GHSA-gqf8-rvrh-g7w6 CVE-2021-25320 GO-2026-4589
Rancher cloud credentials can be used through proxy API by users without access
- Severity
- 9.9 / 10
- Critical · CVSS 3.1
- Exploit chance (EPSS)
- 0.85%
- Chance of exploitation in the next 30 days. Higher than 58.38% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-284 Improper Access Control
- Fix
2.4.16- Upgrade github.com/rancher/rancher to this version or later
Description
A vulnerability was discovered in Rancher 2.2.0 through the aforementioned patched versions, where cloud credentials weren't being properly validated through the Rancher API. Specifically through a proxy designed to communicate with cloud providers. Any Rancher user that was logged-in and aware of a cloud-credential ID that was valid for a given cloud provider, could call that cloud provider's API through the proxy API, and the cloud-credential would be attached. The exploit is limited to valid Rancher users. There is not a direct mitigation outside of upgrading to the patched Rancher versions.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/rancher/rancher | >= 2.2.0, < 2.4.16 |
2.4.16 |
| github.com/rancher/rancher | >= 2.5.0, < 2.5.9 |
2.5.9 |
| github.com/rancher/rancher | >= 2.2.0+incompatible |
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 → 2.4.16
- go
go get github.com/rancher/rancher@v2.4.16 && go mod tidy
Severity breakdown
CVSS 3.1 9.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Weakness
CWE-284: Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
How to prevent it
- Architecture and Design, Operation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- 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
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-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 |
| GHSA-j4vr-pcmw-hx59 Rancher user retains access to clusters despite Global Role removal | Medium | Also affects github.com/rancher/rancher |
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