Connection Failure Vulnerability in Linux Package: ECSA Element Detection Issue
Summary
DEBIAN-CVE-2024-26683: In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: detect stuck ECSA element in probe resp We recently added some validation that we don't try to connect to an AP that is currently in a c... Affects linux versions < 6.7.7-1. Fixed in 6.7.7-1. How to fix ↓
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Background
The Linux package is a core component of the Debian operating system, providing essential functionalities for managing hardware and system resources. It is widely used across various distributions and versions, including Debian 13 and 14. This package is crucial for system stability and performance, making its security paramount. The vulnerability in question affects the wireless connectivity features, specifically related to the handling of Extended Channel Switch Announcement (ECSA) elements during connection attempts to access points (APs).
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the wifi subsystem, specifically in the cfg80211 module. This issue arises when the system attempts to connect to an access point that is in the process of a channel switch, which can lead to connection failures. The problem was introduced in a recent commit aimed at preventing connections to APs during channel switch processes. However, it was discovered that some APs, such as the Asus RT-AC53, may incorrectly advertise an extended channel switch announcement, causing persistent connection issues. This vulnerability can lead to significant disruptions in network connectivity for users relying on affected devices.
How To Fix
Minimum fixed version
6.7.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users experiencing connection issues may try to manually connect to the AP after ensuring that it is not in a channel switch process. Additionally, users can check their AP's firmware and consider updating it to the latest version provided by the manufacturer, which may resolve the ECSA advertising issue.
Conclusion
The vulnerability identified in the Linux package poses a significant risk to users relying on wireless connectivity. By updating to the patched version, users can mitigate the risks associated with this issue. It is essential to stay informed about such vulnerabilities and apply updates promptly to maintain system security.
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FAQ
The vulnerability involves connection failures when attempting to connect to access points that incorrectly advertise extended channel switch announcements.
The vulnerability affects the Linux package in Debian 13 and 14 prior to version 6.7.7-1.
You can use Vulert, which monitors open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without any signup.
If an immediate update is not possible, consider using the provided workaround to manually connect to the AP or check for firmware updates from the AP manufacturer.
Detailed information about this vulnerability can be found in the Debian CVE database and through security advisories related to the Linux kernel.
References
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