oss-security - Linux kernel: CVE-2018-1065 - netfilter rule insertion may panic system.

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Date: Mon, 05 Mar 2018 05:15:13 +0000
From: Wade Mealing <wmealing@...hat.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: Linux kernel: CVE-2018-1065 - netfilter rule insertion may panic system.

This flaw was reported to nedev via syzbot (the Syzkaller fuzzer). It is
possible that a user with the capabilities to insert iptables/netfilter
rules is able to insert a rule that can jump to a non user-user
chain/invalid chain.  This is not possible using the iptables/netfilter
libitc code, however it is possible via setsockopt with the appropriate
capabilities set.

The bug is not specific to SCTP it is just coincidental that the syzcaller
code has tripped it using this path. The patches fix both ipv6 and ipv4
paths that are able to trigger the issue.

Thanks

Report:
http://lists.openwall.net/netdev/2018/01/27/46

Proposed patch:
<http://patchwork.ozlabs.org/patch/870355/>
http://patchwork.ozlabs.org/patch/870355/

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