Double fput() on failed usercopy in Linux Kernel
Summary
GSD-2022-1000337: misc: fastrpc: avoid double fput() on failed usercopy. Affects Kernel versions >= 6cffd79504ce040f460831030d3069fa1c99bb71, < 4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware. It is a critical piece of software that is constantly being developed and maintained by a large community of contributors. The fastrpc module in the Linux Kernel is used for fast remote procedure calls between different processes. It allows processes to communicate efficiently by passing data structures and function calls between them.
Vulnerability Detail
The vulnerability identified as GSD-2022-1000337 in the fastrpc module of the Linux Kernel involves a double fput() on a failed usercopy operation. This vulnerability can potentially be exploited by an attacker to cause a denial of service or escalate privileges. When a usercopy operation fails, the code attempts to clean up resources by calling fput() twice on the same file structure, leading to a use-after-free vulnerability. An attacker could potentially trigger this vulnerability by crafting a malicious request that triggers a failed usercopy operation, leading to the execution of arbitrary code or a system crash.
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 double fput() on failed usercopy vulnerability in the fastrpc module of the Linux Kernel can potentially lead to a denial of service or privilege escalation. It is crucial to update the Linux Kernel to the fixed version to mitigate this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability can range from a denial of service to privilege escalation. An attacker could potentially exploit this vulnerability to execute arbitrary code or crash the system.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix as soon as possible to mitigate any potential risks.
The recommended solution is to update the Linux Kernel to the fixed version. However, if updating is not feasible, you can consider implementing additional security measures such as restricting access to the affected module or implementing intrusion detection systems to monitor for any potential exploitation attempts.
This vulnerability was discovered by the Cloud Security Alliance (CSA) and reported through their GSD database. The CSA is a non-profit organization dedicated to promoting best practices for secure cloud computing.
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