At its simplest, where a software company sends out a small piece of code that must be transplanted into the body of the ailing software, patching takes a few moments. This doesn't scale well. Ask anyone responsible of late for collections of Windows machines, as soon as there are multiple machines with multiple configurations, even deploying and checking a single patch can take a long time. When there are multiple patches, patch management threatens to become a full-time job. And multiple patches are becoming the norm: the CERT security advisory team reported over 4,000 vulnerabilities in 2002, fuelling a veritable industry of patching that is variously estimated to cost businesses and governments up to $1.5bn worldwide.
The link for this article located at ZDNet.co.uk is no longer available.