December 3, 2020 – Alert: Possible System Hang Using Windows Telnet with SSL/TLS

InterSystems has corrected a defect that may cause Windows Telnet processes that are secured using SSL/TLS to hang indefinitely; this may then cause an instance to become unresponsive. This defect is present only on Windows platforms.

This defect affects:

  • Caché and Ensemble 2018.1.4
  • HealthShare Health Connect (HSAP) 15.032 built on C/E 2018.1.4
  • InterSystems IRIS and InterSystems IRIS for Health 2020.3

The problems caused by this defect can occur only when the instance is running Windows Telnet. Because Telnet is disabled by default, your system is susceptible to this defect only if it runs on Windows and you have explicitly enabled %Service_Telnet. For more information about that service and how to check if it is enabled, see the “Services” section of the security documentation.

The correction for this defect is identified as SOH724 and will be included in all future product releases. It is also available via Ad hoc distribution from the InterSystems Worldwide Response Center (WRC).

If you have any questions regarding this alert, please contact the Worldwide Response Center.