CVE-2024-42400 – Multiple unauthenticated Denial-of-Service vuln... (How to Fix)

Q: What is the severity of CVE-2024-42400?

CVE-2024-42400 has a CVSS score of 5.3 (MEDIUM). Multiple unauthenticated Denial-of-Service vulnerabilities exist in the Soft AP daemon accessed via the PAPI protocol. Successful exploitation allows attackers to disrupt normal Access Point operations without authentication. This affects systems running vulnerable versions of the Soft AP daemon.

📋 TL;DR

Multiple unauthenticated Denial-of-Service vulnerabilities exist in the Soft AP daemon accessed via the PAPI protocol. Successful exploitation allows attackers to disrupt normal Access Point operations without authentication. This affects systems running vulnerable versions of the Soft AP daemon.

💻 Affected Systems

Products:

HPE Aruba Networking Access Points with Soft AP daemon

Versions: Specific versions not detailed in reference; check HPE advisory for affected versions

Operating Systems: ArubaOS

Default Config Vulnerable: ⚠️ Yes

Notes: Affects systems with Soft AP daemon enabled and accessible via PAPI protocol

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete service disruption of the Access Point, rendering network services unavailable until manual intervention or reboot.

🟠

Likely Case

Temporary service interruption causing network connectivity loss for connected devices.

🟢

If Mitigated

Minimal impact with proper network segmentation and access controls limiting exposure.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Unauthenticated access via PAPI protocol makes exploitation straightforward

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check HPE advisory for specific patched versions

Vendor Advisory: https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw04678en_us&docLocale=en_US

Restart Required: Yes

Instructions:

1. Review HPE advisory for affected versions. 2. Download and apply recommended firmware update. 3. Restart affected Access Points. 4. Verify patch application.

🔧 Temporary Workarounds

Network Segmentation

all

Restrict network access to PAPI protocol from untrusted networks

Access Control Lists

all

Implement ACLs to limit which IP addresses can communicate with Soft AP daemon

🧯 If You Can't Patch

Implement strict network segmentation to isolate affected Access Points
Deploy intrusion detection/prevention systems to monitor for DoS attempts

🔍 How to Verify

Check if Vulnerable:

Check firmware version against HPE advisory and verify Soft AP daemon is running

Check Version:

show version (ArubaOS command)

Verify Fix Applied:

Confirm firmware version is updated to patched version and test PAPI protocol connectivity

📡 Detection & Monitoring

Log Indicators:

Unusual PAPI protocol traffic patterns
Soft AP daemon crash/restart logs
High volume of connection attempts to PAPI port

Network Indicators:

Abnormal traffic to PAPI protocol port
DoS attack patterns targeting Access Points

SIEM Query:

source="access_point" AND (event="daemon_crash" OR protocol="PAPI") AND volume>threshold

📊 Metadata

CVE ID: CVE-2024-42400

CVSS v3 Score: 5.3 (MEDIUM)

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

Published: August 6, 2024

Last Updated: August 23, 2024

🔗 References

https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw04678en_us&docLocale=en_US Vendor Advisory

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