A vulnerability has been found in Rancher 2.1.4 and classified as critical. Affected by this vulnerability is an unknown function of the component Login. The manipulation of the argument errorMsg as part of a Special Char leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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to lure legitimate users to visit phishing sites with scare tactics, e.g., displaying a "This version of Rancher is outdated, please visit https://malicious.rancher.site/upgrading" message.

The weakness was published 06/10/2019 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2019-11881 since 05/10/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at VDB-247108, VDB-248186, VDB-249130 and VDB-249183.

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• Rancher

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• 2.1.4

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