CVE-2020-9383 : Security Advisory and Response

An issue was discovered in the Linux kernel 3.16 through 5.5.6. set_fdc in drivers/block/floppy.c leads to a wait_til_ready out-of-bounds read because the FDC index is not checked for errors before assigning it, aka CID-2e90ca68b0d2.

Understanding CVE-2020-9383

This CVE involves a vulnerability in the Linux kernel that could potentially lead to security issues.

What is CVE-2020-9383?

The vulnerability in the Linux kernel version range 3.16 through 5.5.6, specifically in the set_fdc function in drivers/block/floppy.c, allows for an out-of-bounds read due to the lack of error checking on the FDC index assignment.

The Impact of CVE-2020-9383

This vulnerability could be exploited by attackers to read out-of-bounds memory, potentially leading to sensitive data exposure or system crashes.

Technical Details of CVE-2020-9383

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from the set_fdc function in drivers/block/floppy.c, which lacks proper error checking on the FDC index assignment, enabling an out-of-bounds read.

Affected Systems and Versions

Linux kernel versions 3.16 through 5.5.6

Exploitation Mechanism

Attackers can exploit this vulnerability to perform out-of-bounds reads, potentially leading to information disclosure or system instability.

Mitigation and Prevention

Protecting systems from CVE-2020-9383 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers promptly.
Monitor official sources for updates and security advisories related to the Linux kernel.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement proper access controls and monitoring to detect and prevent unauthorized access.

Patching and Updates

Stay informed about security updates and patches released by the Linux kernel community.