GHSA-5qmp-9x47-92q8 CVE-2025-23387 GO-2025-3489
Rancher's SAML-based login via CLI can be denied by unauthenticated users
- Severity
- 5.3 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.59%
- Chance of exploitation in the next 30 days. Higher than 48.29% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- Fix
2.8.13- Upgrade github.com/rancher/rancher to this version or later
Description
Impact
A vulnerability has been identified within Rancher where it is possible for an unauthenticated user to list all CLI authentication tokens and delete them before the CLI is able to get the token value. This effectively prevents users from logging in via the CLI when using rancher token as the execution command (instead of the token directly being in the kubeconfig).
Note that this token is not the kubeconfig token and if an attacker is able to intercept it they can't use it to impersonate a real user since it is encrypted.
This happens because for SAML-based authentication providers, the login flow from the CLI works by generating a link to be pasted in the browser, and then polling every 10 seconds for the /v3-public/authTokens/<token name> endpoint. The <token name> is randomly generated by the CLI. Once the login flow succeeds, Rancher creates an auth token (with an encrypted token value). The CLI then deletes the authToken.
Rancher deployments using only the local authentication provider, or non-SAML-based authentication providers, are not impacted by this vulnerability. SAML-based users not using the CLI are also not impacted.
Please consult the associated MITRE ATT&CK - Technique - Account Access Removal for further information about this category of attack.
Patches
The fix involves removing GET and DELETE methods for the authTokens collection.
Patched versions include releases v2.8.13, v2.9.7 and v2.10.3.
Workarounds
Users can refrain from using the Rancher CLI to log in as a workaround. Otherwise, users are advised to upgrade to a patched version of Rancher Manager.
References
If you have any questions or comments about this advisory:
- Reach out to the SUSE Rancher Security team for security related inquiries.
- Open an issue in the Rancher repository.
- Verify with our support matrix and product support lifecycle.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/rancher/rancher | >= 2.8.0, < 2.8.13 |
2.8.13 |
| github.com/rancher/rancher | >= 2.9.0, < 2.9.7 |
2.9.7 |
| github.com/rancher/rancher | >= 2.10.0, < 2.10.3 |
2.10.3 |
| github.com/rancher/rancher | all versions |
No fix yet |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/rancher/rancher Go → 2.8.13
- go
go get github.com/rancher/rancher@v2.8.13 && go mod tidy
Severity breakdown
CVSS 3.1 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Weakness
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
How to prevent it
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References
Advisories
Packages
Other links
- github.com/rancher/rancher/security/advisories/GHSA-5qmp-9x47-92q8
- github.com/rancher/rancher/pull/48616
- github.com/rancher/rancher/pull/48998
- github.com/rancher/rancher/pull/48999
- github.com/rancher/rancher/pull/49000
- github.com/rancher/rancher/commit/2481630c4a5a75d81eb69d10d7558ea833395a1e
- github.com/rancher/rancher/commit/bedd911b9b321436faa2d9e20a161f6ac396aa74
- github.com/rancher/rancher/commit/ceeedb1aa67c319f4873615f19c3f56a66f39706
- github.com/rancher/rancher/commit/dfa034d05a55b5e57990a1f700176dcd8e963dbc
- bugzilla.suse.com/show_bug.cgi
- github.com/rancher/rancher/releases/tag/v2.10.3
- github.com/rancher/rancher/releases/tag/v2.8.13
- github.com/rancher/rancher/releases/tag/v2.9.7
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-4j6x-2764-m8gh Rancher has over-inclusive team membership expansion in GitHub App authentication provider | High | Also affects github.com/rancher/rancher |
| GHSA-vx8h-4prv-g744 Rancher has Privilege Escalation from Project Owner to Host | High | Also affects github.com/rancher/rancher |
| GHSA-mhc6-2gfq-xx62 Rancher vulnerable to command injection through unsanitized YAML parameter | Critical | Also affects github.com/rancher/rancher |
| GHSA-5v3h-x4wf-5c35 Rancher Extensions have arbitrary file access via path traversal | High | Also affects github.com/rancher/rancher |
| GHSA-gqf8-rvrh-g7w6 Rancher cloud credentials can be used through proxy API by users without access | Critical | Also affects github.com/rancher/rancher |
| GHSA-hwm2-4ph6-w6m5 Rancher's restricted PodSecurityPolicy does not prevent containers from running as a privileged user | High | Also affects github.com/rancher/rancher |
| GHSA-mc24-7m59-4q5p Rancher CLI skips TLS verification on Rancher CLI login command | Medium | Also affects github.com/rancher/rancher |
| GHSA-mw39-9qc2-f7mg Rancher exposes sensitive information through audit logs | Medium | Also affects github.com/rancher/rancher |
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