It has been reported that arts uses the insecure mktemp() function to create the temporary directory it uses to host user-specific sockets. It is thus possible for another user to hijack this temporary directory and gain IPC access it should not have.
In Debian 6 Squeeze, this issue has been addressed in arts 1.5.9-3+deb6u1 with the use of the safer mkdtemp() function. We recommend that you upgrade your arts packages.
Other Debian releases do not have the arts package.