Re: CVE-2016-5389: linux kernel - challange ack information leak.

[Wade Mealing <wmealing () redhat com>]

I've since been contacted by the researcher and have been told that
CVE-2016-5696 was reserved by mitre for this issue.  I'd like to
withdraw the usage of this CVE number and use CVE-2016-5696.

Sorry for any confusion.

Wade Mealing

On Tue, Jul 12, 2016 at 2:33 PM, Wade Mealing <wmealing () redhat com> wrote:
> Gday,
>
> Red Hat Product Security has been made aware of an important issue in
> the Linux kernel's implementation of challenge ACKS as specified in
> RFC 5961. An attacker which knows a connections client IP, server IP
> and server port can abuse the challenge ACK mechanism
> to determine the accuracy of a normally 'blind' attack on the client or server.
>
> Successful exploitation of this flaw could allow a remote attacker to
> inject or control a TCP stream contents in a connection between a
> Linux device and its connected client/server.
>
> * This does NOT mean that cryptographic information is exposed.
> * This is not a Man in the Middle (MITM) attack.
>
> This was reported to Red Hat by Yue Cao, part of the Cyber Security
> Group in the University of California
>
> Thanks,
>
> Wade Mealing
> Red Hat Product Security Team
>
> Red Hat Bugzilla:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1354708
>
> Patch:
>
> https://www.mail-archive.com/netdev () vger kernel org/msg118677.html