Multiple Cisco Products CVE-2019-12695 Cross Site Scripting Vulnerability

Description

Multiple Cisco Products are prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected device. This may allow the attacker to steal cookie-based authentication credentials and launch other attacks. This issue is being tracked by Cisco Bug ID CSCvp33341.

Technologies Affected

• Cisco Adaptive Security Appliance Software 9.10
• Cisco Adaptive Security Appliance Software 9.12
• Cisco Adaptive Security Appliance Software 9.13
• Cisco Adaptive Security Appliance Software 9.4.1
• Cisco Adaptive Security Appliance Software 9.5.1
• Cisco Adaptive Security Appliance Software 9.6
• Cisco Adaptive Security Appliance Software 9.7(1)
• Cisco Adaptive Security Appliance Software 9.8
• Cisco Adaptive Security Appliance Software 9.9
• Cisco Firepower Threat Defense Software (FTD) 6.1.0
• Cisco Firepower Threat Defense Software (FTD) 6.2.0
• Cisco Firepower Threat Defense Software (FTD) 6.2.1
• Cisco Firepower Threat Defense Software (FTD) 6.2.2
• Cisco Firepower Threat Defense Software (FTD) 6.2.3
• Cisco Firepower Threat Defense Software (FTD) 6.3.0
• Cisco Firepower Threat Defense Software (FTD) 6.4.0

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, block access at the network perimeter to computers hosting the vulnerable device.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity such as unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to websites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Set web browser security to disable the execution of JavaScript.
Since exploiting cross-site scripting issues often requires malicious script code to run in browsers, consider disabling script code and active content support within a client browser as a way to prevent a successful exploit. Note that this mitigation tactic might adversely affect legitimate sites that rely on the execution of browser-based script code.

Updates are available. Please see the references or vendor advisory for more information.