Overflow Vulnerability in seq_buf_putmem_hex() in Linux Kernel
Summary
UVI-2021-1001394: seq_buf: Fix overflow in seq_buf_putmem_hex(). Affects Kernel versions >= 5e3ca0ec76fce92daa4eed0d02de9c79b1fe3920, < 1f4c6061fccee64b2072b28dfa3e93cf859c4c0a. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources, device drivers, and facilitating communication between hardware and software components. The seq_buf module within the kernel is responsible for managing sequential buffers used for storing and manipulating data. However, a vulnerability has been discovered in the seq_buf_putmem_hex() function, which can lead to an overflow condition.
Vulnerability Detail
The seq_buf_putmem_hex() function in the seq_buf module of the Linux Kernel is susceptible to an overflow vulnerability. This vulnerability can be triggered when attempting to write a large amount of data to a sequential buffer using the seq_buf_putmem_hex() function. An attacker could exploit this vulnerability by providing specially crafted input, causing a buffer overflow and potentially leading to arbitrary code execution or a denial of service (DoS) condition. The vulnerability was introduced in version v2.6.27 of the Linux Kernel and has been fixed in version v4.19.198.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can mitigate the risk by avoiding scenarios where large amounts of data are written to sequential buffers using the seq_buf_putmem_hex() function. Additionally, implementing input validation and size checks when using the seq_buf module can help prevent potential buffer overflows.
Conclusion
The overflow vulnerability in the seq_buf_putmem_hex() function of the Linux Kernel can potentially lead to arbitrary code execution or a denial of service (DoS) condition. It is crucial to update the Linux Kernel to version v4.19.198 or later to mitigate this vulnerability. Implementing input validation and size checks when using the seq_buf module can provide additional protection. 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 (DoS) condition on a system running an affected version of the Linux Kernel.
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 specific issue.
There is no evidence of this vulnerability being exploited in the wild at the time of this report. However, it is crucial to apply the recommended fix to ensure the security and stability of your system.
Implementing input validation and size checks when using the seq_buf module can help mitigate the risk of buffer overflows. Additionally, updating to the fixed version of the Linux Kernel is the most effective way to address this vulnerability.
The vulnerability was discovered by an automated security analysis tool and reported to the Linux Kernel development team. The details of the discovery and fix can be found in the provided references.
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