SCSI Command Authorization Bypass in Linux Kernel - CVE-2012-4542
Summary
DEBIAN-CVE-2012-4542: block/scsi_ioctl.c in the Linux kernel through 3.8 does not properly consider the SCSI device class during authorization of SCSI commands, which allows local users to bypass intended access restrictions via an SG_IO ioct... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is a core component of the operating system that manages hardware resources and provides essential services for software applications. It is responsible for facilitating communication between hardware and software, ensuring efficient resource management, and maintaining system stability. The vulnerability identified as CVE-2012-4542 affects the SCSI (Small Computer System Interface) subsystem of the Linux kernel, which is responsible for handling SCSI devices. This vulnerability allows local users to bypass access restrictions on SCSI commands, potentially leading to unauthorized access to sensitive data or system resources.
Vulnerability Detail
The vulnerability exists in the block/scsi_ioctl.c file of the Linux kernel up to version 3.8. It fails to properly consider the SCSI device class when authorizing SCSI commands. This oversight allows local users to exploit the SG_IO ioctl call, leveraging overlapping opcodes to bypass intended access restrictions. The ramifications of this vulnerability include unauthorized access to SCSI devices, which could lead to data leakage, system instability, or further exploitation of the system. It is crucial for system administrators to address this vulnerability to maintain system integrity and security.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, system administrators can restrict access to SCSI devices by implementing stricter user permissions and access controls. This can help mitigate the risk of unauthorized access until the system can be updated to a patched version.
Conclusion
CVE-2012-4542 is a significant vulnerability in the Linux kernel that can lead to unauthorized access to SCSI devices. It is essential for users and administrators to update their systems to patched versions to mitigate the risks associated with this vulnerability. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2012-4542 is a vulnerability in the Linux kernel that allows local users to bypass access restrictions on SCSI commands, potentially leading to unauthorized access to sensitive data.
The vulnerability affects the Linux kernel through version 3.8.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected by this vulnerability without any signup.
The risks include unauthorized access to SCSI devices, data leakage, and potential exploitation of the system, which could compromise its integrity and security.
If immediate updates are not possible, consider implementing stricter user permissions and access controls as a temporary workaround to mitigate risks.
References
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