Vulnerability in Kernel: smackfs: restrict bytes count in smk_set_cipso()
Summary
GSD-2021-1001347: smackfs: restrict bytes count in smk_set_cipso(). Affects Kernel versions < 135122f174c357b7a3e58f40fa5792156c5e93e6. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The smackfs module in the Kernel is responsible for enforcing the Smack (Simplified Mandatory Access Control Kernel) security policies. Smack is a Linux security module that implements mandatory access control rules based on labels assigned to processes and files. The smk_set_cipso() function in smackfs is used to set the CIPSO (Common IP Security Option) label on a file. This label provides additional security attributes for network communication. However, a vulnerability has been discovered in the implementation of smk_set_cipso() that allows an attacker to exceed the expected byte count, potentially leading to memory corruption or other security issues.
Vulnerability Detail
The vulnerability in smackfs arises from a lack of proper input validation in the smk_set_cipso() function. By providing a maliciously crafted input with an excessive byte count, an attacker can trigger a buffer overflow or other memory corruption issues. This could potentially allow the attacker to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven, but it is essential to address it to ensure the security of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the Smack security module or restrict access to the vulnerable functionality. However, these workarounds may impact the overall security posture of the system and should only be considered if updating the Kernel is not immediately feasible. Disabling the Smack security module can be achieved by modifying the system's configuration files or kernel boot parameters. It is recommended to consult the official documentation or seek assistance from the system administrator for proper guidance on implementing these workarounds.
Conclusion
The vulnerability in smackfs, which allows an attacker to exceed the expected byte count in smk_set_cipso(), poses a potential security risk. It is crucial to update the Linux Kernel to version v5.4.133 or later to mitigate this vulnerability. Disabling the Smack security module or implementing access restrictions can serve as temporary workarounds, but updating the Kernel is the recommended long-term solution. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software.
smackfs is a module in the Linux Kernel that enforces the Smack (Simplified Mandatory Access Control Kernel) security policies.
Smack is a Linux security module that implements mandatory access control rules based on labels assigned to processes and files.
CIPSO (Common IP Security Option) is a security label used for network communication, providing additional security attributes.
This vulnerability could potentially allow an attacker to execute arbitrary code, escalate privileges, or cause a denial-of-service condition.
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