Vincent Bernat discovered that pimd, a multicast routing daemon, creates files with predictable names upon the receipt of particular signals.
For the stable distribution (lenny), this problem has been fixed in version 2.1.0-alpha29.17-8.1lenny1.
The testing distribution (squeeze) and the unstable distribution (sid) will receive updates shortly.
We recommend that you upgrade your pimd packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/