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GHSA-w2rr-38wv-8rrp
No affected components available
Impact
The APIExport Virtual Workspace can be used to manage objects in workspaces that bind that APIExport for resources defined in the APIExport or specified and accepted via permission claims. This allows an API provider (via their APIExport) scoped down access to workspaces of API consumers to provide their services properly.
The identified vulnerability allows creating or deleting an object via the APIExport VirtualWorkspace in any arbitrary target workspace for pre-existing resources. By design, this should only be allowed when the workspace owner decides to give access to an API provider by creating an APIBinding.
With this vulnerability, it is possible for an attacker to create and delete objects even if none of these requirements are satisfied, i.e. even if there is no APIBinding in that workspace at all or the workspace owner has created an APIBinding, but rejected a permission claim.
Patches
A fix for this issue has been identified and has been published with kcp 0.26.3 and 0.27.0.
Workarounds
For users unable to upgrade to one of the patched versions, the following guidance can be given:
- Minimise the set of people with
apiexport/contentsub-resource access toAPIExportresources. Be aware that this has to apply to all workspaces to be effective. - Filter incoming requests in a reverse proxy with a similar logic as the authorizer added in the referenced pull request.
References
See pull request (https://github.com/kcp-dev/kcp/pull/3338).
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level 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.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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