Fwd: GNU Libtasn1 2.12 released

Nikos Mavrogiannopoulos nmav at gnutls.org
Tue Mar 20 18:41:21 CET 2012

On 03/20/2012 09:20 AM, Tomas Hoger wrote:

>> Note that the bug fixed affects all gnutls versions.
> Nikos, should the above be read as "all gnutls versions include
> libtasn1 versions affected by this problem" or "gnutls uses
> asn1_get_length_der incorrectly too"? 

I don't think gnutls uses asn1_get_length_der(). It is libtasn1
that was using asn1_get_length_der() internally in an incorrect
way. Because of that all programs using libtasn1 are vulnerable
including gnutls.

> Have you managed to
> confirm the issue in gnutls and can possibly comment on known
> possible impacts (e.g. TLS client can trigger this on TLS server
> by providing a crafted client certificate during handshake)?

Yes, certificate parsing crashes gnutls with the vulnerable libtasn1.


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