{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Cisco Internetwork Operating System (IOS) ist ein Betriebssystem, das f\u00fcr Cisco Ger\u00e4te wie z. B. Router und Switches eingesetzt wird.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Cisco IOS XR ausnutzen, um beliebigen Code auszuf\u00fchren, Sicherheitsma\u00dfnahmen zu umgehen oder einen Denial-of-Service-Zustand zu verursachen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- CISCO Appliance",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2023-2355 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2023/wid-sec-w-2023-2355.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2023-2355 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2023-2355"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories vom 2023-09-13",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories vom 2023-09-13",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories vom 2023-09-13",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-xr-cfm-3pWN8MKt"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories vom 2023-09-13",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-dnx-acl-PyzDkeYF"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories vom 2023-09-13",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-comp3acl-vGmp6BQ3"
      }
    ],
    "source_lang": "en-US",
    "title": "Cisco IOS XR: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2023-09-13T22:00:00.000+00:00",
      "generator": {
        "date": "2024-02-15T17:44:08.435+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.0"
        }
      },
      "id": "WID-SEC-W-2023-2355",
      "initial_release_date": "2023-09-13T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2023-09-13T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.10.1",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.10.1",
                  "product_id": "T029881",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.10.1"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.3.5",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.3.5",
                  "product_id": "T029882",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.3.5"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.5.4",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.5.4",
                  "product_id": "T029883",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.5.4"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.6.3",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.6.3",
                  "product_id": "T029884",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.6.3"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.7.21",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.7.21",
                  "product_id": "T029885",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.7.21"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.8.2",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.8.2",
                  "product_id": "T029886",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.8.2"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.9.1",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.9.1",
                  "product_id": "T029887",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.9.1"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "Cisco IOS XR \u003c 7.9.2",
                "product": {
                  "name": "Cisco IOS XR \u003c 7.9.2",
                  "product_id": "T029888",
                  "product_identification_helper": {
                    "cpe": "cpe:/o:cisco:ios_xr:7.9.2"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "IOS XR"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-20236",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Cisco IOS XR. Dieser Fehler besteht in der iPXE-Boot-Funktion der XR-Software aufgrund einer unzureichenden Image-Verifizierung, die das Booten eines nicht verifizierten Software-Images erm\u00f6glicht. Durch Manipulation der Boot-Parameter f\u00fcr die Image-Verifizierung w\u00e4hrend des iPXE-Boot-Prozesses kann ein lokaler Angreifer diese Schwachstelle ausnutzen, um Sicherheitsma\u00dfnahmen zu umgehen."
        }
      ],
      "release_date": "2023-09-13T22:00:00Z",
      "title": "CVE-2023-20236"
    },
    {
      "cve": "CVE-2023-20233",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Cisco IOS XR. Dieser Fehler besteht in der Funktion \"Connectivity Fault Management\" (CFM) der XR-Software aufgrund einer fehlerhaften Verarbeitung von ung\u00fcltigen Continuity-Check-Meldungen. Ein entfernter Angreifer kann diese Schwachstelle ausnutzen, um einen Denial-of-Service-Zustand zu verursachen. Eine erfolgreiche Ausnutzung erfordert eine Benutzerinteraktion."
        }
      ],
      "release_date": "2023-09-13T22:00:00Z",
      "title": "CVE-2023-20233"
    },
    {
      "cve": "CVE-2023-20191",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Cisco IOS XR. Dieser Fehler besteht in der Zugriffskontrolllisten (ACL)-Verarbeitung auf MPLS-Schnittstellen in der Ingress-Richtung der XR-Software aufgrund einer unvollst\u00e4ndigen Unterst\u00fctzung f\u00fcr diese Funktion. Ein entfernter Angreifer kann diese Schwachstelle ausnutzen, um Sicherheitsma\u00dfnahmen zu umgehen."
        }
      ],
      "release_date": "2023-09-13T22:00:00Z",
      "title": "CVE-2023-20191"
    },
    {
      "cve": "CVE-2023-20190",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Cisco IOS XR. Dieser Fehler besteht in der klassischen ACL-Komprimierungsfunktion (Access Control List) der XR-Software aufgrund eines falschen Zieladressbereichs. Ein Angreifer kann diese Schwachstelle ausnutzen, um Sicherheitsma\u00dfnahmen zu umgehen, indem er Datenverkehr durch das betroffene Ger\u00e4t sendet, der durch die konfigurierte ACL verweigert werden sollte."
        }
      ],
      "release_date": "2023-09-13T22:00:00Z",
      "title": "CVE-2023-20190"
    },
    {
      "cve": "CVE-2023-20135",
      "notes": [
        {
          "category": "description",
          "text": "Es besteht eine Schwachstelle in Cisco IOS XR. Dieser Fehler besteht in der XR Software Image Verification aufgrund einer Time-of-Check, Time-of-Use (TOCTOU) Race Condition. Ein lokaler Angreifer kann diese Schwachstelle zur Ausf\u00fchrung von beliebigem Code ausnutzen."
        }
      ],
      "release_date": "2023-09-13T22:00:00Z",
      "title": "CVE-2023-20135"
    }
  ]
}

{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\r\n\r\nThis vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75241\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, these vulnerabilities affected the following Cisco devices if they were running a vulnerable release of Cisco IOS XR Software:\r\n\r\n8000 Series Routers\r\nNetwork Convergence System (NCS) 540 Series Routers that are running the NCS540L images\r\nNetwork Convergence System (NCS) 5700 Series Routers that are running the NCS5700 images (NCS-57B1-5DSE-SYS, NCS-57B1-6D24-SYS and NCS-57C1-48Q6-SYS)\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 the Software Release\r\n\r\nTo determine whether the device is running an affected software image, use the show version command in the device CLI. If the output indicates LNT, as shown in the following example, then the device is affected by this vulnerability:\r\n\r\n\r\nRouter#show version\r\nCisco IOS XR Software, Version 7.5.2 LNT\r\nCopyright (c) 2013-2022 by Cisco Systems, Inc.",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that these vulnerabilities do not affect the following Cisco products:\r\n\r\nIOS Software\r\nIOS XE Software\r\nNX-OS Software",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "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 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(s) 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 IOS XR Release  First Fixed Release          Earlier than 7.5.2  Not affected.      7.5.2 and later  Migrate to a fixed release.      7.6 and later  Not affected.      7.7 and later  7.10.1\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 internal security testing.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco IOS XR Software Image Verification Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75241"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Vulnerable Products",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn#vp"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco IOS XR Software Image Verification Vulnerability",
    "tracking": {
      "current_release_date": "2023-09-13T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:26:36+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-lnt-L9zOkBz5",
      "initial_release_date": "2023-09-13T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2023-09-13T15:47:31+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 IOS XR Software",
            "product": {
              "name": "Cisco IOS XR Software ",
              "product_id": "CSAFPID-5834"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-20135",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwd87928"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-5834"
        ]
      },
      "release_date": "2023-09-13T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-5834"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-5834"
          ]
        }
      ],
      "title": "Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Image Verification Vulnerability"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2023-20135"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347",
      "CWE-367"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-09-13T17:15:09Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\n\n This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.",
  "id": "GHSA-6v48-qpg5-fj4m",
  "modified": "2024-01-25T18:30:43Z",
  "published": "2023-09-13T18:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-20135"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "GSD": {
    "alias": "CVE-2023-20135",
    "id": "GSD-2023-20135"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-20135"
      ],
      "details": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\r\n\r This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.",
      "id": "GSD-2023-20135",
      "modified": "2023-12-13T01:20:28.354444Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "psirt@cisco.com",
        "ID": "CVE-2023-20135",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Cisco IOS XR Software",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "7.5.3"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.5.2"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.5.4"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.7.1"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.7.2"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.7.21"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.8.1"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.8.2"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.9.1"
                        },
                        {
                          "version_affected": "=",
                          "version_value": "7.9.2"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Cisco"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\r\n\r This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device."
          }
        ]
      },
      "exploit": [
        {
          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "impact": {
        "cvss": [
          {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-347",
                "lang": "eng",
                "value": "Improper Verification of Cryptographic Signature"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5",
            "refsource": "MISC",
            "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5"
          }
        ]
      },
      "source": {
        "advisory": "cisco-sa-lnt-L9zOkBz5",
        "defects": [
          "CSCwd87928"
        ],
        "discovery": "INTERNAL"
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "93148C76-2970-48D4-942A-D67B68352EA9",
                    "versionEndExcluding": "7.6",
                    "versionStartIncluding": "7.5.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "75317BEF-7612-49E8-A4B2-9C90AADE3BB0",
                    "versionEndExcluding": "7.10.1",
                    "versionStartIncluding": "7.7",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "descriptions": [
          {
            "lang": "en",
            "value": "A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system.\r\n\r This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device."
          },
          {
            "lang": "es",
            "value": "Una vulnerabilidad en las comprobaciones de verificaci\u00f3n de im\u00e1genes del Software Cisco IOS XR podr\u00eda permitir que un atacante local autenticado ejecute c\u00f3digo arbitrario en el sistema operativo subyacente. Esta vulnerabilidad se debe a una condici\u00f3n de ejecuci\u00f3n de tiempo de verificaci\u00f3n, tiempo de uso (TOCTOU) cuando se realiza una consulta de instalaci\u00f3n relacionada con una imagen ISO durante una operaci\u00f3n de instalaci\u00f3n que utiliza una imagen ISO. Un atacante podr\u00eda aprovechar esta vulnerabilidad modificando una imagen ISO y luego realizando solicitudes de instalaci\u00f3n en paralelo. Una explotaci\u00f3n existosa podr\u00eda permitir al atacante ejecutar c\u00f3digo arbitrario en un dispositivo afectado."
          }
        ],
        "id": "CVE-2023-20135",
        "lastModified": "2024-01-25T17:15:31.443",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.0,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "NONE",
                "baseScore": 5.7,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "HIGH",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 0.5,
              "impactScore": 5.2,
              "source": "ykramarz@cisco.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2023-09-13T17:15:09.253",
        "references": [
          {
            "source": "ykramarz@cisco.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-L9zOkBz5"
          }
        ],
        "sourceIdentifier": "ykramarz@cisco.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-367"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-347"
              }
            ],
            "source": "ykramarz@cisco.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}