SB2021020803 - Multiple vulnerabilities in Realtek RTL8195AM, RTL8711AM, RTL8711AF and RTL8710AF devices

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Stack-based buffer overflow (CVE-ID: CVE-2020-25857)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the "ClientEAPOLKeyRecvd()" function. A remote unauthenticated attacker can inject a specially crafted packet to the WPA2 handshake, trigger stack-based buffer overflow and cause a denial of service condition on the target system.

2) Stack-based buffer overflow (CVE-ID: CVE-2020-25856)

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

The vulnerability exists due to the "DecWPA2KeyData()" function does not validate the size parameter for an "rtl_memcpy()" operation. A remote unauthenticated attacker can inject a specially crafted packet to the WPA2 handshake, trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

3) Stack-based buffer overflow (CVE-ID: CVE-2020-25855)

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

The vulnerability exists due to a boundary error in the "AES_UnWRAP()" function. A remote unauthenticated attacker can inject a specially crafted packet to the WPA2 handshake, trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

4) Stack-based buffer overflow (CVE-ID: CVE-2020-25854)

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

The vulnerability exists due to a boundary error in the "DecWPA2KeyData" function. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

5) Out-of-bounds read (CVE-ID: CVE-2020-25853)

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the "CheckMic()" function. A remote attacker can trigger out-of-bounds read error and cause a denial of service condition on the system.

6) Stack-based buffer overflow (CVE-ID: CVE-2020-9395)

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

The vulnerability exists due to a boundary error when processing a malformed EAPOL-Key packet with a long keydata buffer. A remote authenticated attacker on the local network can trigger stack-based buffer overflow and execute arbitrary code on the target system.

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-rtl8195a-vulnerabilities-discovered/
• https://github.com/ambiot/amb1_arduino/commit/dcea55cf9775a0166805b3db845b237ecd5e74ea#diff-d06e7a87f34cc464a56799a419033014
• https://github.com/ambiot/amb1_sdk/commit/bc5173d5d4faf6829074b0f1e1b242c12b7777a3#diff-700c216fb376666eaeda0c892e8bdc09
• https://www.amebaiot.com/en/security_bulletin/
• https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered