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Security Bulletin: Potential Nova denial of service through compressed disk images (CVE-2013-4463, CVE-2013-4469)

Security Bulletin


Summary

By using malicious compressed qcow2 disk images, an authenticated user might consume large amounts of disk space for each image. This scenario can potentially result in a Denial of Service attack on Nova compute nodes (CVE-2013-4463). In the non-default case where use_cow_images=False and malicious qcow images are transferred from Glance, an authenticated user might still consume large amounts of disk space for each instance using the malicious image. This scenario also potentially results in a Denial of Service attack on Nova compute nodes (CVE-2013-4469).

Vulnerability Details

CVE ID: CVE-2013-4463
DESCRIPTION:
OpenStack Compute (Nova) is vulnerable to a denial of service, which is caused by an error that is related to the control of the size of disk images. A remote authenticated attacker might exploit this vulnerability using malicious compressed qcow2 disk images to consume an overly large amount of disk space.

CVSS:
CVSS Base Score: 4.0
CVSS Temporal Score See https://exchange.xforce.ibmcloud.com/vulnerabilities/88486 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P)


CVE ID: CVE-2013-4469

DESCRIPTION:
OpenStack Compute (Nova) is vulnerable to a denial of service, which is caused by an incomplete fix that is related to the way malicious qcow images are transferred from Glance. A remote authenticated attacker might exploit this vulnerability using malicious compressed qcow2 disk images to consume an overly large amount of disk space.

CVSS:
CVSS Base Score: 4.0
CVSS Temporal Score See https://exchange.xforce.ibmcloud.com/vulnerabilities/88487 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:P)

Affected Products and Versions

IBM SmartCloud Orchestrator V2.2 and 2.3

Remediation/Fixes

The recommended solution is to apply IBM SmartCloud Orchestrator V2.3.0 Fix Pack 1 as soon as practical.

Workarounds and Mitigations

The exposure applies only to KVM regions.

Ensure that IBM SmartCloud Orchestrator end users do not have access to the compute nodes.

Get Notified about Future Security Bulletins

References

Complete CVSS v2 Guide
On-line Calculator v2

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

None

Change History

March 31st 2014 Original Copy Published

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document information

More support for: IBM Cloud Orchestrator
Security

Software version: 2.2, 2.2.0.1, 2.3

Operating system(s): Linux

Reference #: 1667331

Modified date: 12 February 2015