CVE-2019-13551 – This critical path traversal vulnerability in A... (How to Fix)

Q: What is the severity of CVE-2019-13551?

CVE-2019-13551 has a CVSS score of 9.8 (CRITICAL). This critical path traversal vulnerability in Advantech WISE-PaaS/RMM allows attackers to bypass directory restrictions and access arbitrary files or execute code remotely by manipulating file paths. Systems running WISE-PaaS/RMM version 3.3.29 or earlier are affected, particularly those exposed to untrusted networks.

📋 TL;DR

This critical path traversal vulnerability in Advantech WISE-PaaS/RMM allows attackers to bypass directory restrictions and access arbitrary files or execute code remotely by manipulating file paths. Systems running WISE-PaaS/RMM version 3.3.29 or earlier are affected, particularly those exposed to untrusted networks.

💻 Affected Systems

Products:

Advantech WISE-PaaS/RMM

Versions: 3.3.29 and prior

Operating Systems: All supported platforms

Default Config Vulnerable: ⚠️ Yes

Notes: Default installations are vulnerable; no special configuration required for exploitation.

📦 What is this software?

Wise Paas\/rmm by Advantech

View all CVEs affecting Wise Paas\/rmm →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution with administrator privileges leading to complete system compromise, data exfiltration, and lateral movement within the network.

🟠

Likely Case

Unauthorized file access, configuration file manipulation, and potential privilege escalation leading to system control.

🟢

If Mitigated

Limited impact with proper network segmentation, file system permissions, and input validation controls in place.

🌐 Internet-Facing: HIGH - Directly exploitable over network without authentication in default configurations.

🏢 Internal Only: HIGH - Even internally, attackers with network access can exploit this vulnerability to gain elevated privileges.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: CONFIRMED

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Multiple ZDI advisories confirm weaponization; exploitation requires minimal technical skill due to lack of authentication requirements.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Version 3.3.30 or later

Vendor Advisory: https://www.advantech.com/support

Restart Required: Yes

Instructions:

1. Download latest version from Advantech support portal. 2. Backup current configuration. 3. Install update following vendor documentation. 4. Restart services. 5. Verify patch application.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate WISE-PaaS/RMM systems from untrusted networks and internet exposure

Input Validation Rules

all

Implement web application firewall rules to block path traversal patterns

WAF rule: deny requests containing '../' or similar traversal sequences

🧯 If You Can't Patch

Implement strict network access controls to limit exposure to trusted IPs only
Deploy application-level monitoring for path traversal attempts and file access anomalies

🔍 How to Verify

Check if Vulnerable:

Check WISE-PaaS/RMM version via admin interface or configuration files; versions ≤3.3.29 are vulnerable

Check Version:

Check web interface or configuration files for version information

Verify Fix Applied:

Verify version is ≥3.3.30 and test path traversal attempts return proper error responses

📡 Detection & Monitoring

Log Indicators:

HTTP requests containing '../' sequences
Unauthorized file access attempts
Unusual file operations in system logs

Network Indicators:

HTTP requests with encoded traversal patterns (%2e%2e%2f)
Multiple failed file access attempts from single source

SIEM Query:

source="web_logs" AND (uri="*../*" OR uri="*..%2f*" OR uri="*%2e%2e%2f*")

📊 Metadata

CVE ID: CVE-2019-13551

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-22

Published: October 31, 2019

Last Updated: November 21, 2024

🔗 References

https://www.us-cert.gov/ics/advisories/icsa-19-304-01 Mitigation,Third Party Advisory,US Government Resource
https://www.zerodayinitiative.com/advisories/ZDI-19-935/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-941/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-950/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-958/ Third Party Advisory
https://www.us-cert.gov/ics/advisories/icsa-19-304-01 Mitigation,Third Party Advisory,US Government Resource
https://www.zerodayinitiative.com/advisories/ZDI-19-935/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-941/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-950/ Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-19-958/ Third Party Advisory

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🔗 Related Vulnerabilities

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