Companies that have not installed a Microsoft server security patch against a flaw in Windows Internet Naming Services (Wins) are increasingly coming under attack.
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Both the SANS Institute Internet Storm Centre and the Research and Education Networking Information Sharing and Analysis Centre (REN-ISAC) in the US have reported increased attempts to enter networks using the flaw.
Wins, when unprotected, allows hackers to identify the IP addresses of individual computers on a shared network, to ease exploits.
Both reporting centres have warned that hacker activity around the flaw has rapidly increased since the turn of the year.
SANS said on its website, "We and other organisations have seen a marked increase in the probes directed at Wins services since 31 December.
"Patching these systems is now overdue. Additionally, Wins services probably should not cross your border router. So please block these ports and keep the hackers out."
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