ESA-03: Walrus Authentication Bypass Vulnerability

Eucalyptus Security Advisory
Advisory ID: 
Severity Level: 
Issue Date: 
Last Updated: 
Affected Products: 
Eucalyptus 2.0.3, 3.0.1 and earlier


A security vulnerability has been identified in Eucalyptus 3.0.1 and earlier. An update is now available that resolves this issue. We advise immediately updating all affected Eucalyptus installations following the instructions below.


Walrus is a storage service included with Eucalyptus. It allows users to store and access persistent data organized as buckets and objects. A flaw was found in the way Walrus performs authentication of users. An attacker could submit a specially-crafted REST request to the Walrus public interface that would allow the attacker to authenticate as a Eucalyptus admin user and potentially gain full access to objects stored on Walrus.


Eucalyptus versions 3.0.2 and 3.1.0 resolve this issue.

Please see for instructions on downloading and upgrading to the latest Eucalyptus software.

Contact and Help

Contact the Eucalyptus Security Team at