CVE-2023-1329

9.8 CRITICAL

📋 TL;DR

A buffer overflow vulnerability in HP multifunction printers running HP Workpath solutions could allow remote attackers to execute arbitrary code. This affects certain HP MFP models with HP Workpath enabled. Organizations using vulnerable HP printers are at risk.

💻 Affected Systems

Products:
  • HP LaserJet Pro MFP M4301
  • HP LaserJet Pro MFP M4302
  • HP LaserJet Pro MFP M4303
  • HP LaserJet Pro MFP M4304
  • HP LaserJet Managed MFP E73050
  • HP LaserJet Managed MFP E73060
  • HP LaserJet Managed MFP E73070
Versions: Firmware versions prior to 2023.04.17
Operating Systems: Embedded printer firmware
Default Config Vulnerable: ✅ No
Notes: Only vulnerable when HP Workpath solutions are installed and enabled on affected printers.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote unauthenticated attacker gains full system control of the printer, potentially pivoting to internal networks or deploying ransomware.

🟠

Likely Case

Attacker exploits the vulnerability to disrupt printing services, steal printed documents, or use the printer as a foothold for further attacks.

🟢

If Mitigated

With proper network segmentation and HP Workpath disabled, impact is limited to denial of service if exploited.

🌐 Internet-Facing: HIGH - Printers exposed to the internet with HP Workpath enabled are directly exploitable.
🏢 Internal Only: MEDIUM - Internal attackers or malware could exploit this to move laterally within networks.

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Buffer overflow vulnerabilities with CVSS 9.8 scores typically have straightforward exploitation paths once details are known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware version 2023.04.17 or later

Vendor Advisory: https://support.hp.com/us-en/document/ish_8585737-8585769-16/hpsbpi03849

Restart Required: Yes

Instructions:

1. Access printer web interface. 2. Navigate to Settings > System > Updates. 3. Check for firmware updates. 4. Download and install firmware version 2023.04.17 or later. 5. Reboot printer after installation.

🔧 Temporary Workarounds

Disable HP Workpath

all

Remove the vulnerable attack surface by disabling HP Workpath solutions

Access printer web interface > Settings > Security > HP Workpath > Disable

Network segmentation

all

Isolate printers from critical networks and internet access

Configure firewall rules to restrict printer network access to necessary ports only

🧯 If You Can't Patch

  • Disable HP Workpath immediately on all affected printers
  • Implement strict network access controls to isolate printers from untrusted networks

🔍 How to Verify

Check if Vulnerable:

Check printer firmware version in web interface (Settings > System > Information) and verify HP Workpath is enabled

Check Version:

Not applicable - check via printer web interface or physical display

Verify Fix Applied:

Confirm firmware version is 2023.04.17 or later and HP Workpath remains disabled if not needed

📡 Detection & Monitoring

Log Indicators:

  • Unusual network traffic to printer on non-standard ports
  • Multiple failed authentication attempts to printer management interface
  • Unexpected firmware modification attempts

Network Indicators:

  • Exploit traffic patterns targeting printer buffer overflow vulnerabilities
  • Unusual outbound connections from printers

SIEM Query:

source="printer_logs" AND (event_type="firmware_change" OR event_type="authentication_failure")

🔗 References

📤 Share & Export