CVE-2017-16953 : Security Advisory and Response

CVE-2017-16953 was published on December 1, 2017, and affects ZTE ZXDSL 831CII devices. The vulnerability allows remote attackers to modify the PPPoE configuration or execute a malicious configuration by exploiting the connoppp.cgi function.

Understanding CVE-2017-16953

This CVE entry highlights a security flaw in ZTE ZXDSL 831CII devices that lack HTTP Basic Authentication, enabling unauthorized access and potential configuration modifications by remote attackers.

What is CVE-2017-16953?

The connoppp.cgi function on ZTE ZXDSL 831CII devices does not utilize HTTP Basic Authentication, allowing remote attackers to exploit the vulnerability by sending a GET request to modify the PPPoE configuration or execute a malicious configuration.

The Impact of CVE-2017-16953

The vulnerability poses a significant risk as attackers can gain unauthorized access to the device and potentially manipulate critical network configurations, leading to service disruptions or unauthorized access.

Technical Details of CVE-2017-16953

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The connoppp.cgi function on ZTE ZXDSL 831CII devices lacks HTTP Basic Authentication, enabling remote attackers to modify PPPoE configurations or set up malicious configurations via a GET request.

Affected Systems and Versions

Product: ZTE ZXDSL 831CII
Vendor: ZTE
Versions: All versions are affected

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a GET request to the connoppp.cgi function, bypassing the lack of HTTP Basic Authentication and gaining unauthorized access to modify configurations.

Mitigation and Prevention

Protecting systems from CVE-2017-16953 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable remote access to vulnerable devices if not required
Implement strong firewall rules to restrict unauthorized access
Monitor network traffic for any suspicious activities

Long-Term Security Practices

Regularly update device firmware to patch known vulnerabilities
Conduct security audits to identify and address potential weaknesses
Educate users on secure configuration practices and the risks of unauthorized access

Patching and Updates

Check for security advisories from ZTE regarding patches for the vulnerability
Apply recommended patches promptly to secure the devices against potential exploits