CVE-2022-21176 – This SQL injection vulnerability in Cambium Net... (How to Fix)

Q: What is the severity of CVE-2022-21176?

CVE-2022-21176 has a CVSS score of 8.6 (HIGH). This SQL injection vulnerability in Cambium Networks wireless devices allows attackers to execute arbitrary SQL commands through unsanitized user input. Affected organizations using MMP, PTP C-series, or PTMP C-series/A5x devices prior to patched versions may have sensitive information exposed.

📋 TL;DR

This SQL injection vulnerability in Cambium Networks wireless devices allows attackers to execute arbitrary SQL commands through unsanitized user input. Affected organizations using MMP, PTP C-series, or PTMP C-series/A5x devices prior to patched versions may have sensitive information exposed.

💻 Affected Systems

Products:

Cambium Networks MMP
Cambium Networks PTP C-series
Cambium Networks PTMP C-series
Cambium Networks A5x

Versions: MMP: All versions prior to v1.0.3, PTP C-series: Device versions prior to v2.8.6.1, PTMP C-series and A5x: Device versions prior to v2.5.4.1

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: Affects web management interface of these wireless devices. No special configuration required for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of device configuration, extraction of all stored credentials and network information, and potential lateral movement to connected systems.

🟠

Likely Case

Unauthorized access to device configuration data, exposure of network credentials, and potential device takeover.

🟢

If Mitigated

Limited to attempted exploitation attempts that are blocked by input validation or network segmentation.

🌐 Internet-Facing: HIGH - Wireless access points are often internet-facing and directly accessible to attackers.

🏢 Internal Only: MEDIUM - Internal attackers could exploit this if they have network access to management interfaces.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

SQL injection vulnerabilities typically have low exploitation complexity. The advisory suggests unauthenticated access is possible.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: MMP: v1.0.3, PTP C-series: v2.8.6.1, PTMP C-series and A5x: v2.5.4.1

Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-22-034-02

Restart Required: Yes

Instructions:

1. Download latest firmware from Cambium support portal. 2. Backup current configuration. 3. Upload firmware via web interface. 4. Apply firmware update. 5. Restart device. 6. Verify version after reboot.

🔧 Temporary Workarounds

Network Segmentation

all

Restrict access to device management interfaces to authorized administrative networks only.

Configure firewall rules to block external access to device management ports (typically 80/443)

Input Validation Proxy

all

Deploy a web application firewall or reverse proxy to filter SQL injection attempts.

Configure WAF rules to block SQL injection patterns in HTTP requests

🧯 If You Can't Patch

Isolate affected devices in separate VLAN with strict access controls
Disable remote management and require physical console access for administration

🔍 How to Verify

Check if Vulnerable:

Check device firmware version via web interface: System > Status > Software Version

Check Version:

Web interface navigation or SSH command varies by device model

Verify Fix Applied:

Confirm version matches patched versions: MMP v1.0.3+, PTP C-series v2.8.6.1+, PTMP C-series/A5x v2.5.4.1+

📡 Detection & Monitoring

Log Indicators:

Unusual SQL error messages in device logs
Multiple failed login attempts with SQL syntax
Unexpected configuration changes

Network Indicators:

HTTP requests containing SQL keywords to management interface
Unusual outbound connections from device

SIEM Query:

source="cambium_device" AND (http_uri="*SELECT*" OR http_uri="*UNION*" OR http_uri="*INSERT*" OR http_uri="*DELETE*")

📊 Metadata

CVE ID: CVE-2022-21176

CVSS v3 Score: 8.6 (HIGH)

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

CWE: CWE-89

Published: February 18, 2022

Last Updated: November 21, 2024

🔗 References

https://www.cisa.gov/uscert/ics/advisories/icsa-22-034-02 Third Party Advisory,US Government Resource
https://www.cisa.gov/uscert/ics/advisories/icsa-22-034-02 Third Party Advisory,US Government Resource

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