Penetration Testing mailing list archives
RE: Cracking WEP and WPA keys
From: <cerealkilla () cox net>
Date: Tue, 13 Dec 2005 17:16:17 -0500
To add my 2 cents, I've seen it stated that if you use a 63 character complex pass phrase with WPA PSK that while theoretically possible, at this time it will not be broken. Also some have mentioned that newer equipment has fixed the problem with weak IV's? Does anyone know what specially has been changed? Are these particular implementations still vulnerable? Are there any tested exploits that may be used against these newer versions? Has anyone tried cracking WEP with a Cisco 1200AP? -----Original Message----- From: Seth Fogie [mailto:seth () fogieonline com] Sent: Tuesday, December 13, 2005 1:02 PM To: pen-test () securityfocus com Subject: Re: Cracking WEP and WPA keys I teach a wireless hacking class and perform this wep cracking live in under 4 minutes with generated data. The airoreplay method has taken between 6 and 20 minutes, depending on luck and traffic generated. However, this is in a controlled environment. One, you have to be sure your airocrack is using the same frequency as your wireless network. Two, you have to be sure your using the same standard (b vs g). If your airodump is capturing only b traffic, and your network is primariy g, you will only see beacons...which are worthless when cracking wep.. In addition, some vendors have taken steps to prevent these types of attacks. I personally use a Linksys 54g router with a Netgear G card set to 802.11b only during the tests...my senao card also works. However, other cards and AP's I have used aren't as crack friendly. WPA is a different story all together. I can crack WPA in less than a second assuming my dictionary file is only one word long and that word is my passphrase. All you need to do is capture 4 packets and then use cowpatty to test the dictionary words to see which one matches. Depending on the passphrase setup in WPA, and its position in the dictionary, your crack could be seconds or years...and if the passphrase is not in your dictionary file...well, then it won't be cracked. Seth Fogie Airscanner Moderator for wifisec () securityfocus com Shenk, Jerry A wrote:
Cracking WEP depends on a ton of stuff. If you're cracking it looking for weak IVs, you'll need an AP that has weak IVs. Most of the new ones avoid them to one degree or another. What AP are you using? I used a Linksys in my initial testing (a couple years ago) and cracked the key in 4 hours. I also tried to crack a Cisco 350 (replaced by the 1200 series) and never was able to crack the key using that method, even after running for days. Another thing, that "crack in seconds" is based on already having hours or days worth of traffic to use. There are some new tools that generate traffic rather than having to wait for it and some of the new cracking methods are better or worse, depending on your perspective. I think some of these "WEP is worthless" stories are overly sensational. Yes, WEP is broken, ok, possibly even horribly broken but it stops a 'casual connector', it even stops quite a few determined hackers (it stopped you;). If you're the NSA...ok, WEP is worthless....the people attacking you are determined, well financed professionals. If you're my mom, checking her e-mail from home with a wireless laptop, I think WEP is perfectly fine. Installing everything needed for a good PEAP implementation for my mom is absolutely insane. Most people are gonna be someplace in the middle where a little bit of risk evaluation is in order. -----Original Message----- From: Robin Wood [mailto:dninja () gmail com] Sent: Tuesday, December 13, 2005 5:09 AM To: pen-test () securityfocus com Subject: Cracking WEP and WPA keys Hi I've just been on a wireless security course where there was a lot of talk about WEP keys being poor security and easily crackable. I got home and decided to put it to practice and use aircrack against my own WEP key. Using airodump and aireplay I collected 1 million IVs and set aircrack off attacking it. After around 4 hours I got bored of waiting and on another machine tried playing with aircracks debug option where you can pass sections of the key you already know. I found if I passed the whole key except the last digit it could be cracked with a fudge factor of 2, if I removed the last 2 digits then I had to up the fudge factor to 5 and up it to 8 if I removed the last 3 digits. With anything less than the fudge factor mentioned I was told that it couldn't crack the key. All the examples I've seen seem to suggest that cracking should take minutes not hours and all keys should be crackable. What experiences do other testers have? Have I done something wrong? I abandoned the full attack after 5 hours as it was running with the default fudge factor of 2 so would probably not have managed to crack the key. I've also seen a video on the Remote Exploit site showing a WPA key cracked in 10 minutes using cowpatty and a dictionary attack. How realistic is this? Robin ------------------------------------------------------------------------ ------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 ------------------------------------------------------------------------ ------- **DISCLAIMER This e-mail message and any files transmitted with it are intended for the
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vulnerabilities
to SQL injection, Cross site scripting and other web attacks before hackers
do!
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----
---------------------------------------------------------------------------- -- Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 ---------------------------------------------------------------------------- ---
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Current thread:
- Re: Cracking WEP and WPA keys, (continued)
- Re: Cracking WEP and WPA keys Robin Wood (Dec 14)
- Re: Cracking WEP and WPA keys Robin Wood (Dec 14)
- Re: Cracking WEP and WPA keys Dave Bush (Dec 13)
- Re: Cracking WEP and WPA keys Joachim Schipper (Dec 13)
- Re: Cracking WEP and WPA keys Robin Wood (Dec 13)
- Re: Cracking WEP and WPA keys Michael Sierchio (Dec 13)
- Re: Cracking WEP and WPA keys marko ruotsalainen (Dec 14)
- RE: Cracking WEP and WPA keys Shenk, Jerry A (Dec 13)
- Re: Cracking WEP and WPA keys Alvin Oga (Dec 13)
- Re: Cracking WEP and WPA keys Seth Fogie (Dec 13)
- RE: Cracking WEP and WPA keys cerealkilla (Dec 15)
- RE: Cracking WEP and WPA keys Sahir Hidayatullah (Dec 16)
- RE: Cracking WEP and WPA keys Josh Perrymon (Dec 13)
- Re: Cracking WEP and WPA keys pagvac (Dec 14)
- Radio Signal Pent test (RFID) Louie (Dec 14)
- Re: Radio Signal Pent test (RFID) Toufeeq Hussain (Dec 27)
- Re: Cracking WEP and WPA keys David M. Zendzian (Dec 14)
- Re: Cracking WEP and WPA keys Demetrio CarriĆ³n (Dec 16)
- RE: Cracking WEP and WPA keys Rui Pereira (WCG) (Dec 16)
- Re: Cracking WEP and WPA keys Cedric Blancher (Dec 16)
- Re: Cracking WEP and WPA keys Matthias.Vallentin (Dec 16)
- Radio Signal Pent test (RFID) Louie (Dec 14)
(Thread continues...)