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GHSA-95fc-g4gj-mqmx
No affected components available
Impact
A vulnerability has been identified in Steve where by default it was using an insecure option that did not validate the certificate presented by the remote server while performing a TLS connection. This could allow the execution of a man-in-the-middle (MitM) attack against services using Steve.
For example, Rancher relies on Steve as a dependency for its user interface (UI) to proxy requests to Kubernetes clusters. Users who have the permission to create a service in Rancher’s local cluster can take over Rancher’s UI and display their own UI to gather sensitive information. This is only possible when the setting ui-offline-preferred is manually set to remote (by default Rancher sets it to dynamic). This enables further attacks such as cross-site scripting (XSS), or tampering the UI to collect passwords from other users etc.
Please consult the associated MITRE ATT&CK - Technique - Adversary-in-the-Middle for further information about this category of attack.
Patches
Patched versions of Steve include releases v0.2.1, v0.3.3, v0.4.4 and v0.5.13.
This vulnerability is addressed by changing Steve to always verify a server’s certificate based on Go’s TLS settings.
Workarounds
If you can't upgrade to a fixed version, please make sure that you are only using Steve to connect to trusted servers.
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.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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