[mpls] Re: Potential MNA security issue

[Tony Li <[e-mail]>]

There is text discussing this issue in the security considerations section of the framework document.

T


> On Feb 27, 2025, at 8:34 AM, Joel Halpern - jmh at joelhalpern.com <[e-mail]> wrote:
> 
> This seems a valid point, and good suggestions for mitigation.  I believe it applies to both ISD and PSD.
> 
> Yours,
> 
> Joel
> 
> On 2/27/2025 11:05 AM, [e-mail] wrote:
>> Sorry, the email somehow got sent too soon.Re-sending
>> 
>> 
>> Hi all,
>> 
>> There may be a security issue with ISD in the context of VPN Carrier's Carrier.
>> Spec does not seem to handle independence between the CE MPLS domain and the PE MPLS domain.
>> So it seems like the CE/Customer would be able to inject any MNA in the stack and this MNA would be interpreted by the provider MPLS domain. Given the possibly broad applicability of MNA, this may be a significant security issue.
>> Granted, VPN Carrier's Carrier is a niche deployment, but the document should probably raise that security point and possibly suggest options (e.g, MNA disabled in the SP domain, or packets with MNA dropped by the PE. I.e., essentially forbidding the use of MNA by the customer, call for future extensions...).
>> 
>> Thanks,
>> Regards,
>> --Bruno
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