Bluetooth cmtp: Fix File Refcount When cmtp_attach_device Fails
Summary
GSD-2021-1000707: Bluetooth: cmtp: fix file refcount when cmtp_attach_device fails. Affects Kernel versions < 61a811e8f5229264b822361f8b23d7638fd8c914. No fix is published. How to fix ↓
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Background
The Bluetooth cmtp module is responsible for handling the Connection Manager Transport Protocol (CMTP) in the Linux Kernel. CMTP is used for transferring files over Bluetooth connections. The cmtp_attach_device function is called when a new CMTP device is detected. However, there is a vulnerability in this function that leads to a file reference count issue when the device attachment fails.
Vulnerability Detail
The vulnerability in the cmtp_attach_device function can result in a file reference count problem. When the device attachment fails, the file reference count is not properly handled, leading to a potential use-after-free vulnerability. An attacker could exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The Bluetooth cmtp vulnerability in the Linux Kernel can lead to a use-after-free issue when device attachment fails. It is crucial to update the Linux Kernel to version v4.4.271 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially allow an attacker to execute arbitrary code or cause a denial-of-service condition.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities.
At the time of this report, there is no known exploit for this vulnerability. However, it is still important to patch your system to prevent any potential attacks.
The recommended mitigation is to update the Linux Kernel to the latest stable version, which includes the fix for this vulnerability.
You can find more information about this vulnerability in the Linux Kernel's Git repository. The specific commit that fixes this issue is 61a811e8f5229264b822361f8b23d7638fd8c914.
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