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Depending on how you were notified of the incident, you may have some idea of how the administrative access was gained For example, an IDS may show a telnet connection to the router from an Internet IP address In other cases, you will need to find the answers during the investigation With the information you ve already collected, namely the configuration file and the list of listening ports, the investigation is off to a strong start Listening Services The listening services on the router provide the potential attack points from the network The list of interfaces should tell you if the router has modem access A review of the physical security of the router will determine the relative accessibility of the console port Most likely, only a couple of avenues of attack are possible, and this simple exercise has narrowed down the scope Passwords Most avenues of attack to the router require a password (There are a few exceptions, which we will cover in the next section) Routers can have different passwords for different services, such as telnet, SNMP, and enable access Attackers can learn the passwords to the router through a variety of different means The most obvious is through brute force password guessing This technique, popularized by Matthew Broderick in War Games (password Joshua), is still very much in use today, though usually in automated fashion Most brute force password guessing attacks are picked up by the IDS, which is helpful during investigations If the passwords in use are extremely difficult to guess (alphanumeric, more than eight characters, and so on), then brute force password guessing probably was not the means of compromise The passwords are stored in the configuration file, either as cleartext or encrypted using the Vigenere cipher (XOR) or MD5 algorithm Another way for attackers to learn the password is through network sniffing Any protocol that passes cleartext data and authentication information such as SNMP, telnet, HTTP, and TFTP is vulnerable to network sniffing A quick review of the passwords in use will provide the investigator with some clues about the compromise Other Compromise Possibilities If the compromise did not come via a listening service or a password, there are a few other possibilities Anyone with console access to the router can gain administrative access to the box through a reboot and appropriate procedures The system uptime information gained during the investigative steps will provide the last time the router was rebooted Alternatively, if a modem is connected to the router, it s possible that the last legitimate user did not log off properly, allowing an attacker to gain.

NOTE: Not reviewing the Target checkboxes can lead to all kinds of issues, from compile errors to file not found errors or crashes during gameplay when files haven t been added to the targets that need them. Or you might simply waste space by adding files to targets that don t need them at all, for example by adding iPad and iPhone 4 high-res images to regular iPhone/iPod Touch targets.

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access to the router without a password Another method of compromise, TFTP, deserves a bit of explanation Routers use TFTP to store and reload configuration files over a network TFTP is a UDP protocol, inherently insecure It requires no authentication, and all data passes as cleartext Router configuration files often use the naming convention of <hostname>-confg or <hostname>cfg To take advantage of these factors, an attacker only needs to scan a network for a router and a TFTP server The attacker learns the hostname of the router via Domain Name System (DNS) resolution and requests the configuration file from the TFTP server At this point, the attacker can use the password information in the configuration file to access the router or modify the configuration file, and then upload to the TFTP server and wait for a network reload Cisco IOS version 120 and later supports other methods, such as FTP, for storing and reloading configuration files

Figure 4 5. Naming the new scene and making sure it s added to the appropriate target(s)

GO GET IT ON THE WEB Password recovery procedures for Cisco products: http://wwwciscocom/warp/ public/474/indexshtml

At this point, our GameScene class is empty and the first thing we need to do to set it up as a scene is to add the +(id) scene method to it. The code we ll plug in is essentially the same as in 3, with only the layer s class name changed. What you ll almost always need in any class are the (id) init and (void) dealloc methods, so it makes sense to add them right away. I m also a very cautious programmer and decided to add the logging statements introduced in 3. The resulting GameScene.h is shown in Listing 4 1 and GameScene.m is in Listing 4 2.

PF = 08 Step 3 Perform the mathematical computation PF = 08 NOTE An important fact to remember with power factors is that the ratio is never greater than 1 For estimating purposes, the power factor in any circuit can be assumed to be as follows: Incandescent light circuit Lighting and motors Motors only 095 to 10 PF 085 PF 080 PF

After a direct-compromise incident, all recovery steps should be taken while the router is offline The recovery should be commensurate with the attack, but as always, a paranoid stance is preferred When in doubt, take the extra steps for security Examples of steps that should be taken include the following: M I I I I I L Remove all unnecessary services Allow remote access only through encrypted protocols Allow no SNMP access or read-only access Do not use the SNMP password as the password for any other access Change all passwords Implement ACLs so that only connections from trusted hosts are allowed to the router Upgrade the software with the latest updates

Listing 4 1. GameScene.h with the Scene Method #import <Foundation/Foundation.h> #import "cocos2d.h" @interface GameScene : CCLayer { } +(id) scene; @end Listing 4 2. GameScene.m with the Scene Method and Standard Methods added, Including Logging #import "GameScene.h" @implementation GameScene +(id) scene { CCScene *scene = [CCScene node]; CCLayer* layer = [GameScene node]; [scene addChild:layer]; return scene; } -(id) init { if ((self = [super init])) { CCLOG(@"%@: %@", NSStringFromSelector(_cmd), self); } return self; } -(void) dealloc { CCLOG(@"%@: %@", NSStringFromSelector(_cmd), self); // never forget to call [super dealloc] [super dealloc]; } @end

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