CVE-2018-17204

Published: 19 September 2018

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the type and command earlier, when it might still be invalid. This causes an assertion failure (via OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default.

Priority

Medium

CVSS 3 base score: 4.3

Status

Package Release Status
openvswitch
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver)
Released (2.9.2-0ubuntu0.18.04.3)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (2.5.5-0ubuntu0.16.04.2)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was not-affected [code not present])
Patches:
Upstream: https://github.com/openvswitch/ovs/commit/9740d81d94888cb158fa99a9366fe2b32b3e4aaa (master)
Upstream: https://github.com/openvswitch/ovs/commit/8976ea1d680ab7a2d726a50e5666aa8fefd24168 (branch-2.8)
Upstream: https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde (branch-2.7)
Upstream: https://github.com/openvswitch/ovs/commit/0e6eb58f53d63b79d3a8c6936b0ef72cdd082bdb (2.9)
Upstream: https://github.com/openvswitch/ovs/commit/94b443070fea2a15bc4768c35d59d46892cdc901 (2.5)