Vulnerability in Kernel: cfg80211_stop_ap not called when switching from P2P_GO type

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Background

The Kernel is a crucial component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and enables the execution of user programs. The cfg80211 module within the Kernel is responsible for handling wireless network configuration and management. It provides functions and interfaces for various wireless operations, including the creation and management of access points (APs) in Peer-to-Peer (P2P) mode.

Vulnerability Detail

The vulnerability identified in the cfg80211 module occurs when switching from P2P_GO (Group Owner) type to another type. In this scenario, the cfg80211_stop_ap function, which is responsible for stopping the AP, is not called. This oversight can lead to the AP remaining active even after the switch, potentially exposing the system to security risks. Attackers may exploit this vulnerability to gain unauthorized access to the network or perform other malicious activities.

Workaround

As a temporary workaround, users can manually call the cfg80211_stop_ap function when switching from P2P_GO type to ensure the AP is properly stopped. Here is an example of how to do this in C code:

#include <linux/nl80211.h>

void stop_ap_workaround()
{
    struct cfg80211_registered_device *rdev;
    struct wireless_dev *wdev;

    // Get the registered device and wireless device
    rdev = cfg80211_get_dev_by_name("wlan0");
    wdev = rdev->wiphy->wdev;

    // Check if the device is in P2P_GO mode
    if (wdev->iftype == NL80211_IFTYPE_P2P_GO) {
        // Call cfg80211_stop_ap to stop the AP
        cfg80211_stop_ap(wdev, 0);
    }

    // Release the references
    cfg80211_put_dev(rdev);
}

Conclusion

In conclusion, the vulnerability in the Kernel's cfg80211 module allows the AP to remain active when switching from P2P_GO type, potentially exposing the system to security risks. It is crucial to update the Kernel to the fixed version or apply the provided workaround to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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