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Vulnerability Details : CVE-2018-17205

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.
Publish Date : 2018-09-19 Last Update Date : 2019-10-02
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 617

- Products Affected By CVE-2018-17205

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 16.04 ~~lts~~~ Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 18.04 ~~lts~~~ Version Details Vulnerabilities
3 Application Openvswitch Openvswitch 2.7.0 Version Details Vulnerabilities
4 Application Openvswitch Openvswitch 2.7.1 Version Details Vulnerabilities
5 Application Openvswitch Openvswitch 2.7.2 Version Details Vulnerabilities
6 Application Openvswitch Openvswitch 2.7.3 Version Details Vulnerabilities
7 Application Openvswitch Openvswitch 2.7.4 Version Details Vulnerabilities
8 Application Openvswitch Openvswitch 2.7.5 Version Details Vulnerabilities
9 Application Openvswitch Openvswitch 2.7.6 Version Details Vulnerabilities
10 Application Redhat Openstack 10 Version Details Vulnerabilities
11 Application Redhat Openstack 13.0 Version Details Vulnerabilities
12 OS Redhat Virtualization 4.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 2
Openvswitch Openvswitch 7
Redhat Openstack 2
Redhat Virtualization 1

- References For CVE-2018-17205

https://usn.ubuntu.com/3873-1/
UBUNTU USN-3873-1
https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6
https://access.redhat.com/errata/RHSA-2019:0081
REDHAT RHSA-2019:0081
https://access.redhat.com/errata/RHSA-2018:3500
REDHAT RHSA-2018:3500
https://access.redhat.com/errata/RHSA-2019:0053
REDHAT RHSA-2019:0053

- Metasploit Modules Related To CVE-2018-17205

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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