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Security Assessment of the IPv6 Flow Label (draft-gont-6man-flowlabel-security-00)

Security Assessment of the IPv6 Flow Label (draft-gont-6man-flowlabel-security-00). Fernando Gont on behalf of UK CPNI IETF 79 November 7-12, 2010. Beijing,China. Summary. Document is part of a larger document on IPv6 security being produced by UK CPNI (yet unpublished)

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Security Assessment of the IPv6 Flow Label (draft-gont-6man-flowlabel-security-00)

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  1. Security Assessment of the IPv6 Flow Label(draft-gont-6man-flowlabel-security-00) Fernando Gont on behalf of UK CPNI IETF 79 November 7-12, 2010. Beijing,China.

  2. Summary • Document is part of a larger document on IPv6 security being produced by UK CPNI (yet unpublished) • Analyzes the security implications of the Flow Label field • Proposes an algorithm for selecting flow labels

  3. Security Implications of the Flow Label field • Possible (theoretical) DoS vector resulting from Flow Label verification described in RFC 2460 • Covert Channels • QoS theft • Information leaking

  4. Selecting Flow Labels • Requirements: • Flow Labels that are predictable by off-path attackers • Flow Label collisions are reduced • Proposed algorithm (a la RFC 1948, and compliant with RC 3697): Flow Label = counter + hash(Source Address, Destination Address, Secret Key)

  5. Moving forward • Comments? • Adopt as wg item?

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