Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openvswitch | Openvswitch | >= 2.7.0, <= 2.7.6 |
| Redhat | Openstack | 10 |
| Canonical | Ubuntu Linux | 16.04 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2018:3500Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0053Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0081Third Party Advisory
- https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/3873-1/Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3500Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0053Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0081Third Party Advisory
- https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/3873-1/Third Party Advisory
FAQ
What is CVE-2018-17204?
CVE-2018-17204 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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...
How severe is CVE-2018-17204?
CVE-2018-17204 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-17204?
Check the references section above for vendor advisories and patch information. Affected products include: Openvswitch Openvswitch, Redhat Openstack, Canonical Ubuntu Linux, Debian Debian Linux.