oss-security - wpa_supplicant P2P provision discovery processing vulnerability

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210225190350.GB474115@w1.fi>
Date: Thu, 25 Feb 2021 21:03:50 +0200
From: Jouni Malinen <j@...fi>
To: oss-security@...ts.openwall.com
Subject: wpa_supplicant P2P provision discovery processing vulnerability

Published: February 25, 2021
Latest version available from: https://w1.fi/security/2021-1/

Vulnerability

A vulnerability was discovered in how wpa_supplicant processes P2P
(Wi-Fi Direct) provision discovery requests. Under a corner case
condition, an invalid Provision Discovery Request frame could end up
reaching a state where the oldest peer entry needs to be removed. With
a suitably constructed invalid frame, this could result in use
(read+write) of freed memory. This can result in an attacker within
radio range of the device running P2P discovery being able to cause
unexpected behavior, including termination of the wpa_supplicant process
and potentially code execution.

Vulnerable versions/configurations

wpa_supplicant v1.0-v2.9 with CONFIG_P2P build option enabled

An attacker (or a system controlled by the attacker) needs to be within
radio range of the vulnerable system to send a set of suitably
constructed management frames that trigger the corner case to be reached
in the management of the P2P peer table.

Possible mitigation steps

- Merge the following commit to wpa_supplicant and rebuild it:

  P2P: Fix a corner case in peer addition based on PD Request

  This patch is available from https://w1.fi/security/2021-1/

- Update to wpa_supplicant v2.10 or newer, once available

- Disable P2P (control interface command "P2P_SET disabled 1" or
  "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant
  configuration file)

- Disable P2P from the build (remove CONFIG_P2P=y)

-- 
Jouni Malinen                                            PGP id EFC895FA

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.