CVE-2021-20182

A privilege escalation flaw was found in openshift4/ose-docker-builder. The build container runs with high privileges using a chrooted environment instead of runc. If an attacker can gain access to this build container, they can potentially utilize the raw devices of the underlying node, such as the network and storage devices, to at least escalate their privileges to that of the cluster admin. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Weakness

The product makes files or directories accessible to unauthorized actors, even though they should not be.

Affected Software

Extended Description

Web servers, FTP servers, and similar servers may store a set of files underneath a “root” directory that is accessible to the server’s users. Applications may store sensitive files underneath this root without also using access control to limit which users may request those files, if any. Alternately, an application might package multiple files or directories into an archive file (e.g., ZIP or tar), but the application might not exclude sensitive files that are underneath those directories. In cloud technologies and containers, this weakness might present itself in the form of misconfigured storage accounts that can be read or written by a public or anonymous user.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/150.html
• https://cwe.mitre.org/data/definitions/639.html

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1915110
• https://bugzilla.redhat.com/show_bug.cgi?id=1915110