{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2023-0811",
        "ASSIGNER": "ics-cert@hq.dhs.gov",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. This may lead to disabling UM protections or setting a non-ASCII password (non-keyboard characters) and preventing an engineer from viewing or modifying the user program."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-284 Improper Access Control ",
                        "cweId": "CWE-284"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Omron ",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "CJ1M SYSMAC CJ-series",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "CJ1M SYSMAC CS-series ",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                },
                {
                    "vendor_name": "Omron",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "CJ1M SYSMAC CJ-series",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "CJ1M SYSMAC CS-series ",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        }
                                    ]
                                }
                            },
                            {
                                "product_name": "CJ1M SYSMAC CP-series",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        },
                                        {
                                            "version_affected": "=",
                                            "version_value": "All versions "
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01",
                "refsource": "MISC",
                "name": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-073-01"
            },
            {
                "url": "https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf",
                "refsource": "MISC",
                "name": "https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf"
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.1.0-dev"
    },
    "source": {
        "discovery": "UNKNOWN"
    },
    "work_around": [
        {
            "lang": "en",
            "supportingMedia": [
                {
                    "base64": false,
                    "type": "text/html",
                    "value": "\n\n<p>OMRON has released the following countermeasures for users to implement: </p><ul><li>Enable the hardware switch to prohibit writing UM (DIP switch on front panel of the CPU Unit) </li><li>Set UM read protection password and \u201cProhibit from overwriting to a protected program \u201coption. </li></ul><p>If the countermeasures cannot be applied, OMRON recommends that customers take the following mitigation measures: </p><p>Security measures to prevent unauthorized access: </p><ul><li>If the following products and versions are used, the risk of attacks by an attacker via the network can be reduced by taking the following measures. <ul><li>Enable the FINS write protection function. </li><li>Select the Protect by IP Address </li></ul></li><li>Minimize connection of control systems and equipment to open networks, so that untrusted devices will be unable to access them. &nbsp;</li><li>Implement firewalls (by shutting down unused communications ports, limiting communications hosts, limiting access to FINS port (9600)) and isolate them from the IT network. </li><li>Use a virtual private network (VPN) for remote access to control systems and equipment. </li><li>Use strong passwords and change them frequently. </li><li>Install physical controls so that only authorized personnel can access control systems and equipment. </li><li>Scan virus to ensure safety of any USB drives or similar devices before connecting them to systems and devices. </li><li>Enforce multifactor authentication to all devices with remote access to control systems and equipment whenever possible. </li><li>Anti-virus protection <ul><li>Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection. </li></ul></li><li>Data input and output protection <ul><li>Validation processing such as backup and range check to cope with unintentional modification of input/output data to control systems and devices. </li></ul></li><li>Data recovery <ul><li>Periodical data backup and maintenance to prepare for data loss. </li></ul></li></ul><p>For more information, see Omron\u2019s <a target=\"_blank\" rel=\"nofollow\" href=\"https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf\">Security Advisory</a>.</p><br>\n\n<br>"
                }
            ],
            "value": "\nOMRON has released the following countermeasures for users to implement: \n\n  *  Enable the hardware switch to prohibit writing UM (DIP switch on front panel of the CPU Unit) \n  *  Set UM read protection password and \u201cProhibit from overwriting to a protected program \u201coption. \n\n\nIf the countermeasures cannot be applied, OMRON recommends that customers take the following mitigation measures: \n\nSecurity measures to prevent unauthorized access: \n\n  *  If the following products and versions are used, the risk of attacks by an attacker via the network can be reduced by taking the following measures.   *  Enable the FINS write protection function. \n  *  Select the Protect by IP Address \n\n\n\n  *  Minimize connection of control systems and equipment to open networks, so that untrusted devices will be unable to access them. \u00a0\n  *  Implement firewalls (by shutting down unused communications ports, limiting communications hosts, limiting access to FINS port (9600)) and isolate them from the IT network. \n  *  Use a virtual private network (VPN) for remote access to control systems and equipment. \n  *  Use strong passwords and change them frequently. \n  *  Install physical controls so that only authorized personnel can access control systems and equipment. \n  *  Scan virus to ensure safety of any USB drives or similar devices before connecting them to systems and devices. \n  *  Enforce multifactor authentication to all devices with remote access to control systems and equipment whenever possible. \n  *  Anti-virus protection   *  Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection. \n\n\n\n  *  Data input and output protection   *  Validation processing such as backup and range check to cope with unintentional modification of input/output data to control systems and devices. \n\n\n\n  *  Data recovery   *  Periodical data backup and maintenance to prepare for data loss. \n\n\n\n\n\nFor more information, see Omron\u2019s  Security Advisory https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf .\n\n\n\n\n\n"
        }
    ],
    "credits": [
        {
            "lang": "en",
            "value": "Sam Hanson of Dragos reported these vulnerabilities to CISA. "
        }
    ],
    "impact": {
        "cvss": [
            {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                "version": "3.1"
            }
        ]
    }
}