#VU27603 Permissions, Privileges, and Access Controls in OpenStack Keystone - CVE-2020-12689

Vulnerability identifier: #VU27603

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-12689

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenStack Keystone
Client/Desktop applications / Other client software

Vendor: Openstack

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions, which leads to security restrictions bypass and privilege escalation. Any user authenticated within a limited scope (trust/oauth/application credential) can create an EC2 credential with an escalated permission, such as obtaining admin while the user is on a limited viewer role. 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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenStack Keystone: 8.0.0 - 2015.1.4

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External links
https://bugs.launchpad.net/keystone/+bug/1872735
https://www.openwall.com/lists/oss-security/2020/05/06/5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.