CVE-2019-18930 : What You Need to Know

The firmware version 2.31.183 of Western Digital My Cloud EX2 Ultra has a vulnerability that allows remote attackers to execute arbitrary code through a stack-based buffer overflow.

Understanding CVE-2019-18930

This CVE entry describes a critical vulnerability in the Western Digital My Cloud EX2 Ultra firmware version 2.31.183.

What is CVE-2019-18930?

The vulnerability in the firmware allows remote attackers, including guest accounts, to execute arbitrary code due to a lack of size verification logic in a specific function in libscheddl.so. Additionally, the download_mgr.cgi feature enables attackers to exploit the vulnerability by entering large-sized f_idx inputs.

The Impact of CVE-2019-18930

The impact of this vulnerability is severe as it allows unauthorized remote code execution, potentially leading to a complete compromise of the affected system.

Technical Details of CVE-2019-18930

This section provides more technical insights into the CVE-2019-18930 vulnerability.

Vulnerability Description

The vulnerability arises from the absence of size verification logic in a function in libscheddl.so, allowing attackers to trigger a stack-based buffer overflow.

Affected Systems and Versions

Product: Western Digital My Cloud EX2 Ultra
Version: 2.31.183

Exploitation Mechanism

Attackers can exploit this vulnerability remotely, including through guest accounts, by leveraging the lack of size verification logic and using large-sized f_idx inputs in download_mgr.cgi.

Mitigation and Prevention

Protecting systems from CVE-2019-18930 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable guest accounts if not essential for system operation.
Implement network segmentation to limit access to vulnerable devices.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.

Patching and Updates

Apply patches provided by Western Digital promptly to address the vulnerability and enhance system security.