Improper privilege management in ownCloud Server - #VU19532

Vulnerability details

The vulnerability allows a remote attacker to gain elevated privileges.

The vulnerability exists due to the possibility to extend internal-share permissions using the API. A remote attacker can extend the permission of a received subfolder share using the ocs api and gain elevated privileges. Additional risk exists because the privileged extension is also possible on public-shares.

Affected software

Remediation

External References

• https://owncloud.org/security/advisories/possibility-to-extend-internal-share-permissions-using-the-api/
• https://github.com/owncloud/core/commit/c93eca49c32428ece03dd67042772d5fa62c8d6e

Related Security Bulletins

• Privilege escalation in ownCloud