CVE-2022-48311
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in HP Deskjet 2540 series printers that allows authenticated attackers to inject malicious scripts via the HTTP configuration page. The vulnerability affects printers with firmware version CEP1FN1418BR and product model A9U23B. Note that these products are no longer supported by HP.
💻 Affected Systems
- HP Deskjet 2540 series printers
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could execute arbitrary JavaScript in the printer's web interface, potentially stealing session cookies, performing actions as the authenticated user, or redirecting to malicious sites.
Likely Case
An attacker with access to the printer's web interface could inject scripts that steal credentials or perform unauthorized configuration changes.
If Mitigated
With proper network segmentation and access controls, the impact is limited to the printer's web interface only.
🎯 Exploit Status
Exploitation requires authentication to the printer's web interface. Public proof-of-concept code is available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch is available as these products are no longer supported by HP.
🔧 Temporary Workarounds
Disable HTTP configuration interface
allDisable the web interface if not required for operations
Access printer settings via physical interface or other management methods
Network segmentation
allIsolate printer on separate VLAN with restricted access
Configure network switches/routers to place printer on isolated VLAN
🧯 If You Can't Patch
- Replace affected printers with supported models
- Implement strict access controls to printer management interface
🔍 How to Verify
Check if Vulnerable:
Check printer firmware version via web interface or physical display. If firmware is CEP1FN1418BR and model is A9U23B, it is vulnerable.Check Version:
Access printer web interface at http://[printer-ip] and check firmware version in settingsVerify Fix Applied:
Since no patch is available, verification involves implementing workarounds and testing that web interface is no longer accessible or properly segmented.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to printer configuration pages
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP traffic to printer web interface containing script tags or JavaScript payloads
SIEM Query:
source_ip="printer_ip" AND (http_method="POST" AND uri CONTAINS "/hp/device/") AND (http_user_agent CONTAINS "script" OR http_content CONTAINS "<script>")