CVE-2023-25355
📋 TL;DR
CVE-2023-25355 is an insecure permissions vulnerability in CoreDial sipXcom that allows privilege escalation. Users with daemon-level command execution can overwrite service files to gain root access. This affects sipXcom servers up to version 21.04.
💻 Affected Systems
- CoreDial sipXcom
📦 What is this software?
Sipxcom by Coredial
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root access, allowing installation of persistent backdoors, data theft, and lateral movement across the network.
Likely Case
Privilege escalation from daemon to root by authenticated users, leading to unauthorized administrative control of the sipXcom server.
If Mitigated
Limited impact if proper access controls prevent unauthorized users from running commands as the daemon user.
🎯 Exploit Status
Exploitation requires existing daemon user access. The vulnerability is straightforward to exploit once daemon access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 21.04
Vendor Advisory: https://seclists.org/fulldisclosure/2023/Mar/5
Restart Required: Yes
Instructions:
1. Upgrade sipXcom to version newer than 21.04. 2. Apply vendor-provided patches if available. 3. Restart affected services.
🔧 Temporary Workarounds
Restrict daemon user permissions
linuxLimit the daemon user's ability to modify service files and critical system components.
chmod 644 /etc/systemd/system/sipxcom*.service
chown root:root /etc/systemd/system/sipxcom*.service
Implement strict access controls
linuxEnsure only authorized administrators can execute commands as the daemon user.
visudo -f /etc/sudoers.d/sipxcom-restrictions
🧯 If You Can't Patch
- Implement strict least-privilege access controls to prevent unauthorized users from gaining daemon-level access.
- Monitor and audit all commands executed as the daemon user and file modifications to service files.
🔍 How to Verify
Check if Vulnerable:
Check sipXcom version: dpkg -l | grep sipxcom or rpm -qa | grep sipxcom. If version is 21.04 or earlier, system is vulnerable.Check Version:
dpkg -l | grep sipxcom || rpm -qa | grep sipxcom || find /opt/sipxcom -name '*.jar' -exec grep -l '21.04' {} \;Verify Fix Applied:
Verify version is newer than 21.04 and check service file permissions: ls -la /etc/systemd/system/sipxcom*.service📡 Detection & Monitoring
Log Indicators:
- Unauthorized modifications to /etc/systemd/system/sipxcom*.service files
- Commands executed as daemon user modifying system files
- Privilege escalation attempts in system logs
Network Indicators:
- Unusual administrative access patterns to sipXcom servers
- Unexpected service restarts or configuration changes
SIEM Query:
source="systemd" AND (file.path="/etc/systemd/system/sipxcom*.service" AND action="modified") OR (user="daemon" AND process="chmod" OR process="chown")