SB2021060501 - Remote code execution when parsing WPA2 key in Realtek WiFi chipsets

Security Bulletin ID SB2021060501

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 2

Exploitation vector Adjecent network

Highest impact Code execution

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 2 vulnerabilities.

1) Stack-based buffer overflow (CVE-ID: CVE-2020-27301)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when parsing WPA2 key. A remote attacker with knowledge of network PSK can send specially crafted packets to devices connected to the WiFi network, trigger stack-based buffer overflow and execute arbitrary code on WiFi client devices.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Stack-based buffer overflow (CVE-ID: CVE-2020-27302)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when parsing WPA2 key. A remote attacker with knowledge of network PSK can send specially crafted packets to devices connected to the WiFi network, trigger stack-based buffer overflow and execute arbitrary code on WiFi client devices.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

https://www.vdoo.com/blog/realtek-wifi-vulnerabilities-zero-day