Online scammers are exploiting a redirection script on Barclays' site to make fraudulent emails look more convincing. An alertReg reader noticed the trick in scam emails he received.

We have yet to hear back from the bank, despite notifying Barclays of a potential problem last Tuesday (8 August). Meanwhile, the exploit (details of which we are withholding) remains open to abuse.

A similar attack, again ostensibly pointing to Barclays' website, but in reality directing surfers towards a phishing net, has been reported by other fraud watchers (seehere). The other scams detailed by anti-phishing website MillerSmiles have a URL that more obviously points to something that's nothing to do with the targeted organisation (examplehere).

Our reader describes how the tactics used in the Barclays scam might trap the unwary: "Barclays Bank's website has a security flaw which will allow a phisher to provide a link which appears to be a legitimate Barclays URL, but actually redirects to fraudulent site. It seems very irresponsible to not do any checking that a URL is internal, or legitimate, before redirecting," he said.

eBay was the target of a similar attack last year. In that case, it took eBay some weeks to address the flaw. We can only hope that Barclays moves quickly to block off the possible route of attack.

Web security firm MessageLabs said redirection attacks that exploit security flaws on target websites are growing in prevalence. "Barclays is not the first. We have stopped several of these attacks in the past year," it said. ®