Example Fail2Ban/iptables script which installs automatic protection on Centos/Red Had system can be found here. These tools are very convenient and easy to use. We recommend using Fail2Ban with iptables on Linux servers to block the attackers. If you notice an IP unsuccessfully registering several times within a short time span, you can configure your protection to ban the IP temporarily or forever. You should permanently block the following properties: You can also block SIP messages for the User-Agent property associated with the exploit. But that’s often easier said than done, and it may be hard to configure VoIP clients using non-standard ports. Because SIP clients often connect dynamically via cable modems and other IP-changing networks, locking down IP access usually isn’t feasible.īecause friendly-scanner finds its way into your network through port 5060, changing the port number to a different port would stop it right in its tracks. In reality, many SIP clients don’t have static IPs. Hackers like to make things easier for themselves.īlocking the attack Blocking the Attacker’s IP Addressesįirewall policies that deny all and only allow by exception are great in theory. Signs of a SIP server attack include problems registering/connecting your phones, extremely slow network connections, and continual heavy use of bandwidth (which can be seen when reviewing your firewall logs).įriendly-scanner attacks often occur when the network is least likely to be monitored, such as nights or holidays. If how much you pay is based on how much traffic you generate, you’ll be hit with a hefty bill. This can last for hours, days, or even weeks, wreaking havoc on your bandwidth use. Friendly-scanner can probe your network once every few hours or go into full-blown DoS mode, sending more than 80 SIP REGISTER requests per second. This demo video shows you how a hacker executes a friendly-scanner attack.Ī successful hack into your Softswitch can quickly overload your network. The valid accounts are later used for fraudulent purposes, such as making free international calls. If it finds the port open, it attempts to brute force its way into your SIP server by testing sequential SIP account numbers with common usernames/passwords. It scans IP ranges for SIP servers such as softswitches or PBXs, which communicate via the 5060 port. This blog post discusses one of the most popular SIP attacks and how to arm yourself against it.įriendly-scanner (which isn’t really friendly at all) is a type of botnet. But panicking will not help! Instead, it’s important to understand the security aspects of VOIP so you can properly defend your servers from ruthless hackers and script kiddies. These attacks can lead to tons of downtime and lost money. Check it out here!ĭid you know if you join the Macy’s Registry Rewards Program, you will receive 10% back with every purchase made using your Macy’s card and 5% back for every gift purchased off of your registry? And, after your wedding, Macy’s will send you a Rewards Card with the accumulated balance to spend on ANYTHING your heart desires! How awesome is that?įor more information, visit, and make sure to like Macy’s on Facebook, /macys.īlog post by Real Weddings Magazine’s Social Media Maven, Aimee Carroll.As a new VOIP startup, you may find your SIP server under attack one day. at Macy’s Roseville Galleria in RosevilleĪttendees will receive an incredible goodie bag (including a FREE copy of Real Weddings Magazine).Īdmission is free, but please RSVP by calling or emailing to reserve your spot - click here for the information to RSVP!ĭo you prefer to register online? No problem, Macy’s offers a fabulous registry guide with helpful tools and useful tips to help you every step of the way. Join Macy’s Wedding & Gift Registry for an event featuring fun beverages, hors d’oeuvres, and great registry experts to help you create your dream registry. Pick up a FREE copy of Real Weddings Magazine and get the star treatment at Macy’s Sip & Scan Registry Event THIS THURSDAY!
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