Two possible vulnerabilities in OpenSSL?

[Peter Malone]

It's no longer implemented in OpenSSL, however some of the versions
which were not vulnerable to Heartbleed are impacted.

Also the latest version of Ruby and Android implement it.

https://android.googlesource.com/platform/external/openssl/+/android-4.4.2_r2/ssl/ssl_lib.c



On Thu, 2014-04-10 at 15:16 +0200, tpb-crypto at laposte.net wrote:
> 
> > Message du 10/04/14 13:11
> > De : "Peter Malone" 
> 
> > A : "cypherpunks at cpunks.org" 
> > Copie à : 
> > Objet : Two possible vulnerabilities in OpenSSL?
> >
> 
> > Hey there,
> > 
> > I was auditing OpenSSL last night. I looked at several files and found
> > the following:
> > 
> > https://github.com/openssl/openssl/blob/master/ssl/t1_lib.c#L2893
> > /* Determine if we need to see RI. Strictly speaking if we want to 
> > * avoid an attack we should *always* see RI even on initial server 
> > * hello because the client doesn't see any renegotiation during an 
> > * attack. However this would mean we could not connect to any server 
> > * which doesn't support RI so for the immediate future tolerate RI 
> > * absence on initial connect only. 
> > */ 
> > 
> > Well that's awful coding.
> > 
> > Unless I'm mistaken, the following memcmp is vulnerable to a remote
> > timing attack.
> > https://github.com/openssl/openssl/blob/master/ssl/ssl_lib.c#L1974
> > static int ssl_session_cmp(const SSL_SESSION *a,const SSL_SESSION *b) 
> > { 
> > if (a->ssl_version != b->ssl_version) 
> > return(1); 
> > if (a->session_id_length != b->session_id_length) 
> > return(1); 
> > return(memcmp(a->session_id,b->session_id,a->session_id_length)); 
> > } 
> > 
> > I posted both of these findings to the full disclosure list last night.
> > I figured someone on this list might find it interesting as well.
> > 
> > Cheers,
> > Peter.
> > 
> > 
> 
> Your best bet would be to make an automated exploit for proof-of-concept. If it allows skiddies to prank systems, people will rush to correct it and your name will be in the headlines for your 15 minutes of fame.