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RE: Threat Modelling
From: "Brewis, Mark" <mark.brewis () eds com>
Date: Fri, 21 May 2004 09:58:22 +0100

-----Original Message-----
From: Mark Curphey [mailto:mark () curphey com]

CRAMM is a general / generic Risk Assessment tool for 
information securtity.

For those who don't know, CRAMM is a high-level tool designed to model risk at the physical, policy and procedural 
level, rather than the technical. Early versions were difficult to use, and even harder to interpret.  The ISO 17799 
aligned version is far more powerful, although it needs someone skilled to drive it.

A more technical, network-level risk assessment/threat modelling tool back in the late 1990's was the L3 Network 
Security Expert/Retriever, a (for the time) sophisticated network mapping and risk analysis system . It was bought by 
Symantec about 2000 and fairly promptly disappeared.  If I remember correctly, you were able to define any type of 
custom threats and countermeasures, and model them with a reasonable level of granularity.  I only ever used it to 
model systems, rather than applications, but it was a really interesting hybrid tool.

Both tools use/used some variation of the standard:    

*       Define Assets
*       Define Vulnerabilities
*       Define Threats
*       Define Mitigation Strategies


*       Technical
*       Management
*       Operational

Risk-Remediation areas.

Neither of these addresses your requirements (particularly L3, since it appears to have gone), although I think the L3 
tool(s) came closest.  There isn't anything I know of that even comes close to doing some of this, never mind 
everything.  Most of the case and sequence diagrams I've seen have been manually defined and Visio drawn 
(paradoxically, probably the main utility that helped kill off L3 Expert/Retriever).  Risk modelling has been 
extrapolated from those, in a generally ad hoc fashion.

In many respects, I think you've answered your own question - there is a gap in this area.  If Symantec still have the 
L3 code base lying around (and it didn't metamorphose into the Vulnerability Assessment product) it might be worth 
dusting down.


Mark Brewis

Security Consultant
UK Information Assurance Group
Wavendon Tower
Milton Keynes
MK17 8LX.

Tel:    +44 (0)1908 28 4013
Mbl:  +44 (0)7989 291 648
Fax:    +44 (0)1908 28 4393
E@:     mark.brewis () eds com

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