CVE-2017-17051 OpenStack Nova DoS by rebuilding the same instance with a new image multiple times

What is CVE-2017-17051?

CVE-2017-17051 is a high-severity denial of service vulnerability in n/a, published on 5 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in the default FilterScheduler in OpenStack Nova 16.0.3. By repeatedly rebuilding an instance with new images, an authenticated user may consume untracked resources on a hypervisor host leading to a denial of service, aka doubled resource allocations. This regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239); however, only Nova stable/pike or later deployments with that fix applied and relying on the default FilterScheduler are affected.

Weakness: CWE-400

Which versions are affected by CVE-2017-17051?

3 open source packages ship an affected version, including nova. It affects 1 product.

Products include Openstack Nova.

How do I fix CVE-2017-17051?

Upgrade nova to 16.0.4 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-17051 being exploited?

There is no known exploitation of CVE-2017-17051 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-7214 OpenStack Nova logs sensitive context from notification exceptions Critical 9.8
• CVE-2020-17376 OpenStack Nova Live migration fails to update persistent domain XML High 8.3
• CVE-2017-18191 OpenStack Nova Denial of service attack on the compute host High 7.5
• CVE-2015-3280 OpenStack Compute (nova) allows remote authenticated users to cause a denial of service Medium 6.8
• CVE-2015-3241 OpenStack Nova instance migration process does not stop when instance is deleted Medium 6.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-17051, GHSA-vq76-rxx3-4r4r, PYSEC-2026-692.