By Tom Espiner (ZDNet UK)
 XenSource and VMware, two major figures in virtualisation security have warned of challenges facing IT managers in implementing secure virtual environments.
Speaking at the RSA Conference in San Francisco last week, Simon Crosby, chief technology officer for XenSource, said security policies could be broken by misconfiguration.
"Virtualisation can challenge an IT organisation's infrastructure, which suddenly becomes dynamic," said Crosby. "You can shift a workload from server A to server B, but if the security policy doesn't follow, [virtualisation] has broken it. That's a challenge."

http://www.builderau.com.au/news/soa/Virtualisation-security-threatened-XenSource/0,339028227,339288228,00.htm