CVE-2018-17204

Publication date 19 September 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openvswitch	18.10 cosmic	Not affected
	18.04 LTS bionic	Fixed 2.9.2-0ubuntu0.18.04.3
	16.04 LTS xenial	Fixed 2.5.5-0ubuntu0.16.04.2
	14.04 LTS trusty	Not in release

Notes

mdeslaur

openflow 1.5 not enabled by default

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openvswitch	Upstream: 9740d81 Upstream: 8976ea1 Upstream: 4af6da3 Upstream: 0e6eb58 Upstream: 94b4430

Severity score breakdown

Parameter	Value
Base score	4.3 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L