Software Engineering Institute

The SISCO OSI stack is a component of the SISCO MMS-EASE, ICCP Toolkit for MMS-EASE, AX-S4 MMS and AX-S4 ICCP products. The SISCO OSI stack fails to properly handle malformed packets. A remote attacker may be able to trigger this vulnerability by sending a specially crafted series of packets to a vulnerable SISCO OSI stack installation.

Note that a valid connection is needed to trigger this vulnerability.

The SISCO OSI stack is used in a wide variety of control system applications. Users should check their applications to ensure they are using a non-vulnerable version of the SISCO OSI stack. Users are encouraged to contact their software vendors if they suspect they are vulnerable.

A remote attacker can cause the OSI stack to terminate abnormally resulting in a denial-of-service condition requiring an application using the SISCO OSI stack and the SISCO OSI stack itself to be restarted.

Upgrade or Patch accordingly
SISCO has corrected this problem in the latest version of the SISCO OSI stack. SISCO has also released patches to address this issue in older versions of the SISCO OSI stack for Windows.

Restrict Access

Restrict remote access to only trusted hosts by using firewalls or only connecting them to private networks.