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McAfee is promising to patch a vulnerability in its hosted anti-malware service after it found a flaw that allowed systems where the product was installed to be turned into potential spam-relay nodes.

SaaS for Total Protection, the vulnerable software, will be patched on "January 18 or 19, as soon as we have finished testing", McAfee promised in a blog post published on Wednesday.

The spam-relay problem resulted in genuine inconvenience for some McAfee customers, whose email was blocked after their IP addresses appeared on blacklists, prompting complaints to McAfee's forums and blog posts on the issue (here and here).

McAfee said the first bug is already blocked by a patch it released to address a similar problem last August. However the second spam-relaying bug still needs some attention, hence the plan to release a server-side patch this week. Since SaaS for Total Protection is a managed product, customers will not be obliged to update their software themselves.

In its blog post, the security giant said that neither of the two security issues placed customer data at any risk of exposure. Its notice explains the impact of the spam-relay flaw, which has been actively abused by spammers.

"The second issue has been used to allow spammers to bounce off of affected machines, resulting in an increase of outgoing email from them," it said. "Although this issue can allow the relaying of spam, it does not give access to the data on an affected machine. The forthcoming patch will close this relay capability."

McAfee says both the issues are restricted to SaaS for Total Protection and don't affect any of its other products.

Old-school scammers used to search the net for open relays through which they might be able to send junk mail before the botnets became the preferred technique for sending junk mail around 10 years ago. Using zombie drones to spew spam is so much easier for crooks, because of the large number of tools that have been developed to automate the process. These tools allow junk mail to be sent out in burst through different machines, rather than the same open relay, a tactic that runs circles around less sophisticated spam-filtering techniques.

Perhaps recent botnet takedowns have prompted spammers to return to older techniques but our guess is that the McAfee spam relay flaw is something of a one-off, opportunistically seized upon and exploited by a small number of spammers. ®

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