Due to not properly checking the ownership of a single contact, an authenticated attacker is able to download contacts of other users in all ownCloud versions prior to 5.0.5 including the 4.5.x branch.
Note: Successful exploitation of this privilege escalation requires the “contacts” app to be enabled (enabled by default).
It is recommended that all instances are upgraded to ownCloud Server 5.0.5 or 4.5.10.
The ownCloud team thanks the following people for their research and responsible disclosure of the above advisory:
CPE | Name | Operator | Version |
---|---|---|---|
owncloud server | lt | 4.5.10 | |
owncloud server | lt | 5.0.5 |