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

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6.0	$0-$5k	0.00

A vulnerability has been found in Realtek RTL8195A and classified as critical. This vulnerability affects 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. The CWE definition for the vulnerability is CWE-121. As an impact it is known to affect 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 internal function, rt_arc4_crypt_veneer() or _AES_UnWRAP_veneer(), 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 presented 02/04/2021. The advisory is shared for download at vdoo.com. This vulnerability was named CVE-2020-25854 since 09/23/2020. The exploitation appears to be easy. The attack can be initiated remotely. Required for exploitation is a single authentication. There are known technical details, but no exploit is available.

Upgrading to version 2.08 eliminates this vulnerability.

Productinfoedit

Vendor

Realtek

Name

RTL8195A

CPE 2.3infoedit

🔒

CPE 2.2infoedit

🔒

CVSSv3infoedit

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: 🔒
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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 Intelligenceinfoedit

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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-2020-25854 (🔒)

Entryinfoedit

Created: 02/04/2021 10:19 AM
Updated: 02/23/2021 12:38 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
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