epan/dissectors/packet-rdp.c in the RDP dissector in Wireshark 1.8.x before 1.8.8 does not validate return values during checks for data availability, which allows remote attackers to cause a denial of service (application crash) via a crafted packet.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.