The LOB functionality in PEAR MDB2 before 2.5.0a1 interprets a request to store a URL string as a request to retrieve and store the contents of the URL, which might allow remote attackers to use MDB2 as an indirect proxy or obtain sensitive information via a URL into a form field in an MDB2 application, as demonstrated by a file:// URL or a URL for an intranet web site.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2007-5934)