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CVE-2022-21546: Linux Kernel Vulnerability leading to Potential System Compromise

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Overview

This report details a recently disclosed vulnerability, CVE-2022-21546, that affects the Linux kernel. The vulnerability lies specifically in the scsi: target subsystem and can potentially lead to system compromise or data leakage. With a CVSS score of 7.7, this vulnerability presents a considerable risk for systems running on the Linux kernel and underscores the need for immediate remediation.

Vulnerability Summary

CVE ID: CVE-2022-21546
Severity: High (CVSS: 7.7)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Linux Kernel | Versions prior to patch

How the Exploit Works

The vulnerability resides in the WRITE_SAME function of the scsi: target subsystem in the Linux kernel. The WRITE_SAME function allows an attacker to use commands like “sg_write_same –ndob” to set a NDOB bit, indicating that there is no data buffer to be written out. When this bit is set, the system crashes when it tries to access the se_cmd->t_data_sg because it’s NULL. If an attacker were to send a normal WRITE_SAME command with no data buffer, they could potentially compromise the system or cause data leakage.

Conceptual Example Code

Here’s a conceptual command-line example of how the vulnerability might be exploited:

$ sg_write_same --ndob /dev/sda

In this example, the sg_write_same command is used with the –ndob option on a device file, leading to a possible crash or further exploitation.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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