Integer Overflow in prealloc_elems_and_freelist() in Kernel
Summary
GSD-2021-1001507: bpf: Fix integer overflow in prealloc_elems_and_freelist(). Affects Kernel versions >= 557c0c6e7df8e14a46bd7560d193fa5bbc00a858, < 4fd6663eb01bc3c73143cd27fefd7b8351bc6aa6. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and ensures the stability and security of the system. The prealloc_elems_and_freelist() function is a part of the Kernel's BPF (Berkeley Packet Filter) subsystem, which is responsible for packet filtering and network monitoring. This vulnerability specifically affects the prealloc_elems_and_freelist() function in the BPF subsystem.
Vulnerability Detail
The prealloc_elems_and_freelist() function in the Kernel's BPF subsystem suffers from an integer overflow vulnerability. This vulnerability can be exploited by an attacker to trigger a buffer overflow or other memory corruption issues, potentially leading to arbitrary code execution or privilege escalation. The vulnerability arises due to improper handling of integer calculations, allowing an attacker to supply a large value that exceeds the intended range of the calculation. Successful exploitation of this vulnerability could result in a compromised system or unauthorized access to sensitive information.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.9.287 or later. This fix is implemented in commit 4fd6663eb01bc3c73143cd27fefd7b8351bc6aa6. Users should ensure that they are running a version of the Kernel that includes this commit or any subsequent versions that address the vulnerability. Updating the Kernel can typically be done through the package manager or by manually compiling and installing the latest version from the official Linux Kernel repository.
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Workaround
As a workaround, users can apply patches or backports provided by the Linux distribution maintainers. These patches may include specific fixes for the integer overflow vulnerability in the prealloc_elems_and_freelist() function. Users should consult the official documentation or support channels of their Linux distribution for guidance on applying these patches.
Conclusion
In conclusion, the integer overflow vulnerability in the prealloc_elems_and_freelist() function of the Kernel's BPF subsystem poses a significant risk to the security of Linux systems. It is crucial for users to update their Kernel to a version that includes the fix for this vulnerability. Applying patches or backports provided by Linux distribution maintainers can also help mitigate the risk. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can potentially allow an attacker to execute arbitrary code or escalate privileges on a compromised system. It poses a significant risk to the security and integrity of the affected 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 in real-time to identify any open-source vulnerabilities, including this specific issue.
At the time of this report, there are no known public exploits specifically targeting this vulnerability. However, it is crucial to apply the recommended fixes promptly to mitigate the risk of potential exploitation.
Yes, this vulnerability can be exploited remotely if the affected system is exposed to network-based attacks. Attackers can potentially exploit the vulnerability by sending specially crafted packets or by leveraging other network-based attack vectors.
For more detailed information about this vulnerability, including technical specifics and the commit that fixes it, please refer to the vulnerability report at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001507.json.
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