# CVE-2018-17204: openvswitch-common: An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in...

CVE-2018-17204 is fixed in 14 products on 1 platform, first by openvswitch-common 2.9.2-0ubuntu0.18.04.3, released September 18, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-17204
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0191
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2018

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openvswitch-common Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-common 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-common-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-pki Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-pki 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-pki-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-switch Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-switch 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-switch-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-switch-dpdk Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-switch-dpdk 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-switch-dpdk-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-test Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-test 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-test-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-testcontroller Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-testcontroller 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-testcontroller-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | openvswitch-vtep Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [openvswitch-vtep 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openvswitch-vtep-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | ovn-central Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [ovn-central 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ovn-central-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | ovn-common Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [ovn-common 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ovn-common-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | ovn-controller-vtep Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [ovn-controller-vtep 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ovn-controller-vtep-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | ovn-docker Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [ovn-docker 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ovn-docker-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | ovn-host Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [ovn-host 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ovn-host-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | python-openvswitch Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [python-openvswitch 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-openvswitch-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |
| Linux | python3-openvswitch Ubuntu 18.04.6 LTS (bionic) | 2.9.2-0ubuntu0.18.04.3 | [python3-openvswitch 2.9.2-0ubuntu0.18.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-openvswitch-2.9.2-0ubuntu0.18.04.3.md) | Sep 18, 2018 |

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