Bugtraq: Re: EEYE: Microsoft ASN.1 Library Length Overflow Heap Corruption

[Peter Pentchev <roam () ringlet net>]

On Wed, Feb 11, 2004 at 09:16:40AM +1100, Tim Eddy wrote:
> Marc,
>
> If we remove the default exemptions for Kerberos & RSVP from IPSEC with
> the "NoDefaultExempt" registry key, this still passes IKE. Therefore is
> IKE vulnerable to the ASN bug?
It would appear that it is indeed.  The Internet Key Exchange protocol
is defined in RFC 2409, and section 5.2, "Phase 1 Authentication With
Public Key Encryption", states that "RSA encryption MUST be encoded in
PKCS #1 format".  The PKCS #1 standard always uses ASN.1 to encode
the keys and signature schemes used.

G'luck,
Peter

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Peter Pentchev  roam () ringlet net    roam () sbnd net    roam () FreeBSD org
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