    }
  },
  "product_tree": {
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      {
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          {
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        "category": "vendor",
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  },
  "vulnerabilities": [
    {
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      "ids": [
        {
          "system_name": "Cisco Bug ID",
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        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-205007"
        ]
      },
      "release_date": "2018-04-18T16:00:00+00:00",
      "remediations": [
        {
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          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-205007"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
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            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-205007"
          ]
        }
      ],
      "title": "Cisco Firepower Detection Engine Secure Sockets Layer Denial of Service Vulnerability"
    }
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        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2018-04-19T20:29:00.580",
  "references": [
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      "url": "http://www.securityfocus.com/bid/103930"
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    },
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      "tags": [
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  "vulnStatus": "Modified",
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      "source": "ykramarz@cisco.com",
      "type": "Secondary"
    },
    {
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          "value": "CWE-400"
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      ],
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}

{
  "affected": [],
  "aliases": [
    "CVE-2018-0233"
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  "database_specific": {
    "cwe_ids": [
      "CWE-400"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-04-19T20:29:00Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability in the Secure Sockets Layer (SSL) packet reassembly functionality of the detection engine in Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause the detection engine to consume excessive system memory on an affected device, which could cause a denial of service (DoS) condition. The vulnerability is due to the affected software improperly handling changes to SSL connection states. An attacker could exploit this vulnerability by sending crafted SSL connections through an affected device. A successful exploit could allow the attacker to cause the detection engine to consume excessive system memory on the affected device, which could cause a DoS condition. The device may need to be reloaded manually to recover from this condition. This vulnerability affects Cisco Firepower System Software Releases 6.0.0 and later, running on any of the following Cisco products: Adaptive Security Appliance (ASA) 5500-X Series Firewalls with FirePOWER Services, Adaptive Security Appliance (ASA) 5500-X Series Next-Generation Firewalls, Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances, Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances, Firepower 4100 Series Appliances, FirePOWER 7000 Series Appliances, FirePOWER 8000 Series Appliances, Firepower 9300 Series Security Appliances, Firepower Threat Defense for Integrated Services Routers (ISRs), Firepower Threat Defense Virtual for VMware, Industrial Security Appliance 3000, Sourcefire 3D System Appliances. Cisco Bug IDs: CSCve23031.",
  "id": "GHSA-wchf-39q2-hfmr",
  "modified": "2022-05-13T01:35:33Z",
  "published": "2022-05-13T01:35:33Z",
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-0233"
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      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-fpsnort"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/103930"
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  "severity": [
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      "type": "CVSS_V3"
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    "id": "GSD-2018-0233"
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      "details": "A vulnerability in the Secure Sockets Layer (SSL) packet reassembly functionality of the detection engine in Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause the detection engine to consume excessive system memory on an affected device, which could cause a denial of service (DoS) condition. The vulnerability is due to the affected software improperly handling changes to SSL connection states. An attacker could exploit this vulnerability by sending crafted SSL connections through an affected device. A successful exploit could allow the attacker to cause the detection engine to consume excessive system memory on the affected device, which could cause a DoS condition. The device may need to be reloaded manually to recover from this condition. This vulnerability affects Cisco Firepower System Software Releases 6.0.0 and later, running on any of the following Cisco products: Adaptive Security Appliance (ASA) 5500-X Series Firewalls with FirePOWER Services, Adaptive Security Appliance (ASA) 5500-X Series Next-Generation Firewalls, Advanced Malware Protection (AMP) for Networks, 7000 Series Appliances, Advanced Malware Protection (AMP) for Networks, 8000 Series Appliances, Firepower 4100 Series Appliances, FirePOWER 7000 Series Appliances, FirePOWER 8000 Series Appliances, Firepower 9300 Series Security Appliances, Firepower Threat Defense for Integrated Services Routers (ISRs), Firepower Threat Defense Virtual for VMware, Industrial Security Appliance 3000, Sourcefire 3D System Appliances. Cisco Bug IDs: CSCve23031.",
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      "lastModifiedDate": "2019-10-09T23:31Z",
      "publishedDate": "2018-04-19T20:29Z"
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}