CVE-2019-11881

Public Exploit

Description

A vulnerability exists in Rancher before 2.2.4 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to lure legitimate users to visit phishing sites with scare tactics, e.g., displaying a "This version of Rancher is outdated, please visit https://malicious.rancher.site/upgrading" message.

4.7

CVSS

Severity: Medium

CVSS 3.0 •

CVSS 2.0 •

EPSS 5.54% Top 15%

Third-Party Advisory github.com Third-Party Advisory github.com

Affected: n/a n/a

References

Link	Tags
https://github.com/MauroEldritch/VanCleef	third party advisory
https://github.com/rancher/rancher/issues/20216	third party advisory issue tracking exploit
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 the severity of CVE-2019-11881?: CVE-2019-11881 has been scored as a medium severity vulnerability.
How to fix CVE-2019-11881?: To fix CVE-2019-11881, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-11881 being actively exploited in the wild?: It is possible that CVE-2019-11881 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~6% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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