CVE-2019-12668 : Security Advisory and Response

A stored cross-site scripting (XSS) vulnerability in Cisco IOS and IOS XE Software could allow an authenticated remote attacker to execute arbitrary script code or gain unauthorized access to sensitive information.

Understanding CVE-2019-12668

This CVE involves a flaw in the web framework code of Cisco IOS and IOS XE Software that could be exploited for a stored XSS attack.

What is CVE-2019-12668?

The vulnerability arises from inadequate validation of banner parameters in the software's web server, enabling an attacker to inject malicious code into the affected web interface.

The Impact of CVE-2019-12668

If successfully exploited, the attacker could execute arbitrary script code within the web interface's context or access sensitive browser-based information.

Technical Details of CVE-2019-12668

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The flaw allows an authenticated remote attacker to conduct a stored XSS attack using the banner parameter in the affected software's web interface.

Affected Systems and Versions

Product: Cisco IOS XE Software 3.6.0E
Vendor: Cisco
Version: Unspecified

Exploitation Mechanism

Attacker crafts a customized banner parameter and saves it
Persuades a user to access a malicious link or intercepts their request to inject malicious code

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches and updates promptly
Educate users on identifying and avoiding suspicious links

Long-Term Security Practices

Implement strict input validation mechanisms
Regularly monitor and audit web interfaces for unusual activities

Patching and Updates

Refer to the vendor's security advisory for specific patch details and instructions