CVE-2021-34862

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.

CVSS v3.0 8.8 HIGH
CVSS v2.0 5.8 MEDIUM

8.8^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

5.8^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 6.5 / Impact : 6.4

Access Vector ADJACENT_NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201	Patch Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-978/	Third Party Advisory VDB Entry

Advertisement

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:d-link:dap-2020_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:d-link:dap-2020:*:*:*:*:*:*:*:*

Information

Published : 2021-10-25 10:15

Updated : 2021-10-27 09:24

NVD link : CVE-2021-34862

Mitre link : CVE-2021-34862

JSON object : View

CWE

CWE-121

Stack-based Buffer Overflow

Advertisement

Products Affected

d-link

dap-2020_firmware
dap-2020

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201", "name": "N/A", "tags": ["Patch", "Vendor Advisory"], "refsource": "N/A"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-978/", "name": "N/A", "tags": ["Third Party Advisory", "VDB Entry"], "refsource": "N/A"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-121"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-34862", "ASSIGNER": "zdi-disclosures@trendmicro.com"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 5.8, "accessVector": "ADJACENT_NETWORK", "vectorString": "AV:A/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "severity": "MEDIUM", "acInsufInfo": false, "impactScore": 6.4, "obtainAllPrivilege": false, "exploitabilityScore": 6.5, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/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": 2.8}}, "publishedDate": "2021-10-25T17:15Z", "configurations": {"nodes": [{"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:d-link:dap-2020_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "1.01"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:d-link:dap-2020:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2021-10-27T16:24Z"}