cve-2023-20198
Vulnerability from cvelistv5
Published
2023-10-16 15:12
Modified
2024-10-23 18:58
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Summary
Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.
References
ykramarz@cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4zMitigation, Vendor Advisory
Impacted products
CiscoCisco IOS XE Software
CISA Known exploited vulnerability
Data from the Known Exploited Vulnerabilities Catalog

Date added: 2023-10-16

Due date: 2023-10-20

Required action: Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.

Used in ransomware: Unknown

Notes: https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-xe-dublin-17121/221128-software-fix-availability-for-cisco-ios.html; https://nvd.nist.gov/vuln/detail/CVE-2023-20198

Show details on NVD website

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          "value": "Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343."
        }
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            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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      "providerMetadata": {
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
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          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z"
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        "defects": [
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        "discovery": "EXTERNAL"
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    "dateReserved": "2022-10-27T18:47:50.365Z",
    "dateUpdated": "2024-10-23T18:58:22.360Z",
    "state": "PUBLISHED"
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      "dueDate": "2023-10-20",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-xe-dublin-17121/221128-software-fix-availability-for-cisco-ios.html;  https://nvd.nist.gov/vuln/detail/CVE-2023-20198",
      "product": "IOS XE Web UI",
      "requiredAction": "Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.",
      "shortDescription": "Cisco IOS XE Web UI contains a privilege escalation vulnerability in the web user interface that could allow a remote, unauthenticated attacker to create an account with privilege level 15 access. The attacker can then use that account to gain control of the affected device.",
      "vendorProject": "Cisco",
      "vulnerabilityName": "Cisco IOS XE Web UI Privilege Escalation Vulnerability"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-20198\",\"sourceIdentifier\":\"ykramarz@cisco.com\",\"published\":\"2023-10-16T16:15:10.023\",\"lastModified\":\"2024-06-17T13:31:44.957\",\"vulnStatus\":\"Analyzed\",\"cisaExploitAdd\":\"2023-10-16\",\"cisaActionDue\":\"2023-10-20\",\"cisaRequiredAction\":\"Verify that instances of Cisco IOS XE Web UI are in compliance with BOD 23-02 and apply mitigations per vendor instructions. For affected products (Cisco IOS XE Web UI exposed to the internet or to untrusted networks), follow vendor instructions to determine if a system may have been compromised and immediately report positive findings to CISA.\",\"cisaVulnerabilityName\":\"Cisco IOS XE Web UI Privilege Escalation Vulnerability\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"Cisco is providing an update for the ongoing investigation into observed exploitation of the web UI feature in Cisco IOS XE Software. We are updating the list of fixed releases and adding the Software Checker. Our investigation has determined that the actors exploited two previously unknown issues. The attacker first exploited CVE-2023-20198 to gain initial access and issued a privilege 15 command to create a local user and password combination. This allowed the user to log in with normal user access. The attacker then exploited another component of the web UI feature, leveraging the new local user to elevate privilege to root and write the implant to the file system. Cisco has assigned CVE-2023-20273 to this issue. CVE-2023-20198 has been assigned a CVSS Score of 10.0. CVE-2023-20273 has been assigned a CVSS Score of 7.2. Both of these CVEs are being tracked by CSCwh87343.\"},{\"lang\":\"es\",\"value\":\"Cisco tiene conocimiento de la explotaci\u00f3n activa de una vulnerabilidad previamente desconocida en la funci\u00f3n de interfaz de usuario web del software Cisco IOS XE cuando se expone a Internet o a redes que no son de confianza. Esta vulnerabilidad permite a un atacante remoto no autenticado crear una cuenta en un sistema afectado con acceso de nivel de privilegio 15. Luego, el atacante puede usar esa cuenta para hacerse con el control del sistema afectado. Para conocer los pasos para cerrar el vector de ataque de esta vulnerabilidad, consulte la secci\u00f3n Recomendaciones de este aviso. Cisco proporcionar\u00e1 actualizaciones sobre el estado de esta investigaci\u00f3n y cu\u00e1ndo estar\u00e1 disponible un parche de software.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\",\"baseScore\":10.0,\"baseSeverity\":\"CRITICAL\"},\"exploitabilityScore\":3.9,\"impactScore\":6.0},{\"source\":\"ykramarz@cisco.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\",\"baseScore\":10.0,\"baseSeverity\":\"CRITICAL\"},\"exploitabilityScore\":3.9,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]},{\"source\":\"ykramarz@cisco.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-420\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"16.12\",\"versionEndExcluding\":\"16.12.10a\",\"matchCriteriaId\":\"2C8A350D-6C3A-430F-9763-5D167C5CEAE5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.3\",\"versionEndExcluding\":\"17.3.8a\",\"matchCriteriaId\":\"BEA2169A-BE52-48B4-8967-D99A4BCAFF58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.6\",\"versionEndExcluding\":\"17.6.6a\",\"matchCriteriaId\":\"281561C8-E24D-4AC1-B1F8-1D32171B9A2F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"17.9\",\"versionEndExcluding\":\"17.9.4a\",\"matchCriteriaId\":\"B628DA7F-32AA-459B-95A6-AF3BFC0E765C\"}]}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-webui-privesc-j22SaA4z\",\"source\":\"ykramarz@cisco.com\",\"tags\":[\"Mitigation\",\"Vendor Advisory\"]}]}}"
  }
}


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