The remote Debian host is missing a security-related update.
It was discovered that libsoup, a HTTP library implementation in C, is not properly validating input when processing requests made to SoupServer. A remote attacker can exploit this flaw to access system files via a directory traversal attack.
Upgrade the libsoup2.4 packages. For the oldstable distribution (lenny), this problem has been fixed in version 2.4.1-2+lenny1. For the stable distribution (squeeze), this problem has been fixed in version 2.30.2-1+squeeze1.