CVE-2026-28769: IDC SFX SuperFlex Path Traversal Flaw

CVE-2026-28769 Overview

A path traversal vulnerability exists in the /IDC_Logging/checkifdone.cgi script within the International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver Web management portal version 101. This vulnerability allows an authenticated attacker to manipulate the file parameter to traverse directories and enumerate arbitrary files on the underlying filesystem.

Critical Impact

Authenticated attackers can exploit insecure Perl file path handling to perform directory traversal and enumerate sensitive files on the satellite receiver's filesystem, potentially exposing configuration data and system information.

Affected Products

• International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver
• Web Management Portal Version 101
• /IDC_Logging/checkifdone.cgi endpoint

Discovery Timeline

• 2026-03-04 - CVE-2026-28769 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28769

Vulnerability Analysis

This vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as path traversal or directory traversal. The affected component is a CGI script written in Perl that handles logging operations within the satellite receiver's web management interface.

The vulnerability exists due to improper sanitization of user-supplied input in the file parameter. When processing backup-related requests, the application fails to adequately validate file paths before performing file system operations. This allows authenticated users to escape the intended directory structure using path traversal sequences.

The backup endpoint provides implicit confirmation of file existence through its response behavior—returning a successful status when a file exists at the traversed path, and a failed status when targeting non-existent files. This oracle behavior enables attackers to systematically enumerate the filesystem.

Root Cause

The root cause of this vulnerability lies in insecure Perl file path handling within the checkifdone.cgi script. The application accepts user input for the file parameter and passes it directly to file system functions without proper path canonicalization or validation. The absence of input sanitization to strip or block directory traversal sequences (such as ../) allows attackers to navigate outside the intended logging directory.

Attack Vector

The attack vector is network-based, requiring authenticated access to the web management portal. An attacker with valid credentials can craft malicious HTTP requests to the /IDC_Logging/checkifdone.cgi endpoint, manipulating the file parameter to include path traversal sequences. The differential response behavior (success vs. failure) allows the attacker to confirm the existence of arbitrary files on the filesystem.

The vulnerability manifests through improper handling of the file parameter in the backup endpoint. By appending directory traversal sequences to the parameter value, an authenticated attacker can reference files outside the intended directory scope. The application's response indicates whether the targeted file exists, enabling file enumeration attacks. For detailed technical analysis, see the vulnerability research by Abdul MHS.

Detection Methods for CVE-2026-28769

Indicators of Compromise

• HTTP requests to /IDC_Logging/checkifdone.cgi containing ../ sequences in the file parameter
• Unusual access patterns to the backup or logging endpoints from authenticated sessions
• Log entries showing repeated requests with varying file paths to the affected CGI script
• Attempts to access sensitive system files such as /etc/passwd or configuration files through the web interface

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal sequences in HTTP parameters
• Monitor web server access logs for requests containing encoded or unencoded directory traversal patterns targeting CGI scripts
• Configure intrusion detection systems (IDS) to alert on requests to /IDC_Logging/checkifdone.cgi with suspicious file parameter values
• Deploy SentinelOne Singularity to detect anomalous file access patterns originating from web server processes

Monitoring Recommendations

• Enable verbose logging on the satellite receiver's web management interface to capture all CGI script invocations
• Implement real-time alerting for access attempts to sensitive system files from the web server process
• Monitor authenticated user sessions for unusual patterns of requests to logging or backup endpoints
• Review access control logs for any unauthorized enumeration attempts

How to Mitigate CVE-2026-28769

Immediate Actions Required

• Restrict network access to the web management portal to trusted IP addresses and administrative networks only
• Implement additional authentication layers such as VPN requirements for accessing the management interface
• Review and audit all user accounts with access to the satellite receiver management portal
• Consider disabling the web management interface if not operationally required until a patch is available

Patch Information

At the time of publication, no vendor patch information is available for this vulnerability. Organizations should monitor International Datacasting Corporation's security advisories for updates. Additional technical details can be found in the vulnerability analysis by Abdul MHS.

Workarounds

• Implement network segmentation to isolate satellite receiver management interfaces from general network access
• Deploy a reverse proxy with path validation rules to filter malicious requests before they reach the vulnerable endpoint
• Configure access control lists (ACLs) to restrict which authenticated users can access the logging functionality
• Use application-layer firewalls to block requests containing path traversal sequences in CGI parameters

Network segmentation and access control configuration should follow your organization's security policies. Consult your network administrator to implement appropriate restrictions on management interface access.