CVE-2017-18551 Explained : Impact and Mitigation

A problem was identified in the Linux kernel prior to version 4.14.15, specifically in the drivers/i2c/i2c-core-smbus.c file. The function i2c_smbus_xfer_emulated has a write operation that exceeds the bounds.

Understanding CVE-2017-18551

An issue was discovered in drivers/i2c/i2c-core-smbus.c in the Linux kernel before 4.14.15. There is an out-of-bounds write in the function i2c_smbus_xfer_emulated.

What is CVE-2017-18551?

CVE-2017-18551 is a vulnerability found in the Linux kernel before version 4.14.15, specifically in the drivers/i2c/i2c-core-smbus.c file.

The Impact of CVE-2017-18551

The vulnerability allows attackers to perform a write operation that exceeds the bounds, potentially leading to a security breach or system compromise.

Technical Details of CVE-2017-18551

The following are technical details of the CVE-2017-18551 vulnerability:

Vulnerability Description

The issue lies in the drivers/i2c/i2c-core-smbus.c file in the Linux kernel before version 4.14.15, involving an out-of-bounds write in the function i2c_smbus_xfer_emulated.

Affected Systems and Versions

Systems running Linux kernel versions prior to 4.14.15 are vulnerable to CVE-2017-18551.

Exploitation Mechanism

Attackers can exploit this vulnerability by executing a write operation that exceeds the expected bounds, potentially leading to unauthorized access or system compromise.

Mitigation and Prevention

Here are the steps to mitigate and prevent the CVE-2017-18551 vulnerability:

Immediate Steps to Take

Update the Linux kernel to version 4.14.15 or newer to patch the vulnerability.
Monitor for any unusual system behavior that might indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel and other software components to ensure the latest security patches are applied.
Implement access controls and monitoring mechanisms to detect and prevent unauthorized system access.

Patching and Updates

Stay informed about security advisories and updates from Linux kernel maintainers to promptly address any new vulnerabilities.