December 19, 2019
Telos AMHS is prone to multiple cross-site scripting vulnerabilities and an information-disclosure vulnerability. An attacker may leverage these issues to obtain sensitive information or execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials or gain access to sensitive information. Versions prior to Telos Automated Message Handling System (AMHS) 188.8.131.52 are vulnerable.
- Telos Amhs
Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits
Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to detect and block attacks and anomalous activity such as requests containing suspicious URI sequences. Since the webserver may log such requests, review its logs regularly.
Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.
Since exploiting cross-site scripting issues often requires the execution of malicious script code in web clients, 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 websites that rely on the execution of browser-based script code.
When possible, limit the privileges granted to users to the least amount required.
Ensure that all users are granted the least amount of privileges required to successfully operate.
Updates are available. Please see the references or vendor advisory for more information.
CERT Coordination Center
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