openvswitch: Always-Incorrect Control Flow Implementation
CVE-2023-1668 is a high-severity always-incorrect control flow implementation vulnerability in openvswitch, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.22% chance of exploitation within 30 days, higher than 69% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Open Vswitch to 2.13.11 or 2.14.9 or 2.15.8 or 2.16.7, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Openvswitch | openvswitch | Not specified in the record | Not stated |
| Cloudbase | Open Vswitch | 1.5.0 up to, but not including, 2.13.11; 2.14.0 up to, but not including, 2.14.9; 2.15.0 up to, but not including, 2.15.8; 2.16.0 up to, but not including, 2.16.7; 2.17.0 up to, but not including, 2.17.6; 3.0.0 up to, but not including, 3.0.4; 3.1.0 | 2.13.11, 2.14.9, 2.15.8, 2.16.7, 2.17.6, 3.0.4 |
| Debian | Debian Linux | 11.0 | Not stated |
| Red Hat | Openshift Container Platform | 4.0 | Not stated |
| Red Hat | Openstack Platform | 16.1; 16.2; 17.0 | Not stated |
| Red Hat | Virtualization | 4.0 | Not stated |
| Red Hat | Fast Datapath | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.2 | High | NVD |
| CVSS 3.1 | 8.2 | High | CISA (ADP) |
Official description
A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Always-Incorrect Control Flow Implementation
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
More Always-Incorrect Control Flow Implementation vulnerabilities (CWE-670)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- openwall.com/lists/oss-security/2023/04/06/1Mailing List, Mitigation
Third-party and government advisories
- bugzilla.redhat.com/show_bug.cgi?id=2137666Issue Tracking, Third Party Advisory
- debian.org/security/2023/dsa-5387Third Party Advisory
Other references
Other vulnerabilities in openvswitch
- 7.5 High severity
Recent Always-Incorrect Control Flow Implementation vulnerabilities
- 8.8 High severity
- 7.3 High severity
- 7.8 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.5 High severity
Spotted an error? Tell us.