Re: wpa_supplicant P2P provision discovery processing vulnerability

                							

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Re: wpa_supplicant P2P provision discovery processing vulnerability

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From: Salvatore Bonaccorso &lt;carnil () debian org&gt;

Date: Sat, 27 Feb 2021 07:54:16 +0100

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Hi,

On Thu, Feb 25, 2021 at 09:03:50PM +0200, Jouni Malinen wrote:
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)

CVE-2021-27803 is assigned for this issue:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27803

Regards,
Salvatore

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wpa_supplicant P2P provision discovery processing vulnerability Jouni Malinen (Feb 25)

Re: wpa_supplicant P2P provision discovery processing vulnerability Salvatore Bonaccorso (Feb 26)

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