Date: Tue, 12 Jul 2016 14:33:54 +1000 From: Wade Mealing <wmealing@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2016-5389: linux kernel - challange ack information leak. 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@...r.kernel.org/msg118677.html
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