CVE-2021-27173

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:fiberhome:hg6245d_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:fiberhome:hg6245d:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2021-02-10 19:15

Updated : 2024-02-28 18:08

NVD link : CVE-2021-27173

Mitre link : CVE-2021-27173

CVE.ORG link : CVE-2021-27173

JSON object : View

Products Affected

fiberhome

hg6245d_firmware
hg6245d

CWE

NVD-CWE-Other

{"id": "CVE-2021-27173", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2021-02-10T19:15:15.183", "references": [{"url": "https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI)."}, {"lang": "es", "value": "Se detect\u00f3 un problema en los dispositivos FiberHome HG6245D versiones hasta RP2613. Se presenta una API backdoor de telnet?enable=0&key=calculated(BR0_MAC), sin autenticaci\u00f3n, proporcionada por el servidor HTTP. Esto eliminar\u00e1 las reglas del firewall y permitir\u00e1 a un atacante llegar al servidor telnet (usado para la CLI)"}], "lastModified": "2022-07-12T17:42:04.277", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fiberhome:hg6245d_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "584691EE-5328-499D-92DE-F79505905C9C", "versionEndIncluding": "rp2613"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:fiberhome:hg6245d:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "26C22EE9-62CD-4111-AD9E-84748BD774FC"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}