CVE-2018-17204

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.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.19% Top 25%
Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2019:0053 third party advisory vendor advisory
https://usn.ubuntu.com/3873-1/ third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2018:3500 third party advisory vendor advisory
https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde third party advisory patch
https://access.redhat.com/errata/RHSA-2019:0081 third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2018-17204?
CVE-2018-17204 has been scored as a medium severity vulnerability.
How to fix CVE-2018-17204?
To fix CVE-2018-17204, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-17204 being actively exploited in the wild?
It is possible that CVE-2018-17204 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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