Description
A container privilege escalation flaw was found in certain Multi-Cloud Object Gateway Core images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container
Problem types
Product status
Timeline
| 2025-08-08: | Reported to Red Hat. |
| 2026-03-13: | Made public. |
Credits
Red Hat would like to thank Antony Di Scala and Michael Whale for reporting this issue.
References
access.redhat.com/security/cve/CVE-2025-8766
bugzilla.redhat.com/show_bug.cgi?id=2387265 (RHBZ#2387265)