Re: cost of frame relay snooping

[Ted Doty <ted () iss net>]

At 05:13 PM 10/30/97 +0200, Jyri Kaljundi wrote:

> Still I have been thinking about what it takes to break frame relay
> security. Has anyone done any cost assessments about how much it takes to
> snoop on frame relay lines? Sorry I know nothing about actual frame relay
> equipment, what is needed to listen and record FR traffic (on telecom
> fiber lines between cities, or at the last step where the line is
> connected to the customer premises).

Look at the following issues of Phrack (listed in no particular order):
"SS7 Diverter plans" 1997. I50 F9 
"DTMF signalling and decoding" I50 F13
"Introdcution to Telephony and PBX Systems" 1996. I49 F5 
"The Fine Art of Telephony" 1992. I40 F7
"Packet Switched Network Security" 1992. I42 F4 
"How to Build a DMS-10 Switch" 1992 I41 F7 
"Phone Bugging: Telecom's Underground Industry" 1989.Issue 26 File 7
"Tapping Telephone Lines" 1987 Issue 16 File 6
"Understanding The Digital Multiplexing Systems (DMS)" 1987. I12 F4 
"Understanding DMS Part II" 1987. I14 F5 
"Digital Multiplexing Systems (Part 2)" 1988. I19 F3 
"DMS-100" 1986. I5 F5 
"Eavesdropping" 1986. Issue 3 File 7 
"AT&T Definity System 75/85" 1994. Issue 46 File 25 
"Blocking of Long Distance Calls" 1988. I21 F8
"Blocking of Long Distance Calls... Revisited" 1989. I29 F9 
"Circuit Switched Digital Capability" 1987. I10 F5 
"Computer-Based Systems for Bell System Operation" 1989. I20 F2
"DTMF signalling and decoding" 1997. I50 F13 
"Acronyms" 1993. I43 F21-25 
"Guide to 5ESS" 1993. I43 F16
"Introdcution to Telephony and PBX Systems" 1996. I49 F5 
"Wide Area Networks Part 1" 1986. I5 F7
"Wide Area Networks Part 2" 1986. I6 F8

Note that this isn't a comment on the quality of the information in the
files, jsut that they're widely available
(http://world.std.com/~loki/security/phrack/index.html)

- Ted

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Ted Doty, Internet Security Systems | Phone: +1 770 395 0150
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