CVE-2017-17840 : What You Need to Know

A vulnerability has been found in Open-iSCSI up to version 2.0.875 that can be exploited by an attacker with local access to cause the iscsiuio server to terminate or potentially run code by sending messages with incorrect lengths, leading to buffer overflows and potential code execution.

Understanding CVE-2017-17840

This CVE identifies a security issue in Open-iSCSI that allows a local attacker to trigger buffer overflows and potentially execute arbitrary code.

What is CVE-2017-17840?

This vulnerability in Open-iSCSI up to version 2.0.875 enables a local attacker to disrupt the iscsiuio server or execute code by sending messages with incorrect lengths, leading to buffer overflows and potential code execution.

The Impact of CVE-2017-17840

The vulnerability can result in the termination of the iscsiuio server or allow an attacker to execute arbitrary code, posing a significant security risk to affected systems.

Technical Details of CVE-2017-17840

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The function process_iscsid_broadcast in iscsiuio/src/unix/iscsid_ipc.c does not properly verify the length of the payload before performing a write operation, allowing attackers to exploit this flaw.

Affected Systems and Versions

Open-iSCSI up to version 2.0.875

Exploitation Mechanism

An attacker with local access can send messages with incorrect lengths to trigger buffer overflows and potentially execute code.

Mitigation and Prevention

Protecting systems from CVE-2017-17840 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Restrict network access to vulnerable systems.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Implement the principle of least privilege to limit access rights for users and processes.
Conduct regular security audits and penetration testing to identify and address security weaknesses.
Educate users and administrators about security best practices.

Patching and Updates

Stay informed about security updates and patches released by the Open-iSCSI project to address CVE-2017-17840.