The remote host is missing an update to gallery2 announced via advisory DSA 1404-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201404-1

Nicklous Roberts discovered that the Reupload module of Gallery 2, a web based photo management application, allowed unauthorized users to edit Gallery's data file. The oldstable distribution (sarge) does not contain a gallery2 package. The previous gallery package is not affected by this vulnerability. For the stable distribution (etch) this problem has been fixed in version 2.1.2-2.0.etch.1. For the unstable distribution (sid) this problem has been fixed in version 2.2.3-1. We recommend that you upgrade your gallery2 package.