Vulnerability in Linux Kernel: exec: Force single empty string when argv is empty
Summary
GSD-2022-1001901: exec: Force single empty string when argv is empty. Affects Kernel versions < 1290eb4412aa0f0e9f3434b406dc8e255da85f9e. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware. It is widely used in various devices, including servers, desktops, and embedded systems. The vulnerability identified in this report affects the Linux Kernel and specifically relates to the 'exec' function. The 'exec' function is used to replace the current process image with a new process image. When the 'argv' parameter of the 'exec' function is empty, it is expected to be a null pointer. However, due to a coding error, the 'argv' parameter is not properly handled, leading to potential security issues.
Vulnerability Detail
The vulnerability arises when the 'argv' parameter of the 'exec' function is empty. Instead of being treated as a null pointer, it is not handled correctly, potentially allowing an attacker to exploit this behavior. By crafting a malicious input, an attacker could trigger unexpected behavior or even execute arbitrary code with elevated privileges. The impact of this vulnerability can vary depending on the context in which the 'exec' function is used. However, it has the potential to lead to privilege escalation, unauthorized access, or denial of service.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, developers can ensure that the 'argv' parameter of the 'exec' function is never empty. This can be achieved by explicitly providing at least one argument, even if it is an empty string. By doing so, the vulnerability can be mitigated. Here is an example of how to modify the code to enforce a single empty string when 'argv' is empty:
if (argv == NULL) {
argv = (char*[]) { "", NULL };
}
Conclusion
In conclusion, the vulnerability in the Linux Kernel's 'exec' function could allow an attacker to exploit the mishandling of the 'argv' parameter, potentially leading to unauthorized access or other security issues. It is crucial to update the Linux Kernel to the latest version to mitigate this vulnerability. For further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware.
The 'exec' function is used to replace the current process image with a new process image. It is commonly used to execute other programs or scripts within a program.
By crafting a malicious input and exploiting the mishandling of the 'argv' parameter in the 'exec' function, an attacker could trigger unexpected behavior or execute arbitrary code with elevated privileges.
The impact of this vulnerability can vary depending on the context in which the 'exec' function is used. However, it has the potential to lead to privilege escalation, unauthorized access, or denial of service.
Yes, the vulnerability has been fixed in the Linux Kernel version v5.15.33 by commit 1290eb4412aa0f0e9f3434b406dc8e255da85f9e.
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