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Re: [tor-bugs] #12227 [Tor]: ASan stack-buffer-overflow in prune_v2_cipher_list -- not exploitable

#12227: ASan stack-buffer-overflow in prune_v2_cipher_list  -- not exploitable
---------------------------+-------------------------------------
     Reporter:  starlight  |      Owner:
         Type:  defect     |     Status:  needs_review
     Priority:  normal     |  Milestone:  Tor: 0.2.5.x-final
    Component:  Tor        |    Version:  Tor: 0.2.4.22
   Resolution:             |   Keywords:  tor-client 024-backport
Actual Points:             |  Parent ID:
       Points:             |
---------------------------+-------------------------------------

Comment (by nickm):

 Replying to [comment:4 nickm]:
 > The SSLv23_method() call is later modified by the SSL_OP_NO_SSLv2 flag.

 Also: Using SSLv3_method() for our SSL objects would mean (IIUC) no TLS1;
 and using TLSv1_method() would mean no accepting SSLv3.  ISTR we had a
 ticket about that long ago.

 But IIUC, using SSLv3_method() or TLSv1_method() in
 prune_v2_cipher_lists() would seem to be a fine thing to do.

 Replying to [comment:5 cypherpunks]:

 >get_cipher_by_char for SSLv23 is wrong and shouldn't be used. It messes
 bytes and the same bytes shifts differently inside of cipher id.

 Can we just switch prune_v2_cipher_list() to use SSLv3_method or
 TLSv1_method() ?  It looks to me like that would work, but it's late, my
 brain is tired, and I haven't tested it yet.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12227#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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