Date: Sun, 14 Aug 2016 21:36:39 +0200 From: Sona Sarmadi <sona.sarmadi@...a.com> To: <oss-security@...ts.openwall.com> Subject: Re: CVE-2016-5696: linux kernel - challange ack information leak. Hi all, This vulnerability is currently only fixed in mainline kernels (4.7 & 4.8). Does anyone know if there is any work ongoing to backport this fix to the older versions? Thanks //Sona On 2016-07-12 06:33, Wade Mealing 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://email@example.com/msg118677.html
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