CVE-2018-17204

Publication date 19 September 2018

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.3 · Medium

Score breakdown

Description

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

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

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.3 · Medium

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

    • USN-3873-1
    • Open vSwitch vulnerabilities
    • 30 January 2019

Other references

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