CVE-2018-9246
📋 TL;DR
This vulnerability allows remote code execution via shell injection in PGObject::Util::DBAdmin module for Perl. Attackers can execute arbitrary commands with application privileges by exploiting insufficient input sanitization in database functions. Affects LedgerSMB accounting software users running vulnerable versions.
💻 Affected Systems
- LedgerSMB
- PGObject::Util::DBAdmin
📦 What is this software?
Ledgersmb by Ledgersmb
Pgobject Util Dbadmin by Pgobject Util Dbadmin Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands as the application user, potentially leading to data theft, system takeover, or lateral movement.
Likely Case
Unauthorized database operations, data exfiltration, or installation of backdoors through command injection.
If Mitigated
Limited impact if proper input validation and least privilege principles are implemented, though risk remains elevated due to code execution capability.
🎯 Exploit Status
Exploitation requires authenticated access but the vulnerability is straightforward to exploit once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: PGObject::Util::DBAdmin 0.120.0 or later
Vendor Advisory: https://archive.ledgersmb.org/ledger-smb-announce/msg00280.html
Restart Required: Yes
Instructions:
1. Update PGObject::Util::DBAdmin to version 0.120.0 or later via CPAN. 2. Update LedgerSMB if using bundled version. 3. Restart the application service.
🔧 Temporary Workarounds
Disable vulnerable functions
allRestrict access to create(), run_file(), backup(), and restore() functions in application configuration
# Modify application configuration to disable or restrict affected database functions
Implement input validation wrapper
allAdd custom input sanitization for database function parameters
# Implement strict input validation for all parameters passed to database shell commands
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Apply principle of least privilege to application service accounts
🔍 How to Verify
Check if Vulnerable:
Check PGObject::Util::DBAdmin version: perl -MPGObject::Util::DBAdmin -e 'print $PGObject::Util::DBAdmin::VERSION'Check Version:
perl -MPGObject::Util::DBAdmin -e 'print $PGObject::Util::DBAdmin::VERSION'Verify Fix Applied:
Verify version is 0.120.0 or higher using the same command📡 Detection & Monitoring
Log Indicators:
- Unusual database administration commands in application logs
- Shell commands with unexpected parameters in system logs
Network Indicators:
- Unexpected outbound connections from application server
- Database administration traffic from unauthorized sources
SIEM Query:
source="application.log" AND ("create()" OR "run_file()" OR "backup()" OR "restore()") AND command="*;*" OR command="*|*" OR command="*`*"