The remote host is missing an update to bugzilla announced via advisory DSA 173-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20173-1

The developers of Bugzilla, a web-based bug tracking system, discovered a problem in the handling of more than 47 groups. When a new product is added to an installation with 47 groups or more and usebuggroups is enabled, the new group will be assigned a groupset bit using Perl math that is not exact beyond 2^48. This results in the new group being defined with a bit that has several bits set. As users are given access to the new group, those users will also gain access to spurious lower group privileges. Also, group bits were not always reused when groups were deleted. This problem has been fixed in version 2.14.2-0woody2 for the current stable distribution (woody) and will soon be fixed in the unstable distribution (sid). The old stable distribution (potato) doesn't contain a bugzilla package. We recommend that you upgrade your bugzilla package.