CVE-2020-12692 OpenStack Keystone does not check signature TTL of the EC2 credential auth method

What is CVE-2020-12692?

CVE-2020-12692 is a medium-severity authentication bypass 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. The EC2 API doesn't have a signature TTL check for AWS Signature V4. An attacker can sniff the Authorization header, and then use it to reissue an OpenStack token an unlimited number of times.

Weakness: CWE-347, CWE-294

Which versions are affected by CVE-2020-12692?

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-2020-12692?

Upgrade keystone to a fixed version for your release line: 15.0.1 or 16.0.0.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-12692 being exploited?

There is no known exploitation of CVE-2020-12692 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-2020-12692, GHSA-rqw2-hhrf-7936, PYSEC-2020-56, UBUNTU-CVE-2020-12692.