Integer Overflow Vulnerability in bpf Package
Summary
GSD-2021-1001696: bpf: Fix integer overflow in prealloc_elems_and_freelist(). Affects Kernel versions >= 557c0c6e7df8e14a46bd7560d193fa5bbc00a858, < 3a1ac1e368bedae2777d9a7cfdc65df4859f7e71. No fix is published. How to fix ↓
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Background
The bpf package is a component of the Linux Kernel, which is responsible for implementing Berkeley Packet Filters (BPF). BPF provides a framework for executing custom programs within the kernel, allowing for efficient packet filtering and network monitoring. It is widely used in various networking and security applications. However, a vulnerability has been identified in the bpf package that could lead to an integer overflow.
Vulnerability Detail
The identified vulnerability in the bpf package is an integer overflow in the prealloc_elems_and_freelist() function. This vulnerability was introduced in version v4.6 of the Linux Kernel and has been present until version v5.14.12. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The integer overflow occurs when preallocating elements and freelist, leading to memory corruption and potential security risks.
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 Linux Kernel installation. Here is an example of how to apply the patch:
- Clone the Linux Kernel repository:
git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git - Checkout the desired version:
git checkout v5.14.12 - Apply the patch:
git apply <path_to_patch_file> - Recompile and install the patched kernel.
Note: This workaround requires knowledge of kernel compilation and may not be suitable for all users.
Conclusion
In conclusion, the bpf package in the Linux Kernel is vulnerable to an integer overflow in the prealloc_elems_and_freelist() function. This vulnerability can be fixed by updating the Linux Kernel to version v5.14.12 or later. Alternatively, users can apply the provided patch manually. It is recommended to take immediate action to mitigate the potential risks associated with this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The bpf package is a component of the Linux Kernel that implements Berkeley Packet Filters (BPF). It allows for the execution of custom programs within the kernel, enabling efficient packet filtering and network monitoring.
An integer overflow occurs when the result of an arithmetic operation exceeds the maximum value that can be represented by the data type. In the case of this vulnerability, an integer overflow in the prealloc_elems_and_freelist() function leads to memory corruption and potential security risks.
This vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. By exploiting the integer overflow in the bpf package, an attacker may gain unauthorized access or disrupt the normal operation of the system.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities, using just a manifest file like package-lock.json.
For more information about this vulnerability, you can refer to the vulnerability database entry at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001696.json.
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