The gtop daemon, used for monitoring remote machines, contains a buffer overflow which could be used by an attacker to execute arbitrary code with the privileges of the daemon process. If started as root, the daemon process drops root privileges, assuming uid and gid 99 by default.
This bug was previously fixed in DSA-098, but one of the patches was not carried over to later versions of libgtop.
For the stable distribution (woody), this problem has been fixed in version 1.0.13-3.1.
For the old stable distribution (potato), this problem was fixed in DSA-098.
For the unstable distribution (sid), this problem has been fixed in version 1.0.13-4.
We recommend that you update your libgtop package.
MD5 checksums of the listed files are available in the original advisory.