CVE-2019-11881
First published: Mon Jun 10 2019(Updated: )
A vulnerability exists in Rancher 2.1.4 in the login component, where the `errorMsg` parameter can be tampered to display arbitrary content, filtering tags but not special characters or symbols. There's no other limitation of the message, allowing malicious users to lure legitimate users to visit phishing sites with scare tactics, e.g., displaying a "This version of Rancher is outdated, please visit https://malicious.rancher.site/upgrading" message. **PoC** 1. Access the following endpoint on any Rancher instance up to 2.1.4: `https://RANCHER:PORT/login?errorMsg=%68%74%74%70%73%3a%2f%2f%77%77%77%2e%6f%77%61%73%70%2e%6f%72%67%2f%69%6e%64%65%78%2e%70%68%70%2f%57%65%62%5f%50%61%72%61%6d%65%74%65%72%5f%54%61%6d%70%65%72%69%6e%67` It will display a [link](https://www.owasp.org/index.php/Web_Parameter_Tampering) to OWASP Wiki explaining Web Parameter Tampering.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| SUSE Rancher | =2.1.4 | |
| go/github.com/rancher/rancher | <=2.1.4 |
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Reference Links
- https://github.com/MauroEldritch/VanCleef
- https://github.com/rancher/rancher/issues/20216
- https://nvd.nist.gov/vuln/detail/CVE-2019-11881
- https://github.com/advisories/GHSA-2p4g-jrmx-r34m (Advisory)
- https://github.com/rancher/rancher/commit/e59adbc7565251919d84d6e353421104be8da06e
- https://github.com/rancher/rancher/blob/v2.2.4/pkg/auth/providers/saml/saml_client.go#L282
Frequently Asked Questions
What is CVE-2019-11881?
CVE-2019-11881 is a vulnerability in Rancher 2.1.4 in the login component where the errorMsg parameter can be tampered to display arbitrary content.
What is the severity of CVE-2019-11881?
The severity of CVE-2019-11881 is medium with a severity value of 4.7.
How does CVE-2019-11881 affect Rancher 2.1.4?
CVE-2019-11881 affects Rancher 2.1.4 in the login component, allowing the errorMsg parameter to be tampered with.
How can CVE-2019-11881 be exploited?
CVE-2019-11881 can be exploited by malicious users tampering with the errorMsg parameter in the login component of Rancher 2.1.4.
Are there any references or resources available for CVE-2019-11881?
Yes, there are references available for CVE-2019-11881. You can find them at: https://github.com/MauroEldritch/VanCleef and https://github.com/rancher/rancher/issues/20216
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