CVE-2025-47149: i-FILTER Information Disclosure Flaw

CVE-2025-47149 Overview

CVE-2025-47149 affects the optional Anti-Virus & Sandbox feature of i-FILTER, a web filtering product developed by Digital Arts Inc. (DAJ). The vulnerability stems from improper validation of pattern files [CWE-348: Use of Less Trusted Source]. An attacker can supply a specially crafted pattern file that the product accepts as authorized. Successful exploitation may allow retrieval of information from the server hosting the product or trigger a denial of service (DoS) condition. The issue is network-exploitable and requires no authentication or user interaction.

Critical Impact
A crafted pattern file processed by the Anti-Virus & Sandbox feature can leak server-side information or crash the service, undermining the integrity of downstream malware scanning decisions.

Affected Products

i-FILTER with the optional Anti-Virus & Sandbox feature enabled
Digital Arts Inc. (DAJ) i-FILTER deployments referenced in DAJ Release Note #1057
See vendor advisory for exact affected build ranges

Discovery Timeline

2025-05-23 - CVE-2025-47149 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47149

Vulnerability Analysis

The Anti-Virus & Sandbox component of i-FILTER consumes pattern files that drive malware detection and sandbox behavior. The component does not sufficiently verify the origin or integrity of these pattern files before loading them. As a result, a file supplied by an unauthorized source can be treated as trusted vendor content. Once loaded, the crafted pattern data influences how the scanning engine parses and reacts to input. Depending on the structure of the file, the engine may return internal server data or enter an unrecoverable state, producing a denial of service.

Root Cause

The root cause is classified under [CWE-348: Use of Less Trusted Source]. The product relies on insufficient trust signals — such as a missing or bypassable authenticity check — when accepting pattern files. Because the trust boundary between the update channel and the local scanning engine is weak, a substituted file bypasses validation and reaches privileged parsing logic.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker positioned to influence the pattern file consumed by i-FILTER — for example, by tampering with a delivery path or hosting a malicious pattern file that the product can be induced to fetch — can trigger the flaw. Successful delivery causes the scanning engine to process attacker-controlled content, leading to information disclosure from the server or a DoS condition. The vulnerability affects integrity of scan decisions rather than direct code execution.

No verified public exploit code or proof-of-concept has been published. Refer to the JVN Security Bulletin JVN68079883 and DAJ Release Note #1057 for vendor-supplied technical detail.

Detection Methods for CVE-2025-47149

Indicators of Compromise

Unexpected pattern file updates on i-FILTER hosts that do not correlate with legitimate DAJ update windows
Repeated crashes or restarts of the Anti-Virus & Sandbox scanning process
Outbound traffic from the i-FILTER server to non-DAJ domains during pattern file retrieval
Anomalous file writes to the pattern file directory outside of scheduled update jobs

Detection Strategies

Baseline the checksum and source of every pattern file the product loads, and alert on deviations
Monitor process telemetry on the i-FILTER host for abnormal exits, memory spikes, or exception events tied to the scanning engine
Inspect DNS and HTTP telemetry for pattern update requests directed to hosts other than the official DAJ update infrastructure

Monitoring Recommendations

Forward i-FILTER application logs and host telemetry to a centralized data lake for correlation
Enable file integrity monitoring (FIM) on directories that store pattern files
Alert on service restarts or watchdog-triggered recoveries of the Anti-Virus & Sandbox module

How to Mitigate CVE-2025-47149

Immediate Actions Required

Apply the fixed build identified in DAJ Release Note #1057 as soon as possible
Verify that the Anti-Virus & Sandbox optional feature is only enabled on hosts that require it
Audit the network path used to retrieve pattern files and restrict egress to the official DAJ update endpoints

Patch Information

Digital Arts Inc. has released a fixed version of i-FILTER that corrects the pattern file validation logic. Administrators should consult DAJ Release Note #1057 for the specific patched build and upgrade instructions, and cross-reference the coordinated advisory at JVN68079883 for scope confirmation.

Workarounds

Restrict outbound network access from the i-FILTER server so that only official DAJ update infrastructure is reachable
Disable the optional Anti-Virus & Sandbox feature on hosts where it is not operationally required until patching is complete
Enforce file integrity monitoring on the pattern file directory and alert on any write not originating from the legitimate update process

bash

# Example: restrict egress from the i-FILTER host to DAJ update endpoints only
# Replace <daj_update_host> with the vendor-published update hostname or IP range
iptables -A OUTPUT -p tcp -d <daj_update_host> --dport 443 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -j DROP