CVE-2019-1701 Explained : Impact and Mitigation

Cisco Adaptive Security Appliance and Firepower Threat Defense Software have vulnerabilities in their WebVPN service that could lead to cross-site scripting attacks.

Understanding CVE-2019-1701

Multiple weaknesses in the WebVPN service of Cisco ASA and FTD Software could allow a remote attacker to execute a cross-site scripting attack.

What is CVE-2019-1701?

The vulnerabilities in Cisco ASA and FTD Software's WebVPN service could enable an authenticated attacker to launch a cross-site scripting attack against a user, potentially leading to the execution of arbitrary script code.

The Impact of CVE-2019-1701

The vulnerabilities could allow an attacker to run malicious scripts in the context of the affected interface or access sensitive information stored in the user's web browser.

Technical Details of CVE-2019-1701

Vulnerability Description

The weaknesses stem from inadequate validation of user input on the affected devices, specifically in the WebVPN service.

Affected Systems and Versions

Cisco Adaptive Security Appliance (ASA) Software versions less than 9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17
Cisco Firepower Threat Defense (FTD) Software versions less than 6.2.3.12, 6.3.0.3

Exploitation Mechanism

Attacker needs to manipulate a user into clicking on a specially crafted link to exploit the vulnerabilities.

Mitigation and Prevention

Immediate Steps to Take

Cisco recommends updating to fixed software versions to mitigate the vulnerabilities.
Monitor the Cisco Security Advisories for any updates or patches related to these vulnerabilities.

Long-Term Security Practices

Regularly review and apply security best practices for network devices.
Educate users about the risks of clicking on unknown or suspicious links.

Patching and Updates

Apply the necessary patches provided by Cisco to address the vulnerabilities in the affected software versions.