CVE-2019-8315 : What You Need to Know

A Command Injection vulnerability on D-Link DIR-878 devices running firmware 1.12A1 allows remote attackers to execute unauthorized code and gain root shell access.

Understanding CVE-2019-8315

This CVE involves a critical security issue that enables attackers to manipulate HNAP1 POST requests to execute arbitrary OS commands.

What is CVE-2019-8315?

The vulnerability in D-Link DIR-878 devices with firmware 1.12A1 allows remote attackers to exploit a Command Injection flaw to execute unauthorized code and obtain root shell access.

The Impact of CVE-2019-8315

Remote attackers can execute arbitrary operating system commands on affected devices.
Unauthorized access to the system can lead to data theft, manipulation, or disruption of services.

Technical Details of CVE-2019-8315

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises when the SetIPv4FirewallSettings API function calls the twsystem function using untrusted input from the request body, allowing the execution of arbitrary OS commands.

Affected Systems and Versions

D-Link DIR-878 devices running firmware version 1.12A1 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating HNAP1 POST requests to trigger the execution of arbitrary OS commands, specifically by inserting shell metacharacters into certain fields.

Mitigation and Prevention

Protecting systems from CVE-2019-8315 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the firmware of D-Link DIR-878 devices to the latest version that includes a patch for this vulnerability.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and mitigate potential weaknesses.
Educate users and administrators about safe computing practices and the importance of cybersecurity.

Patching and Updates

Ensure that all devices running D-Link DIR-878 firmware are updated with the latest patches to mitigate the Command Injection vulnerability.