Overflow Vulnerability in seq_buf_putmem_hex() in Kernel
Summary
UVI-2021-1001222: seq_buf: Fix overflow in seq_buf_putmem_hex(). Affects Kernel versions >= 5e3ca0ec76fce92daa4eed0d02de9c79b1fe3920, < d57fcab190b60f43046d5836c3c56114b4f50080. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The seq_buf_putmem_hex() function is part of the seq_buf API, which is used for sequential output formatting. This vulnerability affects the Kernel package and can lead to a buffer overflow.
Vulnerability Detail
The seq_buf_putmem_hex() function in the Kernel is susceptible to a buffer overflow. This occurs when the function is provided with a large input, causing it to write beyond the allocated buffer. An attacker could exploit this vulnerability to overwrite adjacent memory, potentially leading to arbitrary code execution or a system crash. The vulnerability was introduced in version 2.6.27 of the Kernel and has been fixed in version 5.13.3.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply input validation to limit the size of the input provided to the seq_buf_putmem_hex() function. By ensuring that the input does not exceed the allocated buffer size, the risk of a buffer overflow can be mitigated. Here is an example of how input validation can be implemented in C:
#include <linux/seq_buf.h>
void my_seq_buf_putmem_hex(struct seq_buf *s, const void *mem, size_t len) {
if (len > SEQ_BUF_MAX_SIZE)
len = SEQ_BUF_MAX_SIZE;
seq_buf_putmem_hex(s, mem, len);
}
Conclusion
In conclusion, the seq_buf_putmem_hex() function in the Kernel is vulnerable to a buffer overflow. This can be exploited by an attacker to execute arbitrary code or crash the system. It is crucial to update the Kernel package to version 5.13.3 or later to mitigate this vulnerability. Regularly updating the Kernel package is recommended to ensure the latest security patches are applied. 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 crash the system by overwriting adjacent memory.
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.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix to mitigate any potential risks.
This vulnerability specifically affects the Kernel package. However, it is always recommended to keep all software dependencies up to date to ensure the overall security of the system.
The vulnerability was discovered by an automated security analysis tool and reported in the Open Source Vulnerability format. The details of the discovery can be found in the provided references link.
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