CVE-2025-0584: Aenrich A+hrd SSRF Vulnerability

CVE-2025-0584 Overview

CVE-2025-0584 is a Server-Side Request Forgery (SSRF) vulnerability in the a+HRD human resources platform developed by aEnrich Technology. The flaw allows unauthenticated remote attackers to coerce the application into issuing arbitrary HTTP requests on behalf of the server. Attackers can leverage this behavior to enumerate internal hosts, identify listening services, and map network topology behind the perimeter. The vulnerability is classified under [CWE-918] and requires no authentication or user interaction, making it reachable directly over the network. TW-CERT issued advisories tracking this issue on the Taiwanese national vulnerability coordination platform.

Critical Impact
Unauthenticated attackers can abuse the a+HRD application as an SSRF pivot to probe internal network resources that are otherwise inaccessible from the internet.

Affected Products

aEnrich Technology a+HRD (all versions prior to the vendor-supplied fix)
Deployments exposing a+HRD web interfaces to untrusted networks
Enterprise HR environments integrating a+HRD with internal directory or file services

Discovery Timeline

2025-01-20 - CVE-2025-0584 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-0584

Vulnerability Analysis

The vulnerability resides in a request-handling component of a+HRD that accepts a user-supplied URL and issues a server-side HTTP request without sufficient validation of the destination. Because the application does not enforce an allowlist of permitted hosts or block requests to internal address ranges, attackers can direct the server to contact arbitrary endpoints. This turns the a+HRD server into a proxy for reconnaissance against internal infrastructure.

SSRF issues categorized as [CWE-918] typically expose cloud metadata services, internal administrative interfaces, and unauthenticated internal APIs. According to the published data, the confidentiality impact is limited to information gathered through probing rather than direct data exfiltration from the a+HRD application itself. The EPSS probability is 0.501%, indicating a low but non-zero likelihood of exploitation activity.

Root Cause

The root cause is missing validation of a URL parameter passed to a server-side HTTP client. The application trusts attacker-controlled input to determine the request destination, protocol, and path. Neither destination filtering nor DNS rebinding protection is applied before the outbound request executes.

Attack Vector

Exploitation occurs over the network against an internet-exposed a+HRD instance. An attacker submits a crafted request containing a URL that points to an internal IP address, hostname, or loopback interface. The a+HRD server issues the request and returns responses, timing signals, or error messages that reveal whether the target is reachable and what service is running. No credentials or user interaction are required.

Because no verified proof-of-concept has been published, exploitation details are described in prose only. See the TW-CERT Security Advisory for vendor-coordinated technical context.

Detection Methods for CVE-2025-0584

Indicators of Compromise

Outbound HTTP requests originating from the a+HRD application server directed at RFC1918 addresses, loopback interfaces, or cloud metadata endpoints such as 169.254.169.254
Web server access logs showing repeated requests to a+HRD endpoints that accept URL parameters, especially with encoded internal IPs or unusual schemes like file://, gopher://, or dict://
Unexpected DNS lookups from the a+HRD host to internal hostnames not part of normal application workflows

Detection Strategies

Inspect a+HRD web server logs for query parameters or POST bodies containing URLs, IP literals, or hex/octal encoded addresses
Correlate application-layer request logs with egress firewall telemetry to identify server-initiated connections to non-standard internal destinations
Deploy egress network monitoring to flag any a+HRD host reaching cloud metadata services or administrative interfaces

Monitoring Recommendations

Establish a baseline of legitimate outbound destinations from the a+HRD server and alert on deviations
Log and review all HTTP client activity generated by the application, including redirect chains that may bypass initial filters
Monitor for scanning patterns such as sequential internal IP requests or port sweeps sourced from the application host

How to Mitigate CVE-2025-0584

Immediate Actions Required

Apply the vendor-supplied patch from aEnrich Technology as referenced in the TW-CERT Security Notice
Restrict network access to a+HRD management interfaces so they are not reachable from untrusted networks
Place the a+HRD server behind an egress proxy that enforces an allowlist of legitimate outbound destinations

Patch Information

aEnrich Technology has coordinated remediation through TW-CERT. Administrators should contact the vendor or consult the TW-CERT Security Advisory for the latest fixed version and upgrade procedures.

Workarounds

Block outbound connections from the a+HRD host to internal management ranges, loopback, and cloud metadata IPs at the network layer
Deploy a web application firewall rule that rejects requests containing URL parameters referencing RFC1918 addresses or non-HTTP schemes
Disable or gate any a+HRD feature that fetches remote resources on behalf of the user until patching is complete

bash

# Example iptables egress restriction on the a+HRD host
iptables -A OUTPUT -d 169.254.169.254 -j DROP
iptables -A OUTPUT -d 10.0.0.0/8 -p tcp --dport 22 -j DROP
iptables -A OUTPUT -d 127.0.0.0/8 ! -o lo -j DROP