Vulnerability in Openvswitch
CVE-2018-17204
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.
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.019 (79.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Openvswitch
- Canonical Ubuntu Linux — versions 16.04, 18.04
- Debian Linux — versions 9.0
- Red Hat OpenStack — versions 10, 13
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2019:0053 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3873-1/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:3500 (vendor-advisory, Third Party Advisory)
- github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde (Patch, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0081 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00032.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-17204?
- CVE-2018-17204 is a medium-severity vulnerability in Openvswitch, classified under Reachable Assertion. CVSS score: 4.3/10. Published 2018-09-19.
- How severe is CVE-2018-17204?
- Medium severity. CVSS v3 base score is 4.3 out of 10.