fkie_cve-2019-15803
Vulnerability from fkie_nvd
Published
2019-11-14 21:15
Modified
2024-11-21 04:29
Severity ?
9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fds_sys_passDebugPasswd_ret(). The firmware contains access control checks that determine if remote users are allowed to access this functionality. The function that performs this check (fds_sys_remoteDebugEnable_ret in libfds.so) always return TRUE with no actual checks performed. The diagnostics menu allows for reading/writing arbitrary registers and various other configuration parameters which are believed to be related to the network interface chips.
References
cve@mitre.orghttps://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlExploit, Third Party Advisory
cve@mitre.orghttps://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.htmlExploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtmlVendor Advisory
Impacted products
Vendor Product Version
zyxel gs1900-8_firmware *
zyxel gs1900-8 -
zyxel gs1900-8hp_firmware *
zyxel gs1900-8hp -
zyxel gs1900-10hp_firmware *
zyxel gs1900-10hp -
zyxel gs1900-16_firmware *
zyxel gs1900-16 -
zyxel gs1900-24e_firmware *
zyxel gs1900-24e -
zyxel gs1900-24_firmware *
zyxel gs1900-24 -
zyxel gs1900-24hp_firmware *
zyxel gs1900-24hp -
zyxel gs1900-48_firmware *
zyxel gs1900-48 -
zyxel gs1900-48hp_firmware *
zyxel gs1900-48hp -


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B5428A26-563D-47A7-A771-D6F20775EDF5",
              "versionEndExcluding": "2.50\\(aahh.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "51D33F50-B5A4-4AEF-972C-7FF089C21D52",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0E6DB241-5659-414E-856E-C5D790D07F8B",
              "versionEndExcluding": "2.50\\(aahi.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "27602862-EFB7-402B-994E-254A0B210820",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "21D9999F-C55E-4BAB-A401-007FB34B2A5E",
              "versionEndExcluding": "2.50\\(aazi.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "89201505-07AF-4F9C-9304-46F2707DB9B4",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "52D51F8F-8BCB-4571-A782-264B71C7CD76",
              "versionEndExcluding": "2.50\\(aahj.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "5078F7A5-D03B-4D3A-9C19-57DFF4D6BF7A",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3687A400-9D7F-453A-88D7-C87B85B6E4EB",
              "versionEndExcluding": "2.50\\(aahk.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A6456AD6-8A1D-4D3D-AC1A-ABE442242B1B",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6733BECF-F9A3-4748-8A96-DFB10A670C35",
              "versionEndExcluding": "2.50\\(aahl.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "F4F55299-70D5-4CE1-A1EC-D79B469B94F7",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5D3A3C5E-2027-40EE-A9EF-983474E9DC07",
              "versionEndExcluding": "2.50\\(aahm.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-24hp:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "74B1D264-99AC-4AA8-955C-602F2DA5B885",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "45D88D78-F7C9-45BB-8E47-2BD24B8616B2",
              "versionEndExcluding": "2.50\\(aahn.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "CFB7D4BF-7D17-48D3-990D-4BADAC8BD868",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C6EA6D9E-B5D4-4043-90C5-409B5875A3B5",
              "versionEndExcluding": "2.50\\(aaho.0\\)c0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        },
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:zyxel:gs1900-48hp:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "566A9E8C-AF55-4331-B9B0-F65EB900B0BE",
              "vulnerable": false
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Through an undocumented sequence of keypresses, undocumented functionality is triggered. A diagnostics shell is triggered via CTRL-ALT-t, which prompts for the password returned by fds_sys_passDebugPasswd_ret(). The firmware contains access control checks that determine if remote users are allowed to access this functionality. The function that performs this check (fds_sys_remoteDebugEnable_ret in libfds.so) always return TRUE with no actual checks performed. The diagnostics menu allows for reading/writing arbitrary registers and various other configuration parameters which are believed to be related to the network interface chips."
    },
    {
      "lang": "es",
      "value": "Se descubri\u00f3 un problema en los dispositivos Zyxel GS1900 con firmware anterior a la versi\u00f3n  2.50 (AAHH.0) C0. A trav\u00e9s de una secuencia indocumentada de pulsaciones de teclas, se activa la funcionalidad no documentada. Se activa un shell de diagn\u00f3stico a trav\u00e9s de CTRL-ALT-t, que solicita la contrase\u00f1a devuelta por fds_sys_passDebugPasswd_ret (). El firmware contiene comprobaciones de control de acceso que determinan si los usuarios remotos pueden acceder a esta funcionalidad. La funci\u00f3n que realiza esta comprobaci\u00f3n (fds_sys_remoteDebugEnable_ret en libfds.so) siempre devuelve VERDADERO sin realizar comprobaciones reales. El men\u00fa de diagn\u00f3stico permite leer / escribir registros arbitrarios y varios otros par\u00e1metros de configuraci\u00f3n que se cree que est\u00e1n relacionados con los chips de la interfaz de red."
    }
  ],
  "id": "CVE-2019-15803",
  "lastModified": "2024-11-21T04:29:29.943",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 6.4,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2019-11-14T21:15:11.890",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.