dst inside:192.168.60.33/80 by access-group "tACL-Policy"
Cisco DDoS. Within the sinkhole network, it is advantageous to include tools and devices that can provide monitoring and added visibility into the traffic that is diverted there. Traffic sent to the ASA itself is not considered by Threat Detection. In the following subsections, we cover the types of DDoS attacks, common methodologies and tools used, and the impact of each attack. *0050command to display the related Cisco NetFlow records. For example, if 'number-of-rate' is set to 2, you see all statistics for 20 minutes, 1 hour and 8 hours. Internet Control Message Protocol (ICMP) flood attacks have existed for many years. It usually starts with "The Internet is down. In addition, it is important to know that some of these tools can look into and match specific fields in the packet (for example, source and destination IP, protocol, and length.) DNS is a "background" service we do not often think about, but it is actually used many times each day by every user in every organization. In addition, the defense solution analyzes netflow. The average rate is simply the average number of drops per second within the time period of the configured ARI. Client applications, such as Internet browsers, typically request that the DNS server perform recursion by setting a Recursion Desired (RD) flag in the DNS request packet. Accurately distinguishes legitimate from malicious traffic, enabling advanced SLA and increasing service availability. Develop and manage information security programs, including, information security awareness, vulnerability management, vendor risk management and risk management. In order to configure custom rates for TCP intercept statistics, use the rate-interval, average-rate, and burst-rate keywords. These zombies run a covert channel to communicate with the command-and-control server that the attacker controls. There will be certain situations in which there is simply no substitute for looking at the packets on the wire. When Advanced Threat Detection detects an attack of this nature, the ASA is already protecting the targeted server via TCP intercept. From an attacker on the outside of the ASA (10.10.10.10), use nmap to run a TCP SYN scan against every port on the target server: Note that Threat Detection keeps track of the protected server: Note: In order for Scanning Threat Detection to track the target and attacker IPs, the traffic must be permitted through the ASA. Packet capture can be accomplished on Cisco network devices in a number of ways: A number of open source tools, such as tcpdump, snoop, and Wireshark (http://www.wireshark.org), can drill down into the packet contents from packet captures. Hi Marvin, Let me correct my request, how about basic DOS protection (not DDOS) though . ICMP 11674 0.0 3 61 0.0 19.8 15.5
In order to trigger a particular Basic Threat, refer to the table in the previous Functionality section. ", "Cybercrime is no longer an annoyance or another cost of doing business. NetFlow data can be exported from network devices to a variety of open source and commercial NetFlow Collection tools. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. .000 .001 .256 .000 .010 .000 .000 .000 .000 .000 .000
Proactive solutions and constant monitoring and configuration updates should be the common practice, with manual responses regarded as rare solutions. If the shun is part of a legitimate attack, no further action is required. Subsequently, the resolver contributes to the DDoS attack on spoofed addresses. Only through-the-box threats are detected. The Cisco Cyber Threat Defense Solution is an effective method of collecting and analyzing NetFlow data. For SYN attacks, traffic can be blocked in an ACL on the ASA. If the number of events that occur within the ARI exceeds the configured rate thresholds, the ASA considers these events a threat. 1. Numerous DDoS mitigation technologies do not support decryption of SSL traffic. Explore our flexible deployment options, award-winning service, andindustry-leading service-level agreements (SLAs). In addition, a packet that contains a source address for which the return route points to the Null 0 interface will be dropped. False positives can be expected when using IPS, so not all IPS-related alarms indicate an attack or even unexpected network activity. Networks and network-enabled devices constantly create traffic. The following are a few examples: Low Orbit Ion Cannon and High Orbit Ion Canon. The Cisco DNA subscription licenses are mandatory at the time of configuration. Basic Threat Detection can still trigger a Scanning threat even if the traffic is dropped by an ACL. Two recent examples of unintentional events are theGoDaddy DNS Infastructure outagethat took place in September 2012 and theCloudFlare outagethat occurred in March 2013. The lifecycle described here focuses primarily on the botnet, or a collection of zombie machines reporting to one or more command-and-control (C2) servers. In most cases, these attacks are accomplished by spoofing the attacker's source IP address. The compromised systems are often calledzombies. Although the focus of IDS and IPS is to detect and prevent bad traffic, it is advisable to use the alarms and log messages from these devices as early warning indicators of anomalous, and potentially malicious, traffic in the network. The ASA supports tracking statistics for host IPs, ports, protocols, ACLs, and servers protected by TCP intercept. subinterface command, as shown in the following example: Additional mitigation techniques are covered later in this paper. The Arbor Networks Pravail Availability Protection System (APS) solution is an example of an onsite (on premise) solution. For details, including Service Level Agreement (SLA) information, see theVerizon DoS Defense page. This communication often takes place over Internet Relay Chat (IRC), encrypted channels, bot-specific peer-to-peer networks, and even Twitter. It presented classic and current methodologies in the identification, classification, and mitigation of DDoS attacks. The purpose of this white paper is to provide a number of tools, some or all of which may apply to a customer's environment, that can be part of an overall toolkit to help identify and mitigate potential DDoS attacks on customer networks. If no specific feature keyword is provided, the command enables tracking for all statistics. TCP-FTP 236 0.0 12 66 0.0 1.8 4.8
Like Basic Threat Detection, the Advanced Threat Detection is purely informational. If any of the seven fields differs from flows that have previously been created, a new flow is created and added to the NetFlow cache. Packet captures on the ASAs interfaces facing the attacker and/or target(s) can also help clarify the nature of the attack. The attack works by opening connections on the victim's server and sending a partial request. SrcIf SrcIPaddress DstIf DstIPaddress Pr SrcP DstP Pkts
The value ranges from 0 through 100 and is set by Cisco Systems, Inc. These include the following: Administrators canand shouldexamine DNS logs and statistics as regularly as possible. A botnet is a gang of Internet-connected compromised systems that could be used to send spam email messages, participate in DDoS attacks, or perform other illegitimate tasks. A prime example of these types of attacks isSlowloris, a tool that allows an attacker to take down a victim's web server with minimal bandwidth requirements and without launching numerous connections at the same time. There are key details that establish a firewall as a firewall and not a Layer 3 forwarding device. This DNS-related information should then be correlated with other forms of telemetry (such as NetFlow, packet capture, and application logs) discussed in this section to further investigate potential malicious behavior in the network. last clearing of statistics never
It also provides a free tool to test a single DNS server to determine whether it allows open recursion. The following are several examples of the more specific types of DDoS attacks and related tools. For more details about the AT&T Internet Protect - Distributed Denial of Service Defense solution, seeAT&T Internet Protect - Distributed Denial of Service Defense Solution Product Brief(PDF). Volumetric attacks generally use botnets to amplify the attack footprint. When administrators use uRPF in loose mode, the source address must appear in the routing table. Scalable global DDoS protection. For more details, seeStateful Devices. For more details about firewall stateful inspection, see theCisco IOS Software Stateful Packet Inspectionsection of theCisco IOS Firewall Design Guide. VisitConfiguring Threat Detectionfor more information about this feature. For ACLs, Threat Detection keeps track of the top 10 ACEs (both permit and deny) that were hit the most within a specific time period. Options include WAF, threat intelligence, advanced analytics, SSL traffic inspection, cloud signaling and hybrid DDoS protection. New here? Threat Detection is only supported in single context mode. Gi0/0 192.168.12.185 Gi0/1 192.168.60.239 11 0BD7 0050 1
The components that make up an attack have not changed much either. Multiple deployment options, including cloud-based, CPE, and hybrid deployment options, offer solutions for every customer. The threat detection feature has three main components: Each of these components is described in detail in these sections. The system will notice that no application listens at that port and reply with an ICMP destination unreachable packet. Data provided through NetFlow is similar to information in a phone bill. Intrusion Prevention/Detection System Alarms. TCP-Telnet 11393421 2.8 1 48 3.1 0.0 1.4
Contents Introduction: The Case for Securing Availability and the DDoS Threat Categorization of DDoS Attacks and Problems Caused DDoS Attack General Categories Volume-Based DDoS Attacks Application DDoS Flood Attacks Low-Rate DoS Attacks Detailed Examples of DDoS Attacks and Tools Internet Control Message Protocol Floods Smurf Attacks SYN Flood Attacks UDP Flood Attacks Teardrop Attacks DNS Amplification Attacks SIP INVITE Flood Attacks Encrypted SSL DDoS Attacks Slowloris Low Orbit Ion Cannon and High Orbit Ion Canon Zero-Day DDoS Attacks The DDoS Lifecycle Reconnaissance Exploitation and Expansion Command and Control Testing Sustained Attack Network Identification Technologies User/Customer Call Anomaly Detection Cisco IOS NetFlow Packet Capture ACLs and Firewall Rules DNS Sinkholes Intrusion Prevention/Detection System Alarms ASA Threat Detection Modern Tendencies in Defending Against DDoS Attacks Challenges in Defending DDoS Attacks Stateful Devices Route Filtering Techniques Unicast Reverse Path Forwarding Geographic Dispersion (Global Resources Anycast) Tightening Connection Limits and Timeouts Reputation-Based Blocking Access Control Lists DDoS Run Books Manual Responses to DDoS Attacks Traffic Scrubbing and Diversion Conclusion References NetFlow Reputation Management Tools DDoS Run Book Case Study and Template. , created by an individual called TFreak in 1997. I am not sure if it's also usable in the more limited Flexconfig support that's in FDM. Choose the type of Profile. The time periods tracked in all of these cases are 20 minutes, 1 hour, 8 hours, and 24 hours. Feature Information for Protection Against Distributed Denial of Service Attacks The Protection Against Distributed Denial of Service Attacks feature provides protection from DoS attacks at the per-box level (for all firewall sessions) and at the VRF level. Cisco Catalyst and Meraki network management experience. Distributed Denial-of-Service (DDoS) attacks continue to become more frequent, more powerful, and more damaging. In stateful firewall solutions, there is a component commonly known as the stateful packet inspection (SPI) engine. DDoS Infrastructure Components. If the core of the Internet is impacted by a malicious attack or inadvertent outage, we will all suffer because the Internet has become our lifeblood in terms of how we work, live, play, and learn. This document presented the different attack types, their categories, and the techniques they use. For example, when an attack such as anHTTP GET/POST floodoccurs, given the information known, an organization can create an ACL to filtering known bad actors or bad IPs and domains. -------- Flows /Sec /Flow /Pkt /Sec /Flow /Flow
Cisco ASA 5525X, Cisco Cisco SG 300, Dell EqualLogic PS6210X, Brocade NI-CER-2048, and Elfiq LB2500E Load Balancers . Common stateful inspection devices and their role in threat mitigation are firewalls, IDS/IPS devices, load balancers, and web application firewalls. white paper provides more information about the, Another type of ICMP-based attack is a smurf attack. I remember in ASA we could set up embryonic connection limits to offer basic protection. SrcIf SrcIPaddress DstIf DstIPaddress Pr SrcP DstP Pkts
While there are various ways to accomplish DDoS protection and attack mitigation, most providers offer an inline solution in which an organization's traffic can be sent to or through the service entity. *0050
In today's digital economy, your online business must be available 24x7x365 to customers, partners, and employees. Reputation technology has two aspects. This can include ACLs and QoS on upstream devices. If this is the case, simply lower the configured rates for the threat you want to see. Using the DDoS service from your ISP? Because networks vary, we do not aim to provide an all-inclusive DDoS mitigation document that applies to every organization, but we have attempted to describe the tools available for dealing with DDoS attacks. Design & Configure Configuration General (15) Cisco ASA: Same security level interface Technology: Network Security Area: Firewalls Vendor: Cisco Software: 8.X, 9.X Platform: Cisco ASA Sometimes you cannot decide which interface should be higher or lower and you give two or more interfaces the same Security level. Firewall configuration and management, Cisco ASA and/or FirePower NGFW preferred; SD-WAN technologies including Meraki. For more details on this solution, see, router#show ip cache flow
Cisco Secure DDoS Protection defends organizations and ensures network availability using behavior-based and machine-learning algorithms to rapidly detect and mitigate sophisticated DDoS attacks targeting both the network- (L3/4) and application-layer (L7). Subsequently the "clean" traffic will be routed back into the customer environment. Gi0/0 10.88.226.1 Gi0/1 192.168.202.22 11 007B 007B 1
Some tools can also display the top ports or protocols used in the captures, which could help identify potential DoS activity. It's free to sign up and bid on jobs. Complete these steps in order to trigger these threats simultaneously: Note: T5 configures nmap to run the scan as fast as possible. For testing and troubleshooting purposes, it can be helpful to manually trigger various threats. While the time periods themselves are not configurable, the number of periods that are tracked per object can be adjusted with the 'number-of-rate' keyword. Note:Switches support port and VLAN ACLs. Cisco ISE 1.3 Advanced Features Training - Firewall Installation, Configuration, and Management: Essentials 1 PAN-EDU-201 Firewall Installation, Configuration, and Management: Essentials 2. %ASA-4-733101 should list either the target host/subnet or the attacker IP address. The configured event action would result in preventive or deterrent controls to help protect against an attack that was attempting to carry out the attacks. Note: Connections that are reset by the target server are not counted as part of the threat. Figure 10. If the detected attack is a false positive, adjust the rates for a TCP intercept attack to a more appropriate value with the threat-detection statistics tcp-intercept command. In addition, many DNS implementations allow recursion by default, even when the name server is anticipated to serve only authoritative requests. A Domain Name System (DNS) request can be recursive or nonrecursive (or iterative). Comprehensive DDoS protection enables predictable engineering for network and application resources by eliminating anomalous flows that consume network resources and impact application availability. For more details about IDS/IPS stateful inspection, see Cisco IOS Intrusion Prevention System. This means that the statistics generated by basic threat detection only apply to the entire appliance and are generally not granular enough to provide information on the source or specific nature of the threat. This section contains tips for triggering a few common threat types. uRPF works in two different modes: strict mode and loose mode. provides more information about how TCP SYN flood attacks work and common mitigations. Network black holes are places where traffic is forwarded and dropped. Cisco provides the official information contained on the Cisco Security portal in English only. Care must be taken to ensure that the appropriate uRPF mode (loose or strict) is configured during the deployment of this feature because it can drop legitimate traffic. Statistics for TCP intercept are similar to Basic Threat Detection in the sense that the user can configure the measured rate-interval along with specific average (ARI) and burst (BRI) rates. Basic threat detection is enabled by default on all ASAs running 8.0(2) and later. How Cisco IT Uses NetFlow to Capture Network Behavior, Security, and Capacity Data //www.cisco.com/web/about/ciscoitatwork/network_systems/network_data_monitoring_and_reporting_web.html Cisco IOS NetFlow http://www.cisco.com/c/en/us/products/ios-nx-os-software/ios-netflow/index.html NetFlow collectors help with collection, analysis, and display of NetFlow data exported from network devices: http://searchengineland.com/5-free-deep-reputation-management-checking-tools-163551 https://www.openforum.com/articles/online-reputation-management-tools/ http://socialmouths.com/blog/2013/04/25/manage-your-online-reputation/, https://www.sans.org/reading-room/whitepapers/incident/practical-social-media-incident-runbook-34252(PDF) https://www.whitehatsec.com/blog/checklist-to-prepare-yourself-in-advance-of-a-ddos-attack/. The following steps are illustrated in Figure 8: Note:DNS Best Practices, Network Protections, and Attack Identificationprovides information about general best practices, network protections, and attack identification techniques that operators and administrators can use for DNS implementations: Additional modern DDoS mitigation techniques are covered later in this paper. Advanced and Scanning ThreatDetection are much more resource intensive because they have to keep track of various statisticsin memory. Basic threat detection statistics are enabled by default and have no performance impact. The key is to collect traffic information (NetFlow) and calculate various statistics to compare against a baseline. If this calculated value exceeds 800 drops per second, a threat is logged. No matter what, the 20 minute rate is always displayed. Normally, the security appliance examines only the destination address when determining where to forward the packet. This effort often causes the stateful device to be the "choke point" or succumb to the attack. There is no one-size-fits-all approach. In a SYN flood attack, the attacker does not reply to the server with the expected ACK. See the Configuration section for more information. Configure, install, maintain and manage firewall security appliances (Cisco ASA, PAN, Fortinet) Provides support for anti-DDOS mitigation systems, threat sandboxing and other anti-threat technologies; Function as a technical leader with strategic vision and maintain multiple projects at once. Each threat category can have a maximum of 3 different rates defined (with rate IDs of rate 1, rate 2, and rate 3). This concept is illustrated in Figure 3. ACLs provide a flexible option to a variety of security threats and exploits, including DDoS. The attacker determines when to instruct the botnet clients to begin sending traffic to the targeted infrastructure. Basic Threat Detection has very little performance impact on the ASA. This ensures that intermediate devices do not need to waste resources processing illegitimate traffic. Scanning Threat Detection is disabled by default. Modern operating systems are now immune to this attack, but because of a deficiency in the TCP fragmentation and reassembly implementation of older operating systems, this attack caused a crash of those systems. Slowloris is an attack tool created by RSnake (Robert Hansen) that tries to keep numerous connections open on a web server. 05:29 AM. Encrypted (SSL-based) DDoS attacks are becoming more prevalent because they allow attackers to gain the following advantages: Note:Modern mitigation capabilities for SSL DDoS attacks are covered later in this paper. Manual responses also include obscuring IP addressing schemes, using Network Address Translation (NAT), and creating custom IPS signatures or application layer inspection policies based on attack traffic, baselines, and industry events. Many such commodity services provide only a best-effort SLA against an attack. 02-21-2020 TCP intercept could also beconfigured to protect the targeted server(s), but this could simply result in a Conn Limit threat being logged instead. Gi0/0 192.168.10.17 Gi0/1 192.168.60.97 11 0B89 0050 1
Geographic Dispersion (Global Resources Anycast). It is not supported on the ASA 1000V platform. IDS/IPS devices are often deployed at the network core and/or edge and provide intelligent decision capabilities by using DPI to analyze and mitigate an array of attacks and threats. Attackers are using evasion techniques outside of the typical volume-based attacks to avoid detection and mitigation, including "low and slow" attack techniques and SSL-based attacks. After the potential victims are identified, they are targeted for exploitation so that the attacker can control the targeted system. Web Interface and CLI Access User Roles User Passwords Internal and External Users Managed devices support two types of users: Internal userThe device checks a local. This is illustrated in Figure 7. Remotely triggered black hole (RTBH) filtering can drop undesirable traffic before it enters a protected network. For additional information about general best practices, network protections, and attack identification techniques that operators and administrators can use for implementations of the DNS protocol, seeDNS Best Practices, Network Protections, and Attack Identification. Threat detection statistics can help administrators manage threats to the Cisco ASA; for example, enabling scanning threat detection provides statistics to help analyze the threat. topics like intrusion detection, DDoS attacks, buffer overflows, and malware creation in detail, . As a last resort, the traffic can also be blocked manually on the ASA via an ACL or TCP intercept policy. This is also referred to as DPI (deep packet inspection). A profusion of application types use name-based lookups using DNS. These attackers and their campaigns are becoming sophisticated. Each entity must determine which solutions meet its requirements and which help mitigate the threats that concern it. A UDP flood attack is triggered by sending a large number of UDP packets to random ports on the victim's system. %ASA-4-733104 and %ASA-4-733105 lists the host targeted by the attack that is currently being protected by TCP intercept. With full PoE+ capability, power and fan redundancy, stacking bandwidth up to 160 Gbps, modular uplinks, Layer 3 feature support, and cold .
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