CVE-2018-25311: VideoFlow DVP Path Traversal Vulnerability

CVE-2018-25311 Overview

CVE-2018-25311 is an authenticated directory traversal vulnerability affecting VideoFlow Digital Video Protection DVP 2.10. This vulnerability allows authenticated attackers to disclose arbitrary files on the target system by injecting path traversal sequences into the ID parameter. Multiple script endpoints are vulnerable, including downloadsys.pl, download_xml.pl, download.pl, downloadmib.pl, and downloadFile.pl, enabling attackers to read sensitive system files such as /etc/passwd.

Critical Impact

Authenticated attackers can leverage this directory traversal flaw to access sensitive configuration files, credentials, and system data, potentially leading to further system compromise.

Affected Products

• VideoFlow Digital Video Protection DVP 2.10

Discovery Timeline

• 2026-04-29 - CVE CVE-2018-25311 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2018-25311

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Path Traversal), a common weakness that occurs when software uses external input to construct pathnames without proper validation. In the case of VideoFlow Digital Video Protection DVP 2.10, the application fails to adequately sanitize user-supplied input in the ID parameter across multiple Perl download scripts.

The vulnerability requires authentication, meaning an attacker must first obtain valid credentials to the DVP system. However, once authenticated, the attacker can craft malicious requests containing directory traversal sequences (such as ../) to escape the intended directory structure and access files anywhere on the filesystem where the web server process has read permissions.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the download script handlers. The vulnerable scripts—downloadsys.pl, download_xml.pl, download.pl, downloadmib.pl, and downloadFile.pl—accept a user-controlled ID parameter that is used to construct file paths without properly filtering or neutralizing path traversal characters.

When the ID parameter contains sequences like ../../../etc/passwd, the application constructs a path that traverses outside the intended download directory, allowing access to arbitrary system files.

Attack Vector

The attack is conducted over the network against authenticated users of the VideoFlow DVP web interface. An attacker with valid credentials can submit HTTP requests to any of the vulnerable download endpoints with crafted ID parameters containing directory traversal payloads.

For example, an attacker could target the download.pl script with a request containing ../../../etc/passwd as the ID parameter value. The server processes this request and returns the contents of the /etc/passwd file, disclosing sensitive system user information. This attack pattern can be extended to access other sensitive files such as configuration files, private keys, or application data depending on the file permissions and the user context under which the web server operates.

For detailed technical information and proof-of-concept details, refer to the Zero Science Vulnerability Advisory ZSL-2018-5454 and Exploit-DB #44386.

Detection Methods for CVE-2018-25311

Indicators of Compromise

• HTTP requests to download scripts (downloadsys.pl, download_xml.pl, download.pl, downloadmib.pl, downloadFile.pl) containing ../ sequences in the ID parameter
• Web server access logs showing repeated requests to download endpoints with unusual parameter values
• Successful retrieval of system files like /etc/passwd, /etc/shadow, or configuration files through the web interface
• Anomalous file access patterns in system audit logs indicating reads of sensitive files by the web server process

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in HTTP parameters
• Monitor web server access logs for requests containing ../, ..%2f, %2e%2e/, or similar encoded traversal sequences
• Deploy intrusion detection system (IDS) signatures targeting known path traversal attack patterns against VideoFlow DVP endpoints
• Configure file integrity monitoring on sensitive system files to detect unauthorized access attempts

Monitoring Recommendations

• Enable detailed logging on the VideoFlow DVP application to capture all download requests and their parameters
• Set up alerts for any access to system configuration files from the web server process
• Regularly review authentication logs for suspicious login patterns that may precede exploitation attempts
• Monitor network traffic for exfiltration of sensitive file contents following successful directory traversal attacks

How to Mitigate CVE-2018-25311

Immediate Actions Required

• Restrict network access to the VideoFlow DVP web interface to trusted IP addresses only
• Implement additional authentication controls and review existing user accounts for unauthorized access
• Deploy a web application firewall configured to block path traversal attack patterns
• Consider taking the vulnerable system offline until a patch is available or mitigations are fully implemented

Patch Information

No vendor patch information is available in the CVE data. Organizations should contact VideoFlow directly for updated firmware or software versions that address this vulnerability. For additional context, consult the VulnCheck Advisory.

Workarounds

• Implement strict network segmentation to isolate the VideoFlow DVP system from untrusted networks
• Configure reverse proxy or WAF rules to sanitize the ID parameter by stripping path traversal sequences before requests reach the vulnerable scripts
• Restrict filesystem permissions for the web server user to limit accessible files
• Disable or remove unused download scripts if they are not required for normal operations

# Example: Restrict access to VideoFlow DVP using iptables
# Allow only trusted management network (example: 192.168.1.0/24)
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP