CVE-2021-27707

Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"portMappingIndex "request. This occurs because the "formDelPortMapping" function directly passes the parameter "portMappingIndex" to strcpy without limit.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

V2 Legend

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

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw	Exploit Third Party Advisory
https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:tenda:g1_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:*

cpe:2.3:h:tenda:g1:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:tenda:g3_firmware:v15.11.0.17\(9502\)_cn:*:*:*:*:*:*:*

cpe:2.3:h:tenda:g3:-:*:*:*:*:*:*:*

History

21 Nov 2024, 05:58

Type	Values Removed	Values Added
References	~~() https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw - Exploit, Third Party Advisory~~	() https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw - Exploit, Third Party Advisory

Information

Published : 2021-04-14 15:15

Updated : 2024-11-21 05:58

NVD link : CVE-2021-27707

Mitre link : CVE-2021-27707

CVE.ORG link : CVE-2021-27707

JSON object : View

Products Affected

tenda

g1_firmware
g1
g3_firmware
g3

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

{"id": "CVE-2021-27707", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "HIGH", "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": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2021-04-14T15:15:14.440", "references": [{"url": "https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-120"}]}], "descriptions": [{"lang": "en", "value": "Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"portMappingIndex \"request. This occurs because the \"formDelPortMapping\" function directly passes the parameter \"portMappingIndex\" to strcpy without limit."}, {"lang": "es", "value": "Un desbordamiento de b\u00fafer en los enrutadores Tenda versiones G1 y G3 con firmware v15.11.0.17(9502) _CN, permite a atacantes remotos ejecutar c\u00f3digo arbitrario por medio de una petici\u00f3n dise\u00f1ada action/\"portMappingIndex\". Esto ocurre porque la funci\u00f3n \"formDelPortMapping\" pasa directamente el par\u00e1metro \"portMappingIndex\" a strcpy sin l\u00edmite"}], "lastModified": "2024-11-21T05:58:27.853", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:tenda:g1_firmware:v15.11.0.17\\(9502\\)_cn:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "98669DBF-D56B-4E2D-9A12-813CEC185170"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:tenda:g1:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "FD313047-8A0F-44BD-A75B-F4CF2F4DD8F6"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:tenda:g3_firmware:v15.11.0.17\\(9502\\)_cn:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "01254E20-AFFD-4A1A-A956-36BFD85017D4"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:tenda:g3:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "7A1B3B7C-2164-40B6-959A-188796737C16"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}

9.8 /10