Trusted servers exchange can be triggered by attacker

2021-06-01T18:14:21
ID GHSA-J875-VR2Q-H6X6
Type nextcloud
Reporter Nextcloud
Modified 2021-06-01T18:14:21

Description

Description

Impact

Nextcloud supports sharing of the registered users with other Nextcloud servers. Nextcloud supports adding these automated when selecting the "Add server automatically once a federated share was created successfully" setting.

As a public link can be added as federated share, an attacker can trigger this exchange if they have access to a public link. Thus getting access to basic user information.

Patches

It is recommended that the Nextcloud Server is upgraded to 19.0.11, 20.0.10 or 21.0.2

Workarounds

Disable "Add server automatically once a federated share was created successfully" in the Nextcloud settings.

References

For more information

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