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SecAst (Asterisk Intrusion Detection and Prevention)
OverviewSecAst (Security For Asterisk) is an intrusion detection and prevention system designed specifically to protect Asterisk based phone systems against attack and fraud. SecAst uses a variety of techniques to detect intrusion attempts, halt ongoing attacks, and prevent future attacks. In addition, SecAst uses advanced techniques to detect valid credentials that have been disclosed / compromised and are being abused. SecAst also uses heuristic algorithms to detect fraudulent activity based on known attack patterns. Upon detection SecAst blocks the current attacker from the Asterisk host at the network level. SecAst can also allow/deny any user based on the greographic source (country / region / city) of their IP address.
SecAst is a 100% software solution, communicating with Asterisk primarily through the Asterisk Management Interface (AMI), but also monitoring Asterisk message/security logs for relevant information, and also communicating with the Linux network interfaces. The data from these sources allows SecAst to monitor connection and dial attempts with invalid credentials, the rate at which users/peers are dialing, the number of channels in use by user/peer across all protocols, the source IP of remote users/peers, etc. By combining this data SecAst can effectively stop attacks/fraud in its tracks, and alert the administrator with details of each attack.
SecAst offers detailed geographic allow/deny rules (geofencing) down to the city level without large or complex firewall rules (all geofencing rules remain within SecAst). Use of geofencing dramatically reduces the number of, and risk from, attacks, allowing administrators to quickly eliminate continents/countries/regions/cities where their users would never be located.
SecAst offers extensive interfaces to interact with other programs, utilities, external firewalls, billing systems, etc. allowing for considerable customization. For example, changes in Threat Level can trigger scripts which alert administrators, shutdown interfaces, change firewall rules, etc.
SecAst is available in both free and commercial editions. You can get SecAst, as well as more documentation, at www.telium.ca.
Asterisk CompatibilitySecAst is compatible with a broad range of Asterisk versions and distributions. SecAst works with Asterisk versions 1.4 through 12, both 32-bit and 64-bit. SecAst is also compatible with a wide range of Asterisk distributions, from Digium's plain old Asterisk, to FreePBX and PBX In A Flash and TrixBox, to 3rd Lane and more. SecAst is also the only product to work across multiple protocols/modules including PJSIP,SIP,IAX,IAX2,MGCP (and more).
Brute Force Attack DetectionSecAst can detect brute force attacks (attempts to gain access by trying various combinations of usernames/passwords, commonly used extensions, commonly used passwords, etc). Unlike other products, SecAst can detect these attacks even if spread across many days (attackers are now performing "thin" attacks to bypass simplistic detection programs like fail2ban). SecAst can respond to these attacks by blocking them at the network level, preventing any further attempts. These blocks can last for hours, days, or indefinitely.
Breached Credential Use DetectionSecAst can detect unusual traffic and usage patterns indicative of credentials that have been breached (leaked or somehow discovered by an attacker). This includes monitoring the number of calls in progress, how quickly the calls are setup, even the rate at which the user is dialing digits. SecAst can respond to these attacks by blocking them at the network level, preventing any further attempts. These blocks can last for hours, days, or indefinitely.
Heuristic Attack DetectionSecAst can learn new attack patterns and adjust its detection accordingly. The heuristic scanner monitors a variety of Asterisk and network traffic patterns to detect suspicious activity, correlate them with rules which indicate likely attacker activity, and then block the attacker at the network level, preventing any further attempts. These blocks can last for hours, days, or indefinitely.
Geographic Allow / DenySecAst incorporates a database of IPv4 and IPv6 address across the world, including the continent / country / region / city of each IP. SecAst can be configured to allow or deny access to any combination of these geographic attributes (as well as a default allow / deny behavior). If an attacker or user attempts to use the Asterisk server from a denied location, the user is immediately disconnected. This creates a geographic fence (or geofence) which keeps good guys in and bay guys out.
Dial Pattern RecognitionSecAst monitors all digits being dialed and can block attempts to call restricted numbers. Although dialplans also perform this function, if an Asterisk server is compromised (eg: FreePBX GUI hacked) then SecAst will override the dialplan and still block or accept only certain numbers. Dial pattern recognition can match any dial string and either allow or block the dial attempt based on administrator defined rules.
Trunk and Endpoint TrustSecAst can be instructed to trust particular trunks, endpoints (users or phones), and IP addresses so that they are exempt from security screening. This allows administrators to grant particular users access regardless of location, call volumes, etc. (which may be necessary for traveling sales staff, etc). This also allows administrators to designate certain trunks / routes as trusted and others as untrusted.
Threat Level ManagementSecAst monitors the number and rate of attacks against the Asterisk server, and based on administrator defined thresholds will set the threat level of the system. Changes in threat levels can trigger custom scripts, notifications, and other system based features.
Telnet InterfaceAdministrators will be immediately comfortable with the simple and powerful telnet interface to SecAst. The security system can be managed and controlled from a telnet interface, whether from a PC, a tablet, or a cell phone. The interface includes online help, and user friendly rich terminal output.
Browser InterfaceSeasoned administrators and novices alike will be comfortable with the simple and powerful browser (web) interface to SecAst. The security system can be managed and controlled from any browser, including a PC, a tablet, or a cell phone. The interface includes blocking / unblocking IP's, checking threat levels, viewing attack history, etc.
Socket & REST InterfacesDevelopers will appreciate the socket and REST (Representational State Transfer) interfaces to SecAst, as the power and control of SecAst can be easily expanded and integrated with other system administration and monitoring tools. SecAst includes sample PHP code to show how to extract data and control SecAst via a web service and via the socket interface.
ScreenshotsWeb Interface - Top attack sources by country
Web Interface - Map of attack sources
E-Mail Interface - Attack alert
Telnet Interface - Control by telnet
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