CVE-2021-42642
📋 TL;DR
CVE-2021-42642 is an Insecure Direct Object Reference vulnerability in PrinterLogic Web Stack that allows unauthenticated attackers to retrieve plaintext console credentials for printers. This affects PrinterLogic Web Stack versions 19.1.1.13 SP9 and below, potentially exposing printer management systems to unauthorized access.
💻 Affected Systems
- PrinterLogic Web Stack
📦 What is this software?
Web Stack by Printerlogic
Web Stack by Printerlogic
Web Stack by Printerlogic
Web Stack by Printerlogic
Web Stack by Printerlogic
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to printer management console, potentially compromising all connected printers and network infrastructure.
Likely Case
Unauthorized access to printer management systems leading to printer configuration changes, data exfiltration, or lateral movement within the network.
If Mitigated
Limited to credential disclosure without successful authentication or lateral movement due to network segmentation.
🎯 Exploit Status
IDOR vulnerabilities typically have low exploitation complexity and can be easily automated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 19.1.1.13 SP9
Vendor Advisory: https://www.printerlogic.com/security-bulletin/
Restart Required: Yes
Instructions:
1. Download latest PrinterLogic Web Stack version from vendor portal. 2. Backup current configuration. 3. Install update following vendor documentation. 4. Restart services. 5. Verify update applied successfully.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to PrinterLogic Web Stack management interface to authorized networks only.
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="TRUSTED_NETWORK" port port="443" protocol="tcp" accept'
netsh advfirewall firewall add rule name="PrinterLogic Access" dir=in action=allow protocol=TCP localport=443 remoteip=TRUSTED_NETWORK
Credential Rotation
allChange all printer console credentials to mitigate impact of potential credential disclosure.
Use PrinterLogic admin console to change credentials for all managed printers
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted IP addresses only
- Monitor authentication logs for suspicious access attempts to printer management interfaces
🔍 How to Verify
Check if Vulnerable:
Check PrinterLogic Web Stack version in admin console or via version file in installation directory.Check Version:
Check web interface footer or review installation logs for version informationVerify Fix Applied:
Verify version is above 19.1.1.13 SP9 and test that unauthenticated access to object references returns proper authorization errors.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to printer management endpoints
- Multiple failed authentication attempts followed by successful access
- Unusual access patterns to printer configuration endpoints
Network Indicators:
- Unusual HTTP requests to printer management API endpoints from untrusted sources
- Traffic patterns suggesting credential harvesting
SIEM Query:
source="printerlogic" AND (http_status=200 OR http_status=302) AND user="-" AND uri CONTAINS "/api/printer/credentials"🔗 References
- http://printerlogic.com
- https://portswigger.net/daily-swig/printerlogic-vendor-addresses-triple-rce-threat-against-all-connected-endpoints
- https://securityaffairs.co/wordpress/127194/security/printerlogic-printer-management-suite-flaws.html
- https://thecyberthrone.in/2022/01/26/printerlogic-%F0%9F%96%A8-fixes-critical-vulnerabilities-in-its-suite/?utm_source=rss&utm_medium=rss&utm_campaign=printerlogic-%25f0%259f%2596%25a8-fixes-critical-vulnerabilities-in-its-suite
- https://www.printerlogic.com/security-bulletin/
- https://www.securityweek.com/printerlogic-patches-code-execution-flaws-printer-management-suite
- https://www.yahooinc.com/paranoids/paranoids-vulnerability-research-printerlogic-issues-security-alert/
- http://printerlogic.com
- https://portswigger.net/daily-swig/printerlogic-vendor-addresses-triple-rce-threat-against-all-connected-endpoints
- https://securityaffairs.co/wordpress/127194/security/printerlogic-printer-management-suite-flaws.html
- https://thecyberthrone.in/2022/01/26/printerlogic-%F0%9F%96%A8-fixes-critical-vulnerabilities-in-its-suite/?utm_source=rss&utm_medium=rss&utm_campaign=printerlogic-%25f0%259f%2596%25a8-fixes-critical-vulnerabilities-in-its-suite
- https://www.printerlogic.com/security-bulletin/
- https://www.securityweek.com/printerlogic-patches-code-execution-flaws-printer-management-suite
- https://www.yahooinc.com/paranoids/paranoids-vulnerability-research-printerlogic-issues-security-alert/
