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1、网络安全攻防新闻一则10月18日:Belgacom investigates router compromise at its carrier services armUndersea cables:160 countries 700 operatorsOn Sept.16,Belgacom announced it had discovered a previously unknown virus on some of its internal systems.GCHQ code-named Operation Socialist.“An investigation found change
2、s to the router software that most likely resulted from the intrusion reported in September旧闻一则.cn事件网易科技讯 8月25日消息,今天凌晨,.CN的根服务器因受到攻击发生故障,大面积CN域名均无法解析,凌晨4点左右.cn根服务器恢复正常。工信部:峰值流量较平常激增近1000倍WSJ:CloudFlare observed a 32%drop in traffic for the thousands of Chinese domains on the companys network during
3、the attack compared with the same time 24 hours earlier.botnet直接直接向6个.cn根域名查询某私服网址旧闻一则.cn的攻击流量由多大?最大的根 L 的数据(anycast全球146个点)25000q/s=12Mb/s inbound挑战1 VisibilityRight now,你能说得清楚你的网络是个什么状况么?流量是怎么回事?Span+7层分析=Visibility?签名问题告诉我你要看啥管中窥豹更进一步的逻辑和关系?挑战1最简单的四元组分析如果不知道要看啥的时候你愿意看这个?挑战1最简单的四元组分析还是这个?挑战1挑战1Umb
4、rella的一个可视化展示挑战1基于不同数据的多视角的可视化的关系关联是未来?挑战2 网络方面网络本身安全么?国内的网络设备加固文档禁用telnet,开启ssh关闭echo,chargen,proxy-arp等服务网络方面网络设备加固的核心任务是啥?保护control|management plane网络方面路由器Data(forwarding)plane流量分布式专用硬件(ASIC)高性能,不向上 e.g.CRS-3 2.2Tbit/s max 322Tbit/sControl|Management planeProtocl makes the network|router run bgp|
5、ospf|ssh|snmp|arp|icmp erroretc软件实现,普通CPU性能|功能(后门等如暗藏帐号)NSA backdoor?你是攻击者你选谁?网络方面Step back来看一看最火的抗D场景网络方面历史上最大的ddos攻击Cloudflare流量Amazon+Wikipedia+Twitter+Instagram+Apple每分钟日志数据是20G,28800G/d global anycast,edge flowspec网络方面历史上最大的ddos攻击事件回放3月中 cyberbunker spamhaus3月20 cyberbunker cloudflare spamhaus
6、3月23 cyberbunker cloudflare spamhaus 攻击者获取了大部分的cloudflare peering exchange点IPcyberbunker ISP cloudflare spamhaus网络方面历史上最大的ddos攻击网络方面历史上最大的ddos攻击网络方面腾讯 网络方面国内某著名抗D专业公司traceroute网络方面国内某著名抗D专业公司网络方面更进一步抗攻击手段Big players google,amazonetc如何做的?他们有个“total solution”boxCost$1M除了抗D外,还可以以线速接员工上下班抗攻击手段如果你想抵抗各种攻击
7、,同时对网络影响最小,你需要针对你的环境采用layered的defense没有siliver bullet,发挥各种“平淡无奇”的技术到极致抗攻击手段网络层面ACL BGP is your friendFlowspecMPLS+Flowspec未来 SDNAnycastbogon其他trickControl plane保护免费darknet没有payload没用锤子 钉子?layer3 layer4 layer7抗攻击手段参考Google的内部标准value packets/second bits/second http queries/second IPs抗攻击手段ACL 在接入层面的3,4
8、层快速过滤功能iACL抗攻击手段BGP(routing protocol)is your friendBGP to the rack(facebook)BGP blackhole(SRC based DST based)Diagram from 抗攻击手段BGP(routing protocol)is your friendCT Dst rtbhCT has loose urpf enabled,so it can do Src rtbh抗攻击手段FlowspecACL on steroidLayer4 infoUse bgp control plane to distribute ACLBe
9、nefits are hugeUse BGP to distribute flow specification filters and dynamically take action(drop,sampling,redirect)on routers.Supported by Juniper and AlcatelFast:ACL propgate via bgp advertisementWe can block traffic by src|dst ip,src|dst port,packet size,protocol,tcp flags,icmp 他type|code.and any
10、of the combinationAmazon,cloudflare,google?Goolge is moving into SDN world抗攻击手段MPLS+FlowspecI want to see the payload!You have to redirect traffic if you want to see l7牵引+tunnelchinabyte网图抗攻击手段MPLS+Flowspec貌似本人是第一个用这个手段来做的,今年5月份nanog才有人做这一技术报告Traffic redirect:We can redirect matched traffic(we can c
11、ollect any traffic from any interface on any peering router and get it sent to our collector)具体内容flowspec ppt.pdf http:/ sample config.pdf http:/ benefit抗攻击手段AnycastMagic!Everybody likes it,life is good after thatReally?How which uses anycast蝗虫Attack comes,moves away,comes back again,moves away agai
12、nBgp withdrawn,advertise,withdrawn,advertiseControl how far it goes抗攻击手段BogonTeam cymru抗攻击手段其他trickE.g.抗攻击手段其他trickE.g.抗攻击手段其他trickE.g.双IP DNS server白名单+TTL抗攻击手段保护control planeCore hiding Dont redistribute connected设计合理的内部ip段(loopbacks,interface ips)bgp null抗攻击手段保护control plane依然有问题脆弱的Chain抗攻击手段保护co
13、ntrol plane脆弱的Chain:Peeringdb抗攻击手段保护control plane脆弱的Chain:Bgp looking glass抗攻击手段DarknetExpensive!?Not reallyNobody should touch your infrasturcureNobody should touch your unused Ips抗攻击手段Darknet抗攻击手段Darknet抗攻击手段Darknet see 15169 there?抗攻击手段Darknet最后合作合作企业和企业,企业和运营商,运营商和运营商一个人一个企业走不远Security community演讲完毕,谢谢观看!