Vulnerability CVE-2020-12638
Published: 2020-07-23

Description:
An encryption-bypass issue was discovered on Espressif ESP-IDF devices through 4.2, ESP8266_NONOS_SDK devices through 3.0.3, and ESP8266_RTOS_SDK devices through 3.3. Broadcasting forged beacon frames forces a device to change its authentication mode to OPEN, effectively disabling its 802.11 encryption.

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:A/AC:M/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
4.9/10
5.5/10
Exploit range
Attack complexity
Authentication
Adjacent network
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Espressif -> Esp-idf 
Espressif -> Esp8266 nonos sdk 
Espressif -> Esp8266 rtos sdk 

 References:
https://github.com/espressif/ESP8266_NONOS_SDK
https://github.com/espressif/ESP8266_RTOS_SDK
https://github.com/espressif/esp-idf
https://lbsfilm.at/blog/wpa2-authenticationmode-downgrade-in-espressif-microprocessors
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