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accessing a floppy or downloading email attachments) A good list of vendors can be found in the Microsoft Knowledge Base article Q49500 at http://supportmicrosoftcom/ support/kb/articles/Q49/5/00ASP An inexpensive tool called The Cleaner, distributed by MooSoft Development, can identify and eradicate over 1,000 different types of backdoor programs and Trojans (or so their marketing literature suggests) See http://wwwmoosoftcom/cleanerhtml When selecting a product, make sure that it looks for critical features such as binary signatures or Registry entries that are not typically altered by slow-witted attackers, and remember that these tools are only effective if their databases are kept up-to-date with the latest signatures! Keeping an Inventory Assuming that compromise has already occurred, vigilance is the only recourse against almost all of the back doors discussed earlier A savvy administrator should be able to account for every aspect of system state and know where to quickly locate a trustworthy and reliable source for restoration We highly recommend inventorying critical systems at initial installation and after every upgrade and program installation Tracking system state like this can be extremely tiresome in a dynamic environment, and especially on personal workstations, but for relatively static production servers, it can provide a useful tool for verifying the integrity of a potentially compromised host An easy way to accomplish this is to employ system-imaging tools, which we discuss later in this chapter The rest of this section will outline some free (many are built in to most systems), manual methods for keeping track of what s going on in your environment By following the upcoming simple tips before an attack occurs you ll have a head start when it comes to figuring out what happened Coincidentally, many of these techniques perform just as well as a forensic exercise after a compromise Who s Listening on Those Ports It may seem obvious, but never underestimate the power of netstat to identify rogue port listeners like those discussed in this chapter The following example illustrates the utility of this tool (edited for brevity):.

Listing 6 2. A Commonly Made Fatal Mistake When Subclassing CCSprite (or Other Classes for That Matter) -(id) init { if ((self = [super initWithFile:@"ship.png"])) { [self scheduleUpdate]; } return self; }

D:\Toolbox>netstat -an Active Connections Proto TCP TCP TCP UDP Local Address 0000:135 0000:54320 19216823436:139 0000:31337 Foreign Address 0000:0 0000:0 0000:0 *:* State LISTENING LISTENING LISTENING

Powder-Actuated Tools 315 Ladders 315 Screwdrivers and Chisels 317 Fire Prevention 317 Co-worker Safety 317 16: First Aid 319 Open Wounds 320 Bleeding 320 Severe Bleeding 321 Tourniquets 321 Infection 322 Splinters 322 Eye Injuries 324 Scalp Injuries 325 Facial Injuries 325 Nosebleeds 326 Back Injuries 326 Legs and Feet 326 Blisters 326 Hand Injuries 327 Shock 327 Burns 329 Treatment 329 Heat-Related Problems 330 Cramps 330 Exhaustion 331 Glossary 333 Appendix 345 Index359

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No, it s not about scheduleUpdate, that s just to throw you off guard. The problem lies in the fact that the (id) init method is the default initializer, which is eventually called by any other specialized initializer like initWithFile. Can you imagine now what s wrong with the code Well, initWithFile will eventually call the default initializer, (id) init. Then, since this class s implementation overrides it, it will call [super initWithFile: ..] again. Repeat ad infinitum. The solution is very simple. As shown in Listing 6 3, it is sufficient to give the initializer method a different name something other than (id) init.

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Of course, the only weakness to netstat is that it doesn t tell you what is really listening on any of these ports fPort from Foundstone, Inc (in which the authors are principals) performs this task nicely on Windows NT and 2000:

Listing 6 3. Fixing the Infinite Loop Caused by the Code in Listing 6 2 -(id) initWithShipImage { if ((self = [super initWithFile:@"ship.png"])) { [self scheduleUpdate]; } return self; }

D:\Toolbox>fport fPort - Process port mapper Copyright(c) 2000, Foundstone, Inc http://wwwfoundstonecom PID NAME TYPE PORT --------------------------------------222 IEXPLORE UDP 1033 224 OUTLOOK UDP 1107 224 OUTLOOK UDP 1108 224 OUTLOOK TCP 1105 224 OUTLOOK UDP 1106 224 OUTLOOK UDP 0 245 MAPISP32 UDP 0 266 nc TCP 2222

avid and Gary Tuck are a father and son team who have devoted their lives to the electrical trade Both men are master electricians and operate a family-owned business in Fort Fairfield, Maine Over the years, the Tuck team has done residential, light commercial, commercial, and industrial work Their services have been in such high demand that they have traveled hundreds of miles to take on large projects They are known for responding to the most basic requests from area homeowners Having been in business for decades, the Tuck name is known to nearly everyone in their community Their well rounded and deep rooted experience brings this book to life with years and years of hard earned, hands on knowledge

CAUTION: In general you should never call anything but [super init] in the default initializer -(id) init to avoid this problem. If you have to call [super initWith...] in your class s initializer method, then you should name the initializer method accordingly, as -(id) initWith... (e.g., like (id) initWithShipImage as in Listing 6 3).

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