Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Sun, 13 Apr 2014 10:44:54 +0400
From: Solar Designer <>
Subject: Re: Use-after-free race condition,in OpenSSL's read buffer

On Sat, Apr 12, 2014 at 09:47:49PM -0600, Scotty Bauer wrote:
> Patch is available at:

Some context to this:

This specific patch is found in Benson Kwok's bug report:

Benson writes:

"The issue is when the buffer is released by ssl3_release_read_buffer(),
there may still be data left in the buffer (s->s3->rbuf.left != 0). With
single threading, when another read occurs, the same buffer is reused
during a call to ssl3_setup_read_buffer() so the data is still there and
can be read and processed so it works fine. When running with multiple
threads, the buffer is shared in a pool and another thread may have gotten
that buffer already. If the call to ssl3_setup_read_buffer() returns a new
buffer, it assume the data is still there but will run into parsing error
with the record."

(Of course, "parsing error" isn't necessarily the worst outcome.)


Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.