CVE-2024-48871: Stack-Based Buffer Overflow Vulnerability

CVE-2024-48871 Overview

CVE-2024-48871 is a critical stack-based buffer overflow vulnerability affecting Planet Technology industrial network equipment. The affected product is vulnerable to a stack-based buffer overflow where an unauthenticated attacker could send a malicious HTTP request that the webserver fails to properly check input size before copying data to the stack, potentially allowing remote code execution.

Critical Impact

This vulnerability allows unauthenticated remote attackers to potentially execute arbitrary code on affected industrial network devices through specially crafted HTTP requests, posing significant risk to ICS/SCADA environments.

Affected Products

• Planet Technology Industrial Network Equipment (refer to CISA ICS Advisory ICSA-24-340-02 for specific models)
• Firmware versions prior to v1.305b241111
• Web management interface components

Discovery Timeline

• 2024-12-06 - CVE-2024-48871 published to NVD
• 2024-12-06 - Last updated in NVD database

Technical Details for CVE-2024-48871

Vulnerability Analysis

This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow). The flaw exists within the webserver component of the affected Planet Technology industrial networking equipment. When processing HTTP requests, the webserver fails to properly validate the size of user-supplied input before copying it to a fixed-size stack buffer.

The network-accessible attack vector makes this vulnerability particularly dangerous in industrial control system (ICS) environments where these devices may be deployed. An attacker does not require any authentication or user interaction to exploit this flaw, making it an attractive target for opportunistic and targeted attacks against critical infrastructure.

Root Cause

The root cause of CVE-2024-48871 is improper input validation in the HTTP request handler. The webserver component does not adequately verify the length of incoming data before performing memory copy operations to stack-allocated buffers. This classic buffer overflow pattern allows attackers to overwrite adjacent stack memory, including return addresses, potentially gaining control of program execution flow.

Attack Vector

The vulnerability is exploited via the network through malicious HTTP requests sent to the device's web management interface. An attacker can craft an HTTP request containing oversized data in specific fields that the webserver processes without proper bounds checking. When this data is copied to the stack buffer, it overflows beyond the allocated space, corrupting adjacent memory regions.

The attack requires no authentication and no user interaction. The attacker simply needs network access to the device's HTTP service, which is commonly exposed on port 80 or 443 for device management purposes.

Since no verified code examples are available, readers should refer to the CISA ICS Advisory ICSA-24-340-02 for detailed technical information about the vulnerability mechanics and affected components.

Detection Methods for CVE-2024-48871

Indicators of Compromise

• Unusual HTTP requests with abnormally large header values or POST data targeting the device's web interface
• Unexpected device reboots or crashes that may indicate exploitation attempts
• Anomalous outbound network connections from industrial network equipment
• Web server logs showing malformed or oversized HTTP requests

Detection Strategies

• Deploy network intrusion detection systems (IDS) with signatures for HTTP-based buffer overflow attacks
• Monitor HTTP traffic to industrial network devices for requests exceeding normal size thresholds
• Implement deep packet inspection for web traffic destined to Planet Technology devices
• Enable and centralize logging from affected devices to detect exploitation attempts

Monitoring Recommendations

• Continuously monitor network traffic to and from affected industrial network equipment
• Set up alerts for HTTP requests with unusually large content lengths or header values
• Implement network segmentation monitoring to detect lateral movement following potential compromise
• Establish baseline behavior for web management interface access patterns

How to Mitigate CVE-2024-48871

Immediate Actions Required

• Update affected Planet Technology devices to firmware version v1.305b241111 or later immediately
• Restrict network access to the web management interface using firewall rules and access control lists
• Isolate affected devices behind properly configured network segmentation
• Disable the web management interface if not required for operations

Patch Information

Planet Technology has released firmware version v1.305b241111 to address this vulnerability. The updated firmware can be obtained from the Planet Support Download Page. Organizations should prioritize patching affected devices, especially those exposed to untrusted networks or the internet.

Workarounds

• Implement strict network access controls to limit which hosts can reach the device's web interface
• Use VPN or jump hosts for remote management access instead of direct HTTP exposure
• Deploy a web application firewall (WAF) in front of affected devices to filter malicious requests
• Consider disabling the HTTP management interface entirely and using alternative management methods if available

# Network segmentation example - restrict access to management interface
# Example iptables rules to limit access to device web interface
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP