Nortel Networks 7.11, 7.05 manual Threats Addressed by the TOE Environment, T.Hack, Te.Physical

Security Target, Version 3.9 March 18, 2008

Attackers who are not TOE users: These attackers have no knowledge of how the TOE operates and are assumed to possess a low skill level, a low level of motivation, limited resources to alter TOE configuration settings/parameters, and no physical access to the TOE.

TOE users: These attackers have extensive knowledge of how the TOE operates and are assumed to possess a high skill level, moderate resources to alter TOE configuration settings/parameters, and physical access to the TOE, but no motivation to do so.

The threats are mitigated through the objectives identified in Section 4 - Security Objectives.

3.2.1 Threats Addressed by the TOE

The following threats are to be addressed by the TOE:

T.UNDETECT An attacker may gain undetected access due to missing, weak, and/or incorrectly implemented access controls for the restricted files or TSF Data in order to cause violations of integrity, confidentiality, or availability of the information protected by and flowing through the TOE.

T.AUTH-ERRORAn authorized user may accidentally alter the configuration of a policy that permits or denies information flow through the TOE, thereby affecting the integrity of the transmitted information.

T.DATA-MODAn attacker may intercept and alter the data transmitted between the Nortel VPN Client and the Nortel VPN Router, and/or between two Nortel VPN Routers, in order to deceive the intended recipient.

T. HACK-CRYPTOAn attacker may successfully intercept and decrypt, then recover and modify the encrypted data that is in transit between the Nortel VPN Router and VPN Client, and/or between two Nortel VPN Routers.

T.HACK	An attacker may use malformed IP packets or similar attack methods against the TSF or
	user data protected by the TOE in order to corrupt normal operation.

3.2.2 Threats Addressed by the TOE Environment

The following threats are addressed by the TOE environment:

TE.PHYSICAL	An attacker may physically attack the Hardware appliance in order to compromise its
	secure operation.
TE.AUDIT_FAILURE	An attacker may conduct an undetected attack on the information protected by the TOE
	as a result of unreliable time stamps used by the audit mechanism, which may result in
	failure to prevent further attacks using the same method.
TE.BAD_CERT	An attacker may successfully authenticate to the VPN Router using a revoked, expired
	or untrusted certificate in order to gain access to information residing on the private
	network.
Nortel VPN Router v7.05 and Client Workstation v7.11		Page 17 of 67
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