7.5
HIGH
CVE-2018-17205
Open vSwitch (OvS) Rule State Assertion Failure Denial of Service
Description

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.

INFO

Published Date :

Sept. 19, 2018, 4:29 p.m.

Last Modified :

Nov. 21, 2024, 3:54 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2018-17205 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Canonical ubuntu_linux
1 Redhat openstack
1 Openvswitch openvswitch
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2018-17205.

URL Resource
https://access.redhat.com/errata/RHSA-2018:3500 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0053 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0081 Third Party Advisory
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 Exploit Patch Third Party Advisory
https://usn.ubuntu.com/3873-1/ Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3500 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0053 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0081 Third Party Advisory
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 Exploit Patch Third Party Advisory
https://usn.ubuntu.com/3873-1/ Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2018-17205 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2018-17205 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2018:3500
    Added Reference https://access.redhat.com/errata/RHSA-2019:0053
    Added Reference https://access.redhat.com/errata/RHSA-2019:0081
    Added Reference https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6
    Added Reference https://usn.ubuntu.com/3873-1/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CPE Deprecation Remap by [email protected]

    Aug. 04, 2021

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:redhat:openstack:13.0:*:*:*:*:*:*:* OR *cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Oct. 15, 2020

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:redhat:virtualization:4.0:*:*:*:*:*:*:* OR *cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
  • CWE Remap by [email protected]

    Oct. 03, 2019

    Action Type Old Value New Value
    Changed CWE CWE-20 CWE-20 CWE-617
  • Modified Analysis by [email protected]

    Mar. 07, 2019

    Action Type Old Value New Value
    Changed Reference Type https://usn.ubuntu.com/3873-1/ No Types Assigned https://usn.ubuntu.com/3873-1/ Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
  • CVE Modified by [email protected]

    Jan. 31, 2019

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/3873-1/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 29, 2019

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://access.redhat.com/errata/RHSA-2019:0053 No Types Assigned https://access.redhat.com/errata/RHSA-2019:0053 Third Party Advisory
    Changed Reference Type https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 No Types Assigned https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 Exploit, Patch, Third Party Advisory
    Changed Reference Type https://access.redhat.com/errata/RHSA-2019:0081 No Types Assigned https://access.redhat.com/errata/RHSA-2019:0081 Third Party Advisory
    Changed Reference Type https://access.redhat.com/errata/RHSA-2018:3500 No Types Assigned https://access.redhat.com/errata/RHSA-2018:3500 Third Party Advisory
    Added CWE CWE-20
    Added CPE Configuration OR *cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:* versions from (including) 2.7.0 up to (including) 2.7.6
    Added CPE Configuration OR *cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openstack:13.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:virtualization:4.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jan. 17, 2019

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2019:0081 [No Types Assigned]
    Added Reference https://access.redhat.com/errata/RHSA-2019:0053 [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 06, 2018

    Action Type Old Value New Value
    Added Reference https://access.redhat.com/errata/RHSA-2018:3500 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2018-17205 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2018-17205 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.54 }} 0.20%

score

0.77048

percentile

CVSS30 - Vulnerability Scoring System
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