CVE-2021-27803 : Security Advisory and Response

A vulnerability was discovered in how p2p/p2p_pd.c in wpa_supplicant before version 2.10 processes P2P (Wi-Fi Direct) provision discovery requests. This vulnerability could lead to denial of service or potentially allow an attacker within radio range to execute arbitrary code.

Understanding CVE-2021-27803

This section will discuss what CVE-2021-27803 is, the impact it can have, the technical details, and how to mitigate and prevent exploitation.

What is CVE-2021-27803?

This CVE refers to a vulnerability found in the way wpa_supplicant handles P2P (Wi-Fi Direct) provision discovery requests before version 2.10. Exploitation of this vulnerability could result in denial of service or even the execution of arbitrary code by an attacker within radio range.

The Impact of CVE-2021-27803

The impact of this vulnerability could be severe, potentially leading to denial of service attacks or unauthorized code execution by malicious actors within the Wi-Fi network's radio range.

Technical Details of CVE-2021-27803

Let's delve deeper into the technical aspects of this CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in p2p/p2p_pd.c in wpa_supplicant allows attackers within radio range to exploit P2P provision discovery requests, leading to potential denial of service or execution of arbitrary code.

Affected Systems and Versions

All versions of wpa_supplicant before version 2.10 are affected by this vulnerability. Users are advised to update to the latest version to mitigate the risk.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending malicious P2P provision discovery requests within the radio range of the target device, potentially causing a denial of service or remote code execution.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-27803 and prevent exploitation in the long term.

Immediate Steps to Take

Users should update wpa_supplicant to version 2.10 or later to eliminate the vulnerability and protect their systems from potential attacks.

Long-Term Security Practices

Implementing strong Wi-Fi network security measures, such as network segmentation and access control, can help prevent unauthorized access and mitigate similar vulnerabilities in the future.

Patching and Updates

Regularly checking for vendor security advisories and applying patches promptly is crucial to maintaining a secure network environment.