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CVE-2024-56433 affects shadow-utils (shadow) versions 4.4 through 4.17.0. Its default subordinate-ID behavior assigns ranges in /etc/subuid, such as UIDs 100000 through 165535 for the first account. These ranges can overlap with UIDs assigned to users in locally administered networks. An attacker may exploit the collision through newuidmap to access an NFS home directory or same-host resources available during remote logins by affected local-network users, potentially resulting in account takeover.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides proof-of-concept (POC) exploit code for CVE-2024-56433, a vulnerability in shadow-utils (versions 4.4 to 4.17.0) affecting Linux systems. The vulnerability arises from insecure default subordinate UID/GID assignments, which can allow a local user to impersonate other users (including network users) by leveraging their delegated UID/GID ranges. The repository contains two POC implementations: 'subdo.c' (C) and 'subdo.py' (Python). Both tools allow a local user to spawn a shell or execute arbitrary commands as any UID/GID within their assigned subordinate range by creating a new user namespace and mapping the desired IDs. The exploit demonstrates how a user can access files and resources belonging to other users, such as NFS home directories or Kerberos credentials, potentially leading to unauthorized data access. The repository is structured with a detailed README.md explaining the vulnerability, impact, and usage, and two code files implementing the exploit logic. The attack vector is local privilege escalation, requiring local access and a delegated subordinate UID/GID range. No remote or network endpoints are involved, but several fingerprintable file paths are referenced, including /etc/login.defs, /etc/subuid, /etc/subgid, and system binaries used for UID/GID mapping.
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A vulnerability in shadow-utils where the default subordinate-ID configuration in /etc/login.defs could lead to system compromise.
A local, low-complexity vulnerability in shadow-utils caused by the default subordinate-ID configuration in /etc/login.defs, which could lead to compromise. It affects installed packages on Rocky Linux 10.1 covered by CIQ advisory crlsa-2025_20145.
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