Cisco Unified Contact Center Express CVE-2019-15259 HTTP Response Splitting Vulnerability

Description

Cisco Unified Contact Center Express is prone to an HTTP response-splitting vulnerability. Attackers can leverage this issue to influence or misrepresent how web content is served, cached, or interpreted. This could aid in various attacks that try to entice client users into having a false sense of trust. This issue is being tracked by Cisco Bug ID CSCvr21771.

Technologies Affected

• Cisco Unified Contact Center Express 10.0(1)
• Cisco Unified Contact Center Express 10.5(1)
• Cisco Unified Contact Center Express 10.6(1)
• Cisco Unified Contact Center Express 11.0(1)
• Cisco Unified Contact Center Express 11.5 SU1
• Cisco Unified Contact Center Express 11.5(1.10000.61)

Recommendations

Block external access at the network boundary, unless external parties require service.
Block external access at the network boundary, unless external parties require service. Filter access to the affected computer at the network boundary if global access isn’t needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
Attackers may successfully exploit client flaws in the browser through cross-site scripting vulnerabilities. When possible, run client software as regular user accounts with limited access to system resources. This may limit the immediate consequences of client-side vulnerabilities.

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 including 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.

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