CVE-2025-14708 Overview
A buffer overflow vulnerability has been identified in Shiguangwu sgwbox N3 running firmware version 2.0.25. This vulnerability affects the /usr/sbin/http_eshell_server component, specifically within the WIREDCFGGET Interface. An attacker can exploit this flaw by manipulating the params argument, causing a buffer overflow condition. The attack can be executed remotely over the network without requiring authentication, potentially allowing complete system compromise.
Critical Impact
Remote attackers can exploit this buffer overflow to potentially gain unauthorized access, execute arbitrary code, or cause denial of service on affected Shiguangwu sgwbox N3 devices.
Affected Products
- Shiguangwu sgwbox N3 Firmware version 2.0.25
- Shiguangwu sgwbox N3 Hardware
Discovery Timeline
- 2025-12-15 - CVE-2025-14708 published to NVD
- 2026-01-09 - Last updated in NVD database
Technical Details for CVE-2025-14708
Vulnerability Analysis
This vulnerability is classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) and CWE-120 (Buffer Copy without Checking Size of Input). The flaw resides in the http_eshell_server binary located at /usr/sbin/http_eshell_server, which handles requests to the WIREDCFGGET interface.
When processing requests, the vulnerable component fails to properly validate the length of the params argument before copying it into a fixed-size buffer. This allows an attacker to supply an oversized input that exceeds the allocated buffer space, overwriting adjacent memory regions.
The vulnerability is remotely exploitable, meaning an attacker does not need local access to the device. Additionally, no authentication or user interaction is required to trigger the overflow, making this vulnerability particularly dangerous for internet-exposed devices.
Root Cause
The root cause of this vulnerability stems from classic buffer overflow conditions where input validation is absent or insufficient. The http_eshell_server component processes the params argument from incoming network requests without verifying that the input size does not exceed the destination buffer's capacity. This allows attackers to craft malicious requests containing oversized payloads that corrupt memory.
The vulnerable code path likely uses unsafe string copy functions (such as strcpy or sprintf) that do not perform bounds checking, enabling unbounded writes to stack or heap memory regions.
Attack Vector
The attack is network-based and can be executed remotely against the WIREDCFGGET interface exposed by the http_eshell_server service. An attacker would craft a specially formatted HTTP request targeting this interface with an oversized params argument. Upon processing the malicious request, the buffer overflow is triggered, which could lead to:
- Remote code execution through control flow hijacking
- Denial of service by crashing the service or device
- Potential full device compromise depending on execution context
The exploit has been disclosed publicly, and the vendor (Shiguangwu) was contacted regarding this issue but did not respond. Additional technical details are available through the VulDB CTI entry and the Notion Buffer Overflow Analysis.
Detection Methods for CVE-2025-14708
Indicators of Compromise
- Unusual or malformed HTTP requests targeting the /usr/sbin/http_eshell_server service
- Crash logs or segmentation faults in the http_eshell_server process
- Unexpected service restarts or device reboots
- Anomalous network traffic patterns to the WIREDCFGGET interface with oversized payloads
Detection Strategies
- Implement network-based intrusion detection rules to identify HTTP requests with abnormally large params values targeting sgwbox N3 devices
- Monitor device logs for http_eshell_server crashes or error messages indicating memory corruption
- Deploy SentinelOne Singularity agents where applicable to detect exploitation attempts and memory corruption behaviors
- Use network segmentation monitoring to detect unauthorized access attempts to NAS devices
Monitoring Recommendations
- Enable verbose logging on sgwbox N3 devices if supported to capture detailed request information
- Implement real-time alerting for any detected crashes or anomalies in the http_eshell_server service
- Conduct regular traffic analysis on network segments containing affected devices
- Review firewall logs for connection attempts targeting the vulnerable interface from untrusted sources
How to Mitigate CVE-2025-14708
Immediate Actions Required
- Restrict network access to the sgwbox N3 device by implementing firewall rules that block external access to the vulnerable interface
- Isolate affected devices on a separate network segment away from critical infrastructure
- Monitor for any indicators of compromise on affected systems
- Consider disabling the http_eshell_server service if not required for operations
Patch Information
No official patch is currently available from the vendor. The vendor (Shiguangwu) was contacted regarding this vulnerability but did not respond. Organizations should implement compensating controls until an official fix is released. Monitor the VulDB entry for updates on remediation status.
Workarounds
- Block external network access to the affected device using firewall rules to allow only trusted IP addresses
- Place the sgwbox N3 device behind a reverse proxy or web application firewall (WAF) capable of filtering malicious requests
- Disable or restrict access to the WIREDCFGGET interface if it is not required for normal operations
- Implement network segmentation to limit lateral movement if a device is compromised
# Example firewall rule to restrict access to the device (adjust IP/port as needed)
# Allow only trusted management subnet
iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
