Brian Caswell discovered that an improperly formatted SMB packet could make ethereal hang and eat CPU endlessly.
For the stable distribution (woody) this problem has been fixed in version 0.9.4-1woody9.
For the unstable distribution (sid) this problem has been fixed in version 0.10.8-1.
We recommend that you upgrade your ethereal packages.
MD5 checksums of the listed files are available in the original advisory.