CVE-2017-0883: Medium severity nextcloud server vulnerability
Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue. A permission related issue within the OCS sharing API allowed an authenticated adversary to reshare shared files with an increasing permission set. This may allow an attacker to edit files in a share despite having only a 'read' permission set. Note that this only affects folders and files that the adversary has at least read-only permissions for.
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2017-0883?
CVE-2017-0883 is rated as moderate severity due to the potential for unauthorized access and modification of shared files.
How do I fix CVE-2017-0883?
To fix CVE-2017-0883, upgrade Nextcloud Server to version 9.0.55 or later, or to version 10.0.3 or later.
Who is affected by CVE-2017-0883?
CVE-2017-0883 affects Nextcloud Server versions prior to 9.0.55 and exactly 10.0.2.
What kind of attack does CVE-2017-0883 enable?
CVE-2017-0883 enables authenticated adversaries to reshare files with increased permissions, potentially allowing them to edit files.
Is user authentication required to exploit CVE-2017-0883?
Yes, an attacker must be authenticated to exploit CVE-2017-0883 and perform unauthorized resharing of files.