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lug-bg: Fwd: [net] com and net zone wildcard records


  • Subject: lug-bg: Fwd: [net] com and net zone wildcard records
  • From: Борис Йорданов <borj@xxxxxxxxx>
  • Date: Tue, 16 Sep 2003 15:54:42 +0300

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За Боян Кроснов - надявам се нямаш против, че го поствам тук. Смятам, че ще представлява интерес за групата.
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  • Subject: [net] com and net zone wildcard records
  • From: "Boyan Krosnov" <bkrosnov@xxxxxxxx>
  • Date: Tue, 16 Sep 2003 15:07:47 +0300
  • Delivered-to: borj@xxxxxxxxxxxxxxxxx
  • Delivered-to: GMX delivery to borj@xxxxxxxxx
  • Delivered-to: mailing list net@xxxxxxxxxxx
  • Mailing-list: contact net-help@xxxxxxxxxxx; run by ezmlm
  • Thread-topic: com and net zone wildcard records
Ot dnes sutrinta Verisign vryshtat A zapis za vsqko ime v neregistriran
domain v .com i .net tld zonite.

primer:
boyan@marla:~/web/stuff$ dig www.boyan-krosnov.com @a.gtld-servers.net

; <<>> DiG 9.2.1 <<>> www.boyan-krosnov.com @a.gtld-servers.net
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56575
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 13

;; QUESTION SECTION:
;www.boyan-krosnov.com.         IN      A

;; ANSWER SECTION:
www.boyan-krosnov.com.  900     IN      A       64.94.110.11
------------------------- i t.n.

Tova e ujasna ideq i schupva nqkolko fundamentalno vajni neshta. Pyrvite
za koito se seshtam:

1. domain s dva MX recorda. MX record-a s po-golqm prioritet e s
sbyrkano ime primerno 
ludost.net. 	MX	10 mx1.ladost.net
ludost.net.	MX	20 mx2.ludost.net

Do sega tazi shema e rabotila vypreki pravopisnata greshka v
konfiguraciqta. Sega vichkata poshta za ludost net shte hodi na
mx1.ladost.net -> 64.91.110.11 i shte se dropi tam

2. Do sega v SMTP protokola kogato nqkoj se opita da se predstavi s
HELO, s ime koeto ne syshtestvuva, konekciqta se prekysva. Sega vsqko
ime v .com i .net syshtestvuva. Syshto imeto na domain ili host ot
envelope from adresa (RCPT TO: komandata) e zadyljitelno da syshtestvuva
. Sega vseki izmislen host v .com i .net syshtestvuva.

3. WPAC (web proxy auto-configuration). Predstavete si windows 2000 pc s
konfiguriran domain ahglhdskjg.com i ime alabala.ahglhdskjg.com. S
nastrojkite po podrazbirane pc-to shte pita za A zapis za
wpac.ahglhdskjg.com. posle shte se opita da se vyrje na tazi mashina  i
da iztegli fail za avtomatichna nastojka na proxy-to.
E, sega veche e vyzmojno Verisign (ili kojto hackne web servera im) da
vi nastroi kakvoto proxy na nego mu e udobno na vsichki mashini s
defaultni nastrojki i nesyshtestvuvash domain.

4. Security probiv v tozi web server 64.91.110.11 avtomatichno dava na
napadatelq vyzmojnost da pronikni v milioni sistemi po celiq svqt
(windows-i s nepatchnati internet exploreri). Da vi e chestit doom-a na
internet-a.

5. Nishto konkretno ne pravqt v momenta s vsichki drugi paketi i
konekcii koito sluchajno popadat tam ( za sega obrabotvat samo HTTP i
SMTP) , no nishto ne gi spira da zapochnat da obrabotvat primerno pop3 i
da kradat paroli na potrebiteli, koito si vyvejdat imeto mail syrvyra
greshno. Tova e edin ogromen probiv v privacy-to ne vsichki ni.

6. Web server i SMTP software kojto se tyrkalq na tozi adres ne e
bezbygav. Vidqh veche cross-site scripting prez http syrvyra tam, a smtp
syrvyra e v totalno narushenie na edna kamara rfc-ta.

------------------------------------------------------
Vyprosa e kakvo da pravim i tozi pyt nqma da vi kazvam kakvo mislq az da
pravq za da ne naklonq diskusiqta v edna ili druga posoka.

BR,
Boyan Krosnov, CCIE#8701 and more
just another techie speaking for himself


--- End Message ---


 

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