CVE-2018-20503 : Security Advisory and Response

Allied Telesis 8100L/8 devices have a vulnerability that allows XSS through specific parameters.

Understanding CVE-2018-20503

This CVE involves a cross-site scripting (XSS) vulnerability in Allied Telesis 8100L/8 devices when certain parameters are used.

What is CVE-2018-20503?

The devices of Allied Telesis 8100L/8 have a vulnerability that enables XSS when using the edit-ipv4_interface.php vlanid or subnet_mask parameter.

The Impact of CVE-2018-20503

This vulnerability can be exploited by attackers to execute malicious scripts in the context of a user's browser, potentially leading to various attacks such as data theft, session hijacking, or defacement.

Technical Details of CVE-2018-20503

This section provides more in-depth technical information about the CVE.

Vulnerability Description

Allied Telesis 8100L/8 devices allow XSS via the edit-ipv4_interface.php vlanid or subnet_mask parameter.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Version: n/a

Exploitation Mechanism

The vulnerability can be exploited by injecting malicious scripts into the vlanid or subnet_mask parameter, which are not properly sanitized by the device.

Mitigation and Prevention

Protecting systems from CVE-2018-20503 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable access to the vulnerable parameters if not essential.
Implement input validation to sanitize user inputs.
Regularly monitor and analyze network traffic for any suspicious activities.

Long-Term Security Practices

Keep systems and software updated with the latest security patches.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Check for patches or updates released by Allied Telesis to address the XSS vulnerability.