The remote host is missing an update to php-net-ping announced via advisory DSA 1949-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201949-1

It was discovered that php-net-ping, a PHP PEAR module to execute ping independently of the Operating System, performs insufficient input sanitising, which might be used to inject arguments (no CVE yet) or execute arbitrary commands (CVE-2009-4024) on a system that uses php-net-ping. For the stable distribution (lenny), this problem has been fixed in version 2.4.2-1+lenny1. For the oldstable distribution (etch), this problem has been fixed in version 2.4.2-1+etch1. For the testing distribution (squeeze), this problem will be fixed soon. For the unstable distribution (sid), this problem has been fixed in version 2.4.2-1.1. We recommend that you upgrade your php-net-ping packages.