Bug 2334165 (CVE-2024-56433)

Summary: CVE-2024-56433 shadow-utils: Default subordinate ID configuration in /etc/login.defs could lead to compromise
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in shadow-utils. Affected versions of shadow-utils establish a default /etc/subuid behavior, for example, uid 100000 through 165535 for the first user account, that can conflict with the uids of users defined on locally administered networks. This issue potentially leads to account takeover by leveraging newuidmap for access to an NFS home directory or same-host resources for remote logins by these local network users.
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Bug Depends On: 2334168, 2334169    
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Description OSIDB Bzimport 2024-12-26 09:01:18 UTC 
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.