Array Overflow Vulnerability in bpf_trampoline_get_progs() in Kernel
Summary
GSD-2022-1003653: bpf: Fix potential array overflow in bpf_trampoline_get_progs(). Affects Kernel versions >= 88fd9e5352fe05f7fe57778293aebd4cd106960b, < 7f845de2863334bed4f362e95853f5e7bc323737. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functions and services to enable the proper functioning of the system. One of its functionalities is the implementation of Berkeley Packet Filter (BPF), which allows user-defined programs to run in a restricted environment. However, a vulnerability has been discovered in the bpf_trampoline_get_progs() function, which could lead to an array overflow.
Vulnerability Detail
The bpf_trampoline_get_progs() function in the Kernel is susceptible to an array overflow. This vulnerability was introduced in version v5.7 of the Kernel and fixed in version v5.10.120. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The vulnerability arises due to improper array boundary checks, allowing an attacker to overwrite adjacent memory locations. This could result in the execution of malicious code or the corruption of critical data structures.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the use of BPF programs or restrict their execution to trusted sources only. This can be achieved by modifying the system configuration to disallow the loading of BPF programs or by implementing strict access controls for BPF program execution. However, it is strongly recommended to apply the official patch or update the Kernel as soon as possible.
Conclusion
The array overflow vulnerability in the bpf_trampoline_get_progs() function of the Kernel could potentially allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. It is crucial to update the Linux Kernel to version v5.10.120 or later to mitigate this vulnerability. As a temporary workaround, users can disable or restrict the execution of BPF programs. For further assistance or support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. This can lead to unauthorized access, data corruption, or system instability.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert analyzes the package-lock.json file to identify and alert for open-source vulnerabilities in real-time.
At the time of this report, there is no known public exploit for this vulnerability. However, it is crucial to apply the recommended patch or update to mitigate the risk.
As a temporary workaround, you can disable the use of BPF programs or restrict their execution to trusted sources only. However, it is strongly advised to apply the official patch or update the Kernel to fully mitigate the vulnerability.
You can find more details about this vulnerability, including the fix and affected versions, in the vulnerability report at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2022/1003xxx/GSD-2022-1003653.json.
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