Vulnerability in smackfs package: Restrict Bytes Count in smk_set_cipso()
Summary
GSD-2021-1001207: smackfs: restrict bytes count in smk_set_cipso(). Affects Kernel versions < 258fd821f69378453c071b9dd767b298810fc766. No fix is published. How to fix ↓
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Background
The smackfs package is a component of the Linux Kernel, which is responsible for implementing the Security-Enhanced Linux (SELinux) Mandatory Access Control (MAC) mechanism. It provides a file system interface for managing Security-Enhanced (SE) Linux labels and policies. The smk_set_cipso() function within smackfs is used to set the Common IP Security Option (CIPSO) label on a file or directory. This label is used to enforce access control policies based on the sensitivity level of the data. However, a vulnerability has been identified in the implementation of smk_set_cipso() that allows for unrestricted bytes count, potentially leading to security breaches and unauthorized access to sensitive information.
Vulnerability Detail
The vulnerability in smackfs arises from the lack of proper restriction on the bytes count parameter in the smk_set_cipso() function. An attacker could exploit this flaw by providing a maliciously crafted input, causing a buffer overflow or other memory corruption issues. This could result in arbitrary code execution, privilege escalation, or denial of service. The impact and attack plausibility of this vulnerability have not been proven yet, but it poses a potential risk to the security and integrity of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can apply access control measures and restrict access to vulnerable systems or components. Additionally, it is advisable to monitor system logs for any suspicious activities and promptly apply security patches or updates as they become available.
Conclusion
In conclusion, the smackfs package in the Linux Kernel is vulnerable to an unrestricted bytes count issue in the smk_set_cipso() function. This vulnerability can potentially lead to security breaches and unauthorized access to sensitive information. It is recommended to update the Linux Kernel to version v5.13.3 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
smackfs is a component of the Linux Kernel that implements the Security-Enhanced Linux (SELinux) Mandatory Access Control (MAC) mechanism. It provides a file system interface for managing SELinux labels and policies.
The smk_set_cipso() function in smackfs is used to set the Common IP Security Option (CIPSO) label on a file or directory. This label is used for enforcing access control policies based on the sensitivity level of the data.
The unrestricted bytes count in smk_set_cipso() can lead to security breaches and unauthorized access to sensitive information. It may allow for arbitrary code execution, privilege escalation, or denial of service attacks.
There is no evidence of this vulnerability being exploited in the wild at the moment. However, it is crucial to apply the recommended fix to mitigate potential risks.
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