CVE-2023-31473 : Security Advisory and Response

An issue was discovered on GL.iNet devices before 3.216. There is an arbitrary file write in which an empty file can be created anywhere on the filesystem. This is caused by a command injection vulnerability with a filter applied. Through the software installation feature, it is possible to inject arbitrary parameters in a request to cause opkg to read an arbitrary file name while using root privileges. The -f option can be used with a configuration file.

Understanding CVE-2023-31473

GL.iNet devices prior to version 3.216 are susceptible to an arbitrary file write vulnerability, allowing the creation of empty files across the filesystem through a command injection flaw.

What is CVE-2023-31473?

CVE-2023-31473 refers to a security issue present in GL.iNet devices before version 3.216, enabling attackers to create empty files anywhere on the filesystem due to a command injection vulnerability.

The Impact of CVE-2023-31473

The arbitrary file write exploit in GL.iNet devices can lead to unauthorized creation of files, potentially allowing malicious entities to manipulate system configurations and gain unauthorized access.

Technical Details of CVE-2023-31473

In-depth technical information regarding the vulnerability in GL.iNet devices.

Vulnerability Description

The vulnerability allows for the arbitrary creation of empty files via a command injection flaw, triggered by injecting parameters through the software installation feature.

Affected Systems and Versions

GL.iNet devices before version 3.216 are affected by this vulnerability, exposing them to potential exploitation.

Exploitation Mechanism

Attackers can exploit this issue by injecting arbitrary parameters through software installation requests, tricking the system into creating empty files in various locations with root privileges.

Mitigation and Prevention

Effective strategies to mitigate the risks posed by CVE-2023-31473.

Immediate Steps to Take

Update GL.iNet devices to version 3.216 or higher to eliminate the arbitrary file write vulnerability.
Monitor system logs for any unusual file creation activities.

Long-Term Security Practices

Implement strict input validation to prevent command injection attacks in the future.
Regularly review and update security configurations to address emerging threats.

Patching and Updates

Stay informed about security patches and updates provided by GL.iNet to address known vulnerabilities and enhance device security.