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ID

VAR-202110-1148


CVE

CVE-2021-34862


TITLE

D-Link DAP-2020  Stack-based buffer overflow vulnerability in routers

Trust: 0.8

sources: JVNDB: JVNDB-2021-014127

DESCRIPTION

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the var:menu parameter provided to the webproc endpoint. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-13270. D-Link DAP-2020 A stack-based buffer overflow vulnerability exists in the router. Zero Day Initiative To this vulnerability ZDI-CAN-13270 Was numbering.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be in a state. D-Link DAP-2020 is a wireless N access point

Trust: 2.88

sources: NVD: CVE-2021-34862 // JVNDB: JVNDB-2021-014127 // ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // VULMON: CVE-2021-34862

IOT TAXONOMY

category:['Network device']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2021-67523

AFFECTED PRODUCTS

vendor:d linkmodel:dap-2020scope: - version: -

Trust: 1.5

vendor:dlinkmodel:dap-2020scope:lteversion:1.01

Trust: 1.0

vendor:d linkmodel:dap-2020scope:eqversion: -

Trust: 0.8

vendor:d linkmodel:dap-2020scope:eqversion:dap-2020 firmware

Trust: 0.8

vendor:d linkmodel:dap-2020scope:lteversion:<=1.01

Trust: 0.6

sources: ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // JVNDB: JVNDB-2021-014127 // NVD: CVE-2021-34862

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2021-34862
value: HIGH

Trust: 1.0

zdi-disclosures@trendmicro.com: CVE-2021-34862
value: HIGH

Trust: 1.0

NVD: CVE-2021-34862
value: HIGH

Trust: 0.8

ZDI: CVE-2021-34862
value: HIGH

Trust: 0.7

CNVD: CNVD-2021-67523
value: HIGH

Trust: 0.6

CNNVD: CNNVD-202108-1618
value: HIGH

Trust: 0.6

nvd@nist.gov: CVE-2021-34862
severity: MEDIUM
baseScore: 5.8
vectorString: AV:A/AC:L/AU:N/C:P/I:P/A:P
accessVector: ADJACENT_NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: PARTIAL
integrityImpact: PARTIAL
availabilityImpact: PARTIAL
exploitabilityScore: 6.5
impactScore: 6.4
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.8

CNVD: CNVD-2021-67523
severity: HIGH
baseScore: 8.3
vectorString: AV:A/AC:L/AU:N/C:C/I:C/A:C
accessVector: ADJACENT_NETWORK
accessComplexity: LOW
authentication: NONE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 6.5
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

zdi-disclosures@trendmicro.com: CVE-2021-34862
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: ADJACENT
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.0

Trust: 1.8

nvd@nist.gov: CVE-2021-34862
baseSeverity: HIGH
baseScore: 8.8
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: ADJACENT
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.1

Trust: 1.0

ZDI: CVE-2021-34862
baseSeverity: HIGH
baseScore: 8.8
vectorString: AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: ADJACENT
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.8
impactScore: 5.9
version: 3.0

Trust: 0.7

sources: ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // JVNDB: JVNDB-2021-014127 // CNNVD: CNNVD-202108-1618 // NVD: CVE-2021-34862 // NVD: CVE-2021-34862

PROBLEMTYPE DATA

problemtype:CWE-121

Trust: 1.0

problemtype:Stack-based buffer overflow (CWE-121) [ others ]

Trust: 0.8

sources: JVNDB: JVNDB-2021-014127 // NVD: CVE-2021-34862

THREAT TYPE

remote or local

Trust: 0.6

sources: CNNVD: CNNVD-202108-1618

TYPE

other

Trust: 0.6

sources: CNNVD: CNNVD-202108-1618

PATCH

title:Multiple Vulnerabilityurl:https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201

Trust: 1.5

title:Patch for D-Link DAP-2020 stack buffer overflow vulnerability (CNVD-2021-67523)url:https://www.cnvd.org.cn/patchInfo/show/288991

Trust: 0.6

title:D-Link DAP-2020 Security vulnerabilitiesurl:http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=160427

Trust: 0.6

sources: ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // JVNDB: JVNDB-2021-014127 // CNNVD: CNNVD-202108-1618

EXTERNAL IDS

db:NVDid:CVE-2021-34862

Trust: 4.6

db:ZDIid:ZDI-21-978

Trust: 3.8

db:DLINKid:SAP10201

Trust: 1.6

db:JVNDBid:JVNDB-2021-014127

Trust: 0.8

db:ZDI_CANid:ZDI-CAN-13270

Trust: 0.7

db:CNVDid:CNVD-2021-67523

Trust: 0.6

db:CS-HELPid:SB2021100105

Trust: 0.6

db:CNNVDid:CNNVD-202108-1618

Trust: 0.6

db:VULMONid:CVE-2021-34862

Trust: 0.1

sources: ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // VULMON: CVE-2021-34862 // JVNDB: JVNDB-2021-014127 // CNNVD: CNNVD-202108-1618 // NVD: CVE-2021-34862

REFERENCES

url:https://www.zerodayinitiative.com/advisories/zdi-21-978/

Trust: 3.7

url:https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=sap10201

Trust: 2.3

url:https://nvd.nist.gov/vuln/detail/cve-2021-34862

Trust: 0.8

url:https://www.cybersecurity-help.cz/vdb/sb2021100105

Trust: 0.6

sources: ZDI: ZDI-21-978 // CNVD: CNVD-2021-67523 // VULMON: CVE-2021-34862 // JVNDB: JVNDB-2021-014127 // CNNVD: CNNVD-202108-1618 // NVD: CVE-2021-34862

CREDITS

chung96vn & Quang Nguyen (aka sovietw0rm) of Vietnam National Cyber Security Center (NCSC Vietnam)

Trust: 0.7

sources: ZDI: ZDI-21-978

SOURCES

db:ZDIid:ZDI-21-978
db:CNVDid:CNVD-2021-67523
db:VULMONid:CVE-2021-34862
db:JVNDBid:JVNDB-2021-014127
db:CNNVDid:CNNVD-202108-1618
db:NVDid:CVE-2021-34862

LAST UPDATE DATE

2024-08-14T14:18:20.185000+00:00


SOURCES UPDATE DATE

db:ZDIid:ZDI-21-978date:2021-12-22T00:00:00
db:CNVDid:CNVD-2021-67523date:2021-09-02T00:00:00
db:JVNDBid:JVNDB-2021-014127date:2022-10-05T05:50:00
db:CNNVDid:CNNVD-202108-1618date:2021-10-28T00:00:00
db:NVDid:CVE-2021-34862date:2023-04-26T19:27:52.350

SOURCES RELEASE DATE

db:ZDIid:ZDI-21-978date:2021-12-22T00:00:00
db:CNVDid:CNVD-2021-67523date:2021-09-02T00:00:00
db:JVNDBid:JVNDB-2021-014127date:2022-10-05T00:00:00
db:CNNVDid:CNNVD-202108-1618date:2021-08-18T00:00:00
db:NVDid:CVE-2021-34862date:2021-10-25T17:15:08.537