EMC's RSA Security division says the security of the company's two-factor SecurID tokens could be at risk following a sophisticated cyber-attack on the company.
In an advisory published on the company's website, RSA executive chairman Art Coviello said his company is "actively communicating this situation to RSA customers and providing immediate steps for them to take to strengthen their SecurID implementations."
"While at this time we are confident that the information extracted does not enable a successful direct attack on any of our RSA SecurID customers, this information could potentially be used to reduce the effectiveness of a current two-factor authentication implementation as part of a broader attack," Coviello said.
Coviello's note offered few details on what happened, but it has offered some guidance for customers.
The cyber-attack was "recent" and was a so-called Advanced Persistent Threat incident, Coviello said. This is the type of attack that compromised systems at Google and as many as 100 other companies in late 2009. Hackers use email- or web-based attacks to get a foothold in the company and then move about the company's internal networks looking for sensitive data to sneak out.
In this case, the hackers found information on RSA's SecurID products - which are used on PCs, USB devices, phones and key fobs in about 25,000 corporations to provide an extra layer of security beyond a username and password for people logging into programs or networks.
Having access to RSA's internal networks and the SecurID source code might give criminals a subtle way of attacking SecurID users, but it shouldn't give them a way of completely breaking RSA's encryption, said Thorsten Holz, an assistant professor at Ruhr-University Bochum who studies computer security.
"If RSA implemented everything correctly, nobody should be worried too much," he said.
However, from RSA's statement, it's not clear exactly what the hackers were able to learn from the company network.
According to Nate Lawson, a cryptographer and the founder of Root Labs, there's simply not enough information available to tell how bad the problem really is. "If I was a customer of theirs it makes it really hard to know what I need to do. They recommend a lot of things that people are already doing," he said.
RSA representatives did not immediately return calls and emails seeking comment.
No EMC products were affected by the attack and RSA doesn't think other RSA products are affected. Also, there's no evidence that customer or employee information was compromised, Coviello said.
EMC's stock [EMC] was down 1.25 percent in after-hours trading following the news. In a regulatory filing, EMC said it "does not believe that the matter described in the letter and note will have a material impact on its financial results."