Impact

Anyone with webserver enabled and HTTP basic auth configured on 2021.9.1 or older

webserver allows OTA update without checking user defined basic auth username & password

Patches

Patch released in 2021.9.2

Workarounds

Disable/remove webserver

An encryption-bypass issue was discovered on Espressif ESP-IDF devices through 4.2, ESP8266NONOSSDK devices through 3.0.3, and ESP8266RTOSSDK devices through 3.3. Broadcasting forged beacon frames forces a device to change its authentication mode to OPEN, effectively disabling its 802.11 encryption.

The EAP peer implementation in Espressif ESP-IDF 2.0.0 through 4.0.0 and ESP8266NONOSSDK 2.2.0 through 3.1.0 processes EAP Success messages before any EAP method completion or failure, which allows attackers in radio range to cause a denial of service (crash) via a crafted message.

The EAP peer implementation in Espressif ESP-IDF 2.0.0 through 4.0.0 and ESP8266NONOSSDK 2.2.0 through 3.1.0 allows the installation of a zero Pairwise Master Key (PMK) after the completion of any EAP authentication method, which allows attackers in radio range to replay, decrypt, or spoof frames via a rogue access point.

The client 802.11 mac implementation in Espressif ESP8266NONOSSDK 2.2.0 through 3.1.0 does not validate correctly the RSN AuthKey suite list count in beacon frames, probe responses, and association responses, which allows attackers in radio range to cause a denial of service (crash) via a crafted message.