CVE-2020-12691 OpenStack Keystone V3 /credentials endpoint policy logic allows to change credentials owner or target project ID

What is CVE-2020-12691?

CVE-2020-12691 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 6 May 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any authenticated user can create an EC2 credential for themselves for a project that they have a specified role on, and then perform an update to the credential user and project, allowing them to masquerade as another user. This potentially allows a malicious user to act as the admin on a project another user has the admin role on, which can effectively grant that user global admin privileges.

Weakness: CWE-863

Which versions are affected by CVE-2020-12691?

5 open source packages ship an affected version, including keystone. It affects 2 products.

Products include Canonical Ubuntu Linux, Openstack Keystone.

How do I fix CVE-2020-12691?

Upgrade keystone to a fixed version for your release line: 15.0.1 or 16.0.1.

Is CVE-2020-12691 being exploited?

There is no known exploitation of CVE-2020-12691 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2020-12691, GHSA-4427-7f3w-mqv6, PYSEC-2020-55, UBUNTU-CVE-2020-12691.