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7.5

RKE2 supervisor port can be blocked by remote attacker

CVE-2023-32186 · published 3 years ago
Summary

The RKE2 service that runs on TCP port 6443 can be overwhelmed by an unauthenticated user, causing the service to stop responding. This stops management operations for your Kubernetes clusters. Update RKE2 to the latest patch release for your version or apply the vendor's recommended configuration changes to limit resource use on the supervisor port.

What to do
  • Update github.com rancher to version 1.24.17.
  • Update github.com rancher to version 1.25.13.
  • Update github.com rancher to version 1.26.8.
  • Update github.com rancher to version 1.27.5.
  • Update github.com rancher to version 1.28.1.
  • Update rancher github.com/rancher/rke2 to version 1.24.17.
  • Update rancher github.com/rancher/rke2 to version 1.25.13.
  • Update rancher github.com/rancher/rke2 to version 1.26.8.
  • Update rancher github.com/rancher/rke2 to version 1.27.5.
  • Update rancher github.com/rancher/rke2 to version 1.28.1.
Affected software
Ecosystem VendorProductAffected versions
go github.com rancher < 1.24.17
>= 1.25.0, < 1.25.13
>= 1.26.0, < 1.26.8
>= 1.27.0, < 1.27.5
>= 1.28.0, < 1.28.1
Fix: upgrade to 1.24.17
– suse rancher_rke2 >= 1.24.0\+rke2r1, < 1.24.17\+rke2r1
>= 1.25.0\+rke2r1, < 1.25.13\+rke2r1
>= 1.26.0\+rke2r1, < 1.26.8\+rke2r1
>= 1.27.1\+rke2r1, < 1.27.5\+rke2r1
1.28.1\+rke2r1
cpe:2.3:a:suse:rancher_rke2:*:*:*:*:*:*:*:*
Go rancher github.com/rancher/rke2 < 1.24.17
>= 1.25.0, < 1.25.13
>= 1.26.0, < 1.26.8
>= 1.27.0, < 1.27.5
>= 1.28.0, < 1.28.1
Fix: upgrade to 1.24.17
Original advisory text
RKE2 supervisor port is vulnerable to unauthenticated remote denial-of-service (DoS) attack via TLS SAN stuffing attack
A Allocation of Resources Without Limits or Throttling vulnerability in SUSE RKE2 allows attackers with access to K3s servers apiserver/supervisor port (TCP 6443) cause denial of service.
This issue affects RKE2: from 1.24.0 before 1.24.17+rke2r1, from v1.25.0 before v1.25.13+rke2r1, from v1.26.0 before v1.26.8+rke2r1, from v1.27.0 before v1.27.5+rke2r1, from v1.28.0 before v1.28.1+rke2r1.

References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
7.5 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-770Allocation of Resources Without Limits
Timeline
Published19 Sep 2023
Updated4 Nov 2026
First seen6 Mar 2026
Sources
GHSA-p45j-vfv5-wprq · GHSA
CVE-2023-32186 · NVD
GHSA-p45j-vfv5-wprq · OSV
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