The remote host is missing an update to qemu announced via advisory DSA 1799-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201799-1

Several vulnerabilities have been discovered in the QEMU processor emulator. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2008-0928 Ian Jackson discovered that range checks of file operations on emulated disk devices were insufficiently enforced. CVE-2008-1945 It was discovered that an error in the format auto detection of removable media could lead to the disclosure of files in the host system. CVE-2008-4539 A buffer overflow has been found in the emulation of the Cirrus graphics adaptor. For the old stable distribution (etch), these problems have been fixed in version 0.8.2-4etch3. For the stable distribution (lenny), these problems have been fixed in version 0.9.1-10lenny1. For the unstable distribution (sid), these problems have been fixed in version 0.9.1+svn20081101-1. We recommend that you upgrade your qemu packages.