Re: [Openvpn-devel] OpenVPN affected? - Incorrect checks for malformed signatures in OpenSSL

2009-01-20 Thread Andrzej Chmielowiec

Hi,

OpenVPN can use DSA certificates if you choose one of the following 
--tls-cipher:


   DHE-DSS-AES256-SHA
   EDH-DSS-DES-CBC3-SHA
   DHE-DSS-AES128-SHA
   EDH-DSS-DES-CBC-SHA
   EXP-EDH-DSS-DES-CBC-SHA

If someone use one of the above sipher suite, then he should change OpenSSL
version to 0.9.8j.

By the way, do you plan to add my patch with ECDH support to OpenVPN?

Regards,
Andrzej Chmielowiec

I don't believe this issue significantly affects OpenVPN.  OpenVPN does 
not use the EVP_VerifyFinal function.  The issue is that some internal 
OpenSSL functions do not properly check the return value of this 
function.  The issue is primarily of concern if you are using DSA or 
ECDSA certificates, however these are not generally used with OpenVPN 
(OpenVPN uses RSA certificates and does not currently support DSA or 
ECDSA certificates).


James

Michael A. Gütlbauer wrote:
  

Hallo!

I'm sure, you know the "OpenSSL Security Advisory [07-Jan-2009]" 
(http://www.openssl.org/news/secadv_20090107.txt)


Because there's absolutely no information on your website, whether 
OpenVPN is affected and/or a bug-fix will be available, I'd like to ask 
you to do so.


Many thanks!

Michael



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Re: [Openvpn-devel] OpenVPN affected? - Incorrect checks for malformed signatures in OpenSSL

2009-01-14 Thread James Yonan
I don't believe this issue significantly affects OpenVPN.  OpenVPN does 
not use the EVP_VerifyFinal function.  The issue is that some internal 
OpenSSL functions do not properly check the return value of this 
function.  The issue is primarily of concern if you are using DSA or 
ECDSA certificates, however these are not generally used with OpenVPN 
(OpenVPN uses RSA certificates and does not currently support DSA or 
ECDSA certificates).


James

Michael A. Gütlbauer wrote:

Hallo!

I'm sure, you know the "OpenSSL Security Advisory [07-Jan-2009]" 
(http://www.openssl.org/news/secadv_20090107.txt)


Because there's absolutely no information on your website, whether 
OpenVPN is affected and/or a bug-fix will be available, I'd like to ask 
you to do so.


Many thanks!

Michael