A buffer overflow has been discovered in ethereal, a commonly used network traffic analyser that causes a denial of service and may potentially allow the execution of arbitrary code.
For the old stable distribution (woody) this problem has been fixed in version 0.9.4-1woody14.
For the stable distribution (sarge) this problem has been fixed in version 0.10.10-2sarge3.
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you upgrade your ethereal packages.