CVE-2025-9585 Overview
CVE-2025-9585 is a command injection vulnerability in the Comfast CF-N1 wireless access point running firmware version 2.6.0. The flaw resides in the wifilith_delete_pic_file function inside the /usr/bin/webmgnt binary. Attackers can manipulate the portal_delete_picname argument to inject operating system commands. The vulnerability is exploitable remotely over the network and requires only low-level authentication. Public disclosure of the exploit has occurred, increasing the likelihood of opportunistic abuse against exposed devices [CWE-74].
Critical Impact
Authenticated remote attackers can execute arbitrary operating system commands on affected Comfast CF-N1 devices through the captive portal image deletion handler.
Affected Products
- Comfast CF-N1 hardware (version 2)
- Comfast CF-N1 firmware 2.6.0
- /usr/bin/webmgnt web management binary
Discovery Timeline
- 2025-08-28 - CVE-2025-9585 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2025-9585
Vulnerability Analysis
The Comfast CF-N1 web management daemon webmgnt exposes administrative functionality for managing the device's captive portal, including the ability to delete uploaded portal images. The wifilith_delete_pic_file function processes the portal_delete_picname parameter without sanitizing shell metacharacters before passing the value into a system command. This allows an attacker to append additional commands using separators such as ;, |, or backticks. The injected commands execute with the privileges of the webmgnt process, which typically runs as root on embedded network devices.
Root Cause
The root cause is improper neutralization of special elements in command-bound input [CWE-74]. The wifilith_delete_pic_file handler concatenates user-controlled data directly into a shell command string rather than using parameterized execution or strict allowlist validation of filenames.
Attack Vector
Exploitation requires network access to the device's web management interface and low-privilege authenticated access. After authenticating, the attacker submits a crafted request to the portal image deletion endpoint with a malicious portal_delete_picname value containing shell metacharacters. The injected payload executes on the underlying Linux system. Technical details and proof-of-concept materials are documented in the GitHub Project Documentation and VulDB #321698.
Detection Methods for CVE-2025-9585
Indicators of Compromise
- HTTP requests to the webmgnt interface containing shell metacharacters (;, |, &, backticks, $()) in the portal_delete_picname parameter
- Unexpected outbound connections originating from the CF-N1 device to attacker-controlled hosts
- New or modified files in writable filesystem locations on the access point following portal image deletion requests
Detection Strategies
- Inspect HTTP/HTTPS traffic destined for the CF-N1 management interface and alert on non-alphanumeric characters within filename parameters
- Correlate authentication events on the device with subsequent portal management API calls to identify abnormal sequences
- Monitor DNS queries and outbound traffic from network infrastructure subnets where Comfast access points reside
Monitoring Recommendations
- Forward syslog and web management logs from CF-N1 devices to a centralized logging or SIEM platform for retention and analysis
- Baseline normal administrative activity against the portal management endpoints and alert on deviations
- Restrict and audit management plane access using network segmentation and source IP allowlists
How to Mitigate CVE-2025-9585
Immediate Actions Required
- Remove the CF-N1 management interface from any internet-exposed network and place it on a dedicated management VLAN
- Rotate administrative credentials on all CF-N1 devices and enforce strong, unique passwords
- Review device logs for evidence of exploitation attempts targeting portal_delete_picname
Patch Information
No vendor advisory or firmware patch from Comfast is referenced in the published CVE data. Operators should monitor the Comfast support channels for an updated firmware release that supersedes version 2.6.0 and addresses wifilith_delete_pic_file.
Workarounds
- Disable the captive portal feature if it is not required, eliminating use of the vulnerable image management endpoints
- Block external access to the webmgnt HTTP service using upstream firewall rules
- Replace affected CF-N1 devices with supported hardware where business requirements demand internet-facing management
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
