The remote host is missing an update to aria2 announced via advisory DSA 2047-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202047-1

A vulnerability was discovered in aria2, a download client. The name attribute of the file element of metalink files is not properly sanitised before using it to download files. If a user is tricked into downloading from a specially crafted metalink file, this can be exploited to download files to directories outside of the intended download directory. For the stable distribution (lenny), this problem has been fixed in version 0.14.0-1+lenny2. For the unstable distribution (sid), this problem has been fixed in version 1.9.3-1. We recommend that you upgrade your aria2 package.