CVE-2024-56433: shadow-utils (aka shadow) 4.4 through 4.17.0 establishes a default /etc/subuid behavior (e.g., uid 100000 through 165535 for the first user...
Description
shadow-utils (aka shadow) 4.4 through 4.17.0 establishes a default /etc/subuid behavior (e.g., uid 100000 through 165535 for the first user account) that can realistically conflict with the uids of users defined on locally administered networks, potentially leading to account takeover, e.g., by leveraging newuidmap for access to an NFS home directory (or same-host resources in the case of remote logins by these local network users). NOTE: it may also be argued that system administrators should not have assigned uids, within local networks, that are within the range that can occur in /etc/subuid.
Classification
CVE ID: CVE-2024-56433
CVSS Base Severity: LOW
CVSS Base Score: 3.6
Affected Products
Vendor: shadow-maint
Product: shadow-utils
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 17.88% (scored less or equal to compared to others)
EPSS Date: 2025-02-04 (when was this score calculated)
References
https://github.com/shadow-maint/shadow/issues/1157https://github.com/shadow-maint/shadow/blob/e2512d5741d4a44bdd81a8c2d0029b6222728cf0/etc/login.defs#L238-L241
https://github.com/shadow-maint/shadow/releases/tag/4.4