Digital Defense, Inc. has alerted the Samba Team to a serious vulnerability in, a LanManager-like file and printer server for Unix. This vulnerability can lead to an anonymous user gaining root access on a Samba serving system. An exploit for this problem is already circulating and in use.
Since the packags for potato are quite old it is likely that they contain more security-relevant bugs that we know of. You are therefore advised to upgrade your systems running Samba to woody soon.