ASA-2019-00499 – Wind River VxWorks: Denial of Service (DoS) via NULL dereference in IGMP parsing

This vulnerability require that the TCP/IP-stack is assigned a multicast address the API intended for assigning unicast addresses or something with the same logical flaw is a prerequisite. This vulnerability requires that at least one IPv4 multicast address has been assigned to the target in an incorrect way, i.e., using the API intended for assigning unicast addresses. It is not possible to exploit for multicast addresses added with the proper API, i.e., setsockopt(). An attacker may use CVE-2019-12264 to incorrectly assign a multicast IP address. An attacker on the same LAN as the victim system may use this vulnerability to cause a NULL pointer dereference, which most likely will crash the tNet0 task.