Realtek RTL8195A prior 2.08 WPA2 Handshake DecWPA2KeyData size stack-based overflow

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A vulnerability was found in Realtek RTL8195A. It has been classified as critical. Affected is the function DecWPA2KeyData of the component WPA2 Handshake Handler. The manipulation of the argument size with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-121. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The function DecWPA2KeyData() 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 remote code execution or 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 needs to know the network's PSK in order to exploit this.

The weakness was published 02/04/2021. The advisory is available at vdoo.com. This vulnerability is traded as CVE-2020-25856 since 09/23/2020. The exploitability is told to be easy. It is possible to launch the attack remotely. The successful exploitation needs a authentication. Technical details are known, but there is no available exploit.

Upgrading to version 2.08 eliminates this vulnerability.

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VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-121
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: RTL8195A 2.08

Timelineinfoedit

09/23/2020 CVE assigned
02/04/2021 +134 days Advisory disclosed
02/04/2021 +0 days VulDB entry created
02/23/2021 +19 days VulDB last update

Sourcesinfoedit

Advisory: vdoo.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2020-25856 (🔒)

Entryinfoedit

Created: 02/04/2021 10:32 AM
Updated: 02/23/2021 12:51 PM
Changes: (6) source_cve_assigned source_cve_nvd_summary advisory_confirm_url vulnerability_cvss2_vuldb_tempscore vulnerability_cvss3_vuldb_tempscore vulnerability_cvss3_meta_tempscore
Complete: 🔍

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