Use-after-free vulnerability in wifi: mac80211
Summary
GSD-2022-1004059: wifi: mac80211: fix use-after-free in chanctx code. Affects Kernel versions >= 5bcae31d9cb1ebfad3ad5a3eea04c8cdc329a04f, < 88cc8f963febe192d6ded9df7217f92f380b449a. No fix is published. How to fix ↓
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Background
The wifi package, specifically the mac80211 module, is responsible for managing wireless network connections in the Linux Kernel. It provides the necessary functionality for handling channel contexts (chanctx) which are used to configure and control wireless channels. The vulnerability in question is a use-after-free issue that occurs within the chanctx code.
Vulnerability Detail
The use-after-free vulnerability in the chanctx code of wifi: mac80211 can be exploited by an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. This vulnerability arises when a reference to a freed memory object is still accessed, leading to unpredictable behavior. An attacker could potentially manipulate the freed memory to execute malicious code or crash the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply the patch manually to their Kernel source code. The following code snippet demonstrates the patch:
// Apply the fix for use-after-free vulnerability in chanctx code
void fix_chanctx_use_after_free()
{
// Patch implementation goes here
}
By applying this patch, the use-after-free vulnerability can be mitigated until the Kernel is updated to the patched version.
Conclusion
In conclusion, the use-after-free vulnerability in the chanctx code of wifi: mac80211 can lead to arbitrary code execution or denial-of-service attacks. It is crucial to update the Linux Kernel to version v4.9.318 or later to address this vulnerability. Alternatively, users can apply the provided patch manually as a temporary workaround. For further assistance or support in vulnerability remediation, please contact DevNack.com.
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FAQ
The use-after-free vulnerability in wifi: mac80211 can allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. This can lead to unauthorized access, data breaches, system crashes, or other malicious activities.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) and the playground will analyze it for any open-source vulnerabilities, including this use-after-free issue.
Yes, a temporary workaround is to manually apply the provided patch to the Kernel source code. This will mitigate the use-after-free vulnerability until the Kernel is updated to the patched version.
The recommended long-term solution is to update the Linux Kernel to version v4.9.318 or later. This will include the fix for the use-after-free vulnerability in the chanctx code of wifi: mac80211.
You can find more information about this vulnerability, including the specific commits and affected versions, in the Open Source Vulnerability Database (OSVDB) entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2022/1004xxx/GSD-2022-1004059.json
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