A problem has been discovered in Interchange, an e-commerce and general HTTP database display system, which can lead to an attacker being able to read any file to which the user of the Interchange daemon has sufficient permissions, when Interchange runs in "INET mode" (internet domain socket). This is not the default setting in Debian packages, but configurable with Debconf and via configuration file. We also believe that this bug cannot exploited on a regular Debian system.
This problem has been fixed by the package maintainer in version 220.127.116.1120306-1.woody.1 for the current stable distribution (woody) and in version 4.8.6-1 for the unstable distribution (sid). The old stable distribution (potato) is not affected, since it doesn't ship the Interchange system.
We recommend that you upgrade your interchange packages.