+++ This bug was initially created as a clone of Bug #843126 +++ Description of problem: RHEL is prone to blind reset attacks. Blind reset attacks together with mitigations are described in RFC 5691. Please backport the Linux kernel upstream fixes below. Upstream fixes -------------- Implement the RFC 5691 mitigation against Blind Reset attack using RST bit. Upstream Linux kernel commit: 282f23c6ee343126156dd41218b22ece96d747e3 RFC 5961 3.2 Mitigation Implement the RFC 5691 mitigation against Blind Reset attack using SYN bit. Upstream Linux kernel commit: 0c24604b68fc7810d429d6c3657b6f148270e528 RFC 5961 4.2 Mitigation Followup of commit 0c24604b68fc (tcp: implement RFC 5961 4.2) Upstream Linux kernel commit: e371589917011efe6ff8c7dfb4e9e81934ac5855 0c24604b68fc follow up
Moving this to the next 2.2.x release. It's too late in our 2.2.0 cycle and will require quite some network testing, as the RFC5961 redefines slightly how to handle some specific RST/SYN situations (per QE).
Cherry-picked above commits for pending 2.2.2 errata
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2012-1491.html