cisco-sa-cbw-dos-ysmbuqx3
Vulnerability from csaf_cisco
Published
2023-09-27 16:00
Modified
2023-09-27 16:00
Summary
Cisco Wireless LAN Controller AireOS Software Denial of Service Vulnerability

Notes

Summary
A vulnerability in the memory buffer of Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause memory leaks that could eventually lead to a device reboot. This vulnerability is due to memory leaks caused by multiple clients connecting under specific conditions. An attacker could exploit this vulnerability by causing multiple wireless clients to attempt to connect to an access point (AP) on an affected device. A successful exploit could allow the attacker to cause the affected device to reboot after a significant amount of time, resulting in a denial of service (DoS) condition. Cisco has released software updates that address this vulnerability. There is a workaround that addresses this vulnerability.
Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco devices if they were running a vulnerable release of Cisco WLC AireOS Software and they had the Random MAC Filtering feature enabled: Mobility Express Virtual Wireless LAN Controller (vWLC) For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software ["#fs"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Determine Whether Random MAC Filtering is Enabled To determine whether Random MAC Filtering is enabled on an affected device, log in to the device and use the show wlan id command. The following example shows the output of the show wlan id command for a Cisco 3500 Series Wireless Controller on which Random MAC Filtering is enabled on wlan 1: (3500-3-AX) >show wlan 1 WLAN Identifier.................................. 1 Profile Name..................................... wpa2-dot1x Network Name (SSID).............................. wpa2-dot1x Status........................................... Enabled MAC Filtering.................................... Disabled Broadcast SSID................................... Enabled Random MAC Filtering............................. Enabled
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: 2504 Wireless Controllers 3504 Wireless Controllers 5508 Wireless Controllers 5520 Wireless Controllers 8510 Wireless Controllers 8540 Wireless Controllers Flex 7510 Wireless Controllers IOS Software IOS XE Software IOS XR Software Meraki products NX-OS Software
Workarounds
There is a workaround that addresses this vulnerability. Administrators can disable the Random Mac Filtering feature on the affected device using the following CLI command: 3500-3-AX (config-wlan)# no local-admin-mac deny While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.
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 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, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability. Cisco WLC AireOS Software Release First Fixed Release 8.9 and earlier Not vulnerable 8.10.101 to 8.10.142.0 Not vulnerable 8.10.150 to 8.10.185 8.10.190.0 The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
Vulnerability Policy
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["http://www.cisco.com/web/about/security/psirt/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 PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source
This vulnerability was found during the resolution of a Cisco TAC support case.
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": "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 memory buffer of Cisco Wireless LAN Controller (WLC) AireOS Software could allow an unauthenticated, adjacent attacker to cause memory leaks that could eventually lead to a device reboot.\r\n\r\nThis vulnerability is due to memory leaks caused by multiple clients connecting under specific conditions. An attacker could exploit this vulnerability by causing multiple wireless clients to attempt to connect to an access point (AP) on an affected device. A successful exploit could allow the attacker to cause the affected device to reboot after a significant amount of time, resulting in a denial of service (DoS) condition.\r\n\r\nCisco has released software updates that address this vulnerability. There is a workaround that addresses this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected the following Cisco devices if they were running a vulnerable release of Cisco WLC AireOS Software and they had the Random MAC Filtering feature enabled:\r\n\r\nMobility Express\r\nVirtual Wireless LAN Controller (vWLC)\r\n\r\nFor information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software [\"#fs\"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nDetermine Whether Random MAC Filtering is Enabled\r\n\r\nTo determine whether Random MAC Filtering is enabled on an affected device, log in to the device and use the show wlan id command.\r\n\r\nThe following example shows the output of the show wlan id command for a Cisco 3500 Series Wireless Controller on which Random MAC Filtering is enabled on wlan 1:\r\n\r\n\r\n(3500-3-AX) \u003eshow wlan 1\r\n\r\nWLAN Identifier.................................. 1\r\nProfile Name..................................... wpa2-dot1x\r\nNetwork Name (SSID).............................. wpa2-dot1x\r\nStatus........................................... Enabled\r\nMAC Filtering.................................... Disabled\r\nBroadcast SSID................................... Enabled\r\nRandom MAC Filtering............................. Enabled",
        "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\n2504 Wireless Controllers\r\n3504 Wireless Controllers\r\n5508 Wireless Controllers\r\n5520 Wireless Controllers\r\n8510 Wireless Controllers\r\n8540 Wireless Controllers\r\nFlex 7510 Wireless Controllers\r\nIOS Software\r\nIOS XE Software\r\nIOS XR Software\r\nMeraki products\r\nNX-OS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There is a workaround that addresses this vulnerability. Administrators can disable the Random Mac Filtering feature on the affected device using the following CLI command:\r\n\r\n\r\n3500-3-AX (config-wlan)# no local-admin-mac deny\r\n\r\nWhile this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
        "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 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, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nThe left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.\r\n          Cisco WLC AireOS Software Release  First Fixed Release          8.9 and earlier  Not vulnerable      8.10.101 to 8.10.142.0  Not vulnerable      8.10.150 to 8.10.185  8.10.190.0\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/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 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": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Wireless LAN Controller AireOS Software Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbw-dos-YSmbUqX3"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
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        "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"
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        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Wireless LAN Controller AireOS Software Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2023-09-27T16:00:00+00:00",
      "generator": {
        "date": "2023-10-12T13:22:36+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-cbw-dos-YSmbUqX3",
      "initial_release_date": "2023-09-27T16:00:00+00:00",
      "revision_history": [
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          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "8.10.162.0",
                    "product": {
                      "name": "8.10.162.0",
                      "product_id": "CSAFPID-284587"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.151.0",
                    "product": {
                      "name": "8.10.151.0",
                      "product_id": "CSAFPID-284590"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.171.0",
                    "product": {
                      "name": "8.10.171.0",
                      "product_id": "CSAFPID-289302"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.170.0",
                    "product": {
                      "name": "8.10.170.0",
                      "product_id": "CSAFPID-296624"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.181.0",
                    "product": {
                      "name": "8.10.181.0",
                      "product_id": "CSAFPID-296625"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.182.0",
                    "product": {
                      "name": "8.10.182.0",
                      "product_id": "CSAFPID-296626"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.183.0",
                    "product": {
                      "name": "8.10.183.0",
                      "product_id": "CSAFPID-296627"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "8.10.185.0",
                    "product": {
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                      "product_id": "CSAFPID-296628"
                    }
                  }
                ],
                "category": "product_version",
                "name": "8.10"
              }
            ],
            "category": "product_family",
            "name": "Cisco Wireless LAN Controller (WLC)"
          },
          {
            "category": "product_family",
            "name": "Cisco Wireless LAN Controller (WLC)",
            "product": {
              "name": "Cisco Wireless LAN Controller (WLC) ",
              "product_id": "CSAFPID-7368"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Mobility Express",
            "product": {
              "name": "Cisco Mobility Express ",
              "product_id": "CSAFPID-230258"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Virtual Wireless Controller",
            "product": {
              "name": "Cisco Virtual Wireless Controller",
              "product_id": "CSAFPID-277486"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.162.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-284587:277486"
        },
        "product_reference": "CSAFPID-284587",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.151.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-284590:277486"
        },
        "product_reference": "CSAFPID-284590",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.171.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-289302:277486"
        },
        "product_reference": "CSAFPID-289302",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.170.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-296624:277486"
        },
        "product_reference": "CSAFPID-296624",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.181.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-296625:277486"
        },
        "product_reference": "CSAFPID-296625",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.182.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-296626:277486"
        },
        "product_reference": "CSAFPID-296626",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.183.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-296627:277486"
        },
        "product_reference": "CSAFPID-296627",
        "relates_to_product_reference": "CSAFPID-277486"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Wireless LAN Controller (WLC) 8.10.185.0 when installed on Cisco Virtual Wireless Controller",
          "product_id": "CSAFPID-296628:277486"
        },
        "product_reference": "CSAFPID-296628",
        "relates_to_product_reference": "CSAFPID-277486"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-20251",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwe32125"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-230258",
          "CSAFPID-284587:277486",
          "CSAFPID-284590:277486",
          "CSAFPID-289302:277486",
          "CSAFPID-296624:277486",
          "CSAFPID-296625:277486",
          "CSAFPID-296626:277486",
          "CSAFPID-296627:277486",
          "CSAFPID-296628:277486",
          "CSAFPID-7368"
        ]
      },
      "release_date": "2023-09-27T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-230258",
            "CSAFPID-284587:277486",
            "CSAFPID-284590:277486",
            "CSAFPID-289302:277486",
            "CSAFPID-296624:277486",
            "CSAFPID-296625:277486",
            "CSAFPID-296626:277486",
            "CSAFPID-296627:277486",
            "CSAFPID-296628:277486",
            "CSAFPID-7368"
          ],
          "url": "https://software.cisco.com"
        },
        {
          "category": "workaround",
          "details": "There is a workaround that addresses this vulnerability. Administrators can disable the Random Mac Filtering feature on the affected device using the following CLI command:\r\n\r\n\r\n3500-3-AX (config-wlan)# no local-admin-mac deny\r\n\r\nWhile this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.",
          "product_ids": [
            "CSAFPID-230258",
            "CSAFPID-284587:277486",
            "CSAFPID-284590:277486",
            "CSAFPID-289302:277486",
            "CSAFPID-296624:277486",
            "CSAFPID-296625:277486",
            "CSAFPID-296626:277486",
            "CSAFPID-296627:277486",
            "CSAFPID-296628:277486",
            "CSAFPID-7368"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-230258",
            "CSAFPID-284587:277486",
            "CSAFPID-284590:277486",
            "CSAFPID-289302:277486",
            "CSAFPID-296624:277486",
            "CSAFPID-296625:277486",
            "CSAFPID-296626:277486",
            "CSAFPID-296627:277486",
            "CSAFPID-296628:277486",
            "CSAFPID-7368"
          ]
        }
      ],
      "title": "Cisco Business Wireless Access Points Denial of Service Vulnerability"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • 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.