CVE-2020-25857

The function ClientEAPOLKeyRecvd() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an rtl_memcpy() operation, resulting in a stack buffer overflow which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK.

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 NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/	Exploit Third Party Advisory
https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:realtek:rtl8195a_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:realtek:rtl8195a:-:*:*:*:*:*:*:*

History

21 Nov 2024, 05:18

Type	Values Removed	Values Added
References	~~() https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ - Exploit, Third Party Advisory~~	() https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ - Exploit, Third Party Advisory

Information

Published : 2021-02-03 17:15

Updated : 2024-11-21 05:18

NVD link : CVE-2020-25857

Mitre link : CVE-2020-25857

CVE.ORG link : CVE-2020-25857

JSON object : View

Products Affected

realtek

rtl8195a
rtl8195a_firmware

CWE

CWE-121

Stack-based Buffer Overflow

CWE-787

Out-of-bounds Write

{"id": "CVE-2020-25857", "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:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "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:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2021-02-03T17:15:15.747", "references": [{"url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/", "tags": ["Exploit", "Third Party Advisory"], "source": "vuln@vdoo.com"}, {"url": "https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/", "tags": ["Exploit", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "vuln@vdoo.com", "description": [{"lang": "en", "value": "CWE-121"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "The function ClientEAPOLKeyRecvd() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an rtl_memcpy() operation, resulting in a stack buffer overflow which can be exploited for denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker does not need to know the network's PSK."}, {"lang": "es", "value": "La funci\u00f3n ClientEAPOLKeyRecvd() en el m\u00f3dulo Wi-Fi Realtek RTL8195A anterior a versiones publicadas en Abril de 2020 (hasta y excluyendo la 2.08), no comprueba el par\u00e1metro size para una operaci\u00f3n rtl_memcpy(), resultando en un desbordamiento del b\u00fafer de la pila que puede ser explotada para una denegaci\u00f3n de servicio. Un atacante puede hacerse pasar por un Access Point y atacar a un cliente Wi-Fi vulnerable al inyectar un paquete dise\u00f1ado en el protocolo de enlace WPA2. El atacante no necesita conocer el PSK de la red"}], "lastModified": "2024-11-21T05:18:54.987", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:realtek:rtl8195a_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24D4DC02-E833-483C-885F-9E168E5F8A4C", "versionEndExcluding": "2.08"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:realtek:rtl8195a:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "62A37D39-5134-4AFE-9F59-C8C36A113B04"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "vuln@vdoo.com"}