The remote host is missing an update to qemu announced via advisory DSA 1657-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201657-1

Dmitry E. Oboukhov discovered that the qemu-make-debian-root script in qemu, fast processor emulator, creates temporary files insecurely, which may lead to a local denial of service through symlink attacks. For the stable distribution (etch), this problem has been fixed in version 0.8.2-4etch2. For the testing (lenny) and unstable distribution (sid), this problem has been fixed in version 0.9.1-6. We recommend that you upgrade your qemu package.