Vulnerability Report

CVE-2018-17205

Title: Redhat Openstack

Other

Proof Of Concept

No public PoC currently indexed for CVE-2018-17205.

CWE Category CWE-617
Published Date Sep 19, 2018
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 7.5 CVSS v3.0
Exploit Probability (EPSS)
2.53%

Vulnerability Summary

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.

Impacted Vendors

O
openvswitch 1
R
redhat 1
O
openstack 1

Reference Links

https://access.redhat.com/errata/RHSA-2018:3500 https://access.redhat.com/errata/RHSA-2019:0053 https://access.redhat.com/errata/RHSA-2019:0081 https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 https://usn.ubuntu.com/3873-1/ https://access.redhat.com/errata/RHSA-2018:3500 https://access.redhat.com/errata/RHSA-2019:0053 https://access.redhat.com/errata/RHSA-2019:0081 https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6 https://usn.ubuntu.com/3873-1/
CVSS v3.0
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
5.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2018-17205 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.