An Ethreal Security Advisories reports:
Issues have been discovered in the following protocol dissectors:
Matthew Bing discovered a bug in DICOM dissection that could make Ethereal crash. An invalid RTP timestamp could make Ethereal hang and create a large temporary file, possibly filling available disk space. The HTTP dissector could access previously-freed memory, causing a crash. Brian Caswell discovered that an improperly formatted SMB packet could make Ethereal hang, maximizing CPU utilization.
Impact: It may be possible to make Ethereal crash or run arbitrary code by injecting a purposefully malformed packet onto the wire or by convincing someone to read a malformed packet trace file.