msm1267 writes: Attackers have figured out how to use Portmapper, or RPC Portmapper, in reflection attacks where victims are sent copious amounts of responses from Portmapper servers, saturating bandwidth and keeping websites and web-based services unreachable. Telecommunications and Internet service provider Level 3 Communications of Colorado spotted anomalous traffic on its backbone starting in mid-June almost as beta runs of attacks that were carried out Aug. 10-12 against a handful of targets in the gaming and web hosting industries. There are 1.1 million Portmapper servers accessible online, and those open servers can be abused to similar effect as NTP servers were two years ago in amplification attacks.
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