CVE-2017-8837
📋 TL;DR
This vulnerability allows attackers to read cleartext passwords stored in /etc/waipass and /etc/roapass files on vulnerable Peplink Balance devices. If compromised, attackers can steal credentials and pivot to other systems. Affects Peplink Balance 305, 380, 580, 710, 1350, and 2500 devices with outdated firmware.
💻 Affected Systems
- Peplink Balance 305
- Peplink Balance 380
- Peplink Balance 580
- Peplink Balance 710
- Peplink Balance 1350
- Peplink Balance 2500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full network compromise through credential theft, lateral movement to other systems, and potential data exfiltration.
Likely Case
Credential theft leading to unauthorized access to network resources and potential privilege escalation.
If Mitigated
Limited impact with proper network segmentation and access controls preventing lateral movement.
🎯 Exploit Status
Exploit requires local access to device filesystem, but public exploit code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: fw-b305hw2_380hw6_580hw2_710hw3_1350hw2_2500-7.0.1-build2093 or later
Vendor Advisory: https://forum.peplink.com/t/security-advisory-cve-2017-8837/
Restart Required: Yes
Instructions:
1. Log into Peplink web interface. 2. Navigate to System > Firmware. 3. Upload and install firmware version 7.0.1-build2093 or later. 4. Reboot device.
🔧 Temporary Workarounds
Remove password files
linuxDelete the vulnerable password files to prevent credential exposure
rm /etc/waipass
rm /etc/roapass
Restrict file permissions
linuxChange file permissions to prevent unauthorized reading
chmod 600 /etc/waipass
chmod 600 /etc/roapass
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Monitor for unauthorized access attempts and file access to sensitive paths
🔍 How to Verify
Check if Vulnerable:
Check if /etc/waipass or /etc/roapass files exist and contain cleartext passwordsCheck Version:
cat /etc/versionVerify Fix Applied:
Verify firmware version is 7.0.1-build2093 or later and password files are encrypted or removed📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to /etc/waipass or /etc/roapass files
- Failed authentication attempts followed by successful access
Network Indicators:
- Unusual outbound connections from Peplink devices
- Credential harvesting patterns
SIEM Query:
source="peplink" AND (file_path="/etc/waipass" OR file_path="/etc/roapass")