The remote host is missing an update to pstotext announced via advisory DSA 1220-1. Brian May discovered that pstotext, a utility to extract plain text from Postscript and PDF files, performs insufficient quoting of file names, which allows execution of arbitrary shell commands.

For the stable distribution (sarge) this problem has been fixed in version 1.9-1sarge2. The build for the mipsel architecture is not yet available due to technical problems with the build host. For the upcoming stable distribution (etch) this problem has been fixed in version 1.9-4. For the unstable distribution (sid) this problem has been fixed in version 1.9-4. We recommend that you upgrade your pstotext package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201220-1