CVE-2021-42640
📋 TL;DR
CVE-2021-42640 is an Insecure Direct Object Reference (IDOR) vulnerability in PrinterLogic Web Stack that allows unauthenticated attackers to reassign drivers for any printer. This affects PrinterLogic Web Stack versions 19.1.1.13 SP9 and below, potentially enabling attackers to disrupt printing operations or deploy malicious drivers.
💻 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 could deploy malicious printer drivers across the entire organization, leading to system compromise, data exfiltration, or ransomware deployment through driver-level access.
Likely Case
Printing service disruption, unauthorized printer configuration changes, and potential driver manipulation leading to denial of service.
If Mitigated
Limited to printing service disruption if network segmentation and access controls prevent lateral movement from compromised print servers.
🎯 Exploit Status
IDOR vulnerabilities typically require minimal technical skill to exploit once the endpoint is identified. No authentication required.
🛠️ 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 update from vendor portal. 2. Backup current configuration. 3. Apply update following vendor instructions. 4. Restart Web Stack services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to PrinterLogic Web Stack management interface to authorized IP addresses only.
# Configure firewall rules to restrict access to PrinterLogic Web Stack ports (typically 80/443)
Authentication Enforcement
allImplement additional authentication layer before Web Stack access if possible.
# Configure reverse proxy with additional authentication
# Implement IP-based access controls
🧯 If You Can't Patch
- Isolate PrinterLogic Web Stack server from internet and restrict internal access to management VLAN only.
- Implement network monitoring for unusual printer driver modification requests and alert on suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check PrinterLogic Web Stack version in administration console or via version file in installation directory.Check Version:
Check administration console or review installation directory for version information.Verify Fix Applied:
Verify version is above 19.1.1.13 SP9 and test that unauthenticated driver reassignment requests are properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated POST/PUT requests to printer driver assignment endpoints
- Multiple driver reassignment requests from single IP
- Failed authentication attempts followed by successful driver modifications
Network Indicators:
- Unusual traffic patterns to /api/printer/driver endpoints from unauthorized sources
- HTTP 200 responses to driver modification requests without authentication headers
SIEM Query:
source="printerlogic_web" AND (uri_path="/api/printer/*/driver" OR uri_path="/api/driver/assign") AND http_status=200 AND NOT auth_success=true🔗 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/
