CVE-2025-7938

Executive Summary

CVE-2025-7938 is a critical authorization bypass vulnerability identified in the updateGoods function of GoodsController.java within the JPACookieShop (蛋糕商城JPA版) application, version 1.0, developed by jerryshensjf. The flaw allows an unauthenticated remote attacker to manipulate goods data without proper authorization checks. The exploit has been publicly disclosed, increasing the risk of active exploitation. No official patch is currently available from the vendor.

Supply Chain & Package Security

This vulnerability is not associated with a package manager (NPM, PyPI, Go, Ruby) but is a standalone Java application. Supply chain risk is limited to the direct use of the unpatched application.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited data exposure possible.
• Integrity Impact: Low (I:L) – Unauthorized modification of goods data.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: Medium. The low EPSS score (0.0%) suggests limited active exploitation currently, but the public PoC and lack of patch elevate the risk for exposed instances.

Deep Dive & Mechanics

The vulnerability resides in the updateGoods method of GoodsController.java. This endpoint is intended to allow authorized users (e.g., administrators) to update product information in the shopping cart application. However, the controller fails to enforce proper authorization checks before processing the request.

Root Cause: Missing or insufficient access control annotations (e.g., @PreAuthorize, @Secured, or manual role checks) on the updateGoods endpoint. The method likely accepts HTTP PUT or POST requests with goods data (e.g., price, stock, description) and directly updates the database without verifying the caller's identity or permissions.

Attack Vector: An attacker sends a crafted HTTP request to the vulnerable endpoint (e.g., /goods/update or similar) with modified JSON/XML payload containing arbitrary goods data. Since no authentication is required, the request is processed, leading to unauthorized modification of goods.

Impact: An attacker can alter product prices, descriptions, stock levels, or other attributes, potentially causing financial loss, data integrity issues, or reputational damage.

Vulnerable vs. Patched Code

Vulnerable Code (GoodsController.java - snippet):

@RestController
@RequestMapping("/goods")
public class GoodsController {

    @Autowired
    private GoodsService goodsService;

    // Missing authorization check
    @PutMapping("/update")
    public ResponseEntity<?> updateGoods(@RequestBody Goods goods) {
        goodsService.updateGoods(goods);
        return ResponseEntity.ok("Goods updated successfully");
    }
}

Patched Code (Hypothetical fix):

@RestController
@RequestMapping("/goods")
public class GoodsController {

    @Autowired
    private GoodsService goodsService;

    @PreAuthorize("hasRole('ADMIN')")
    @PutMapping("/update")
    public ResponseEntity<?> updateGoods(@RequestBody Goods goods) {
        goodsService.updateGoods(goods);
        return ResponseEntity.ok("Goods updated successfully");
    }
}

The patched version adds @PreAuthorize("hasRole('ADMIN')") to restrict access to authenticated administrators only. Alternatively, manual checks using SecurityContextHolder could be implemented.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running JPACookieShop 1.0 with the vulnerable endpoint exposed.
• Network access to the application (e.g., http://target:8080).

Exploit Steps:

1. Identify the vulnerable endpoint (e.g., via directory brute-forcing or source code analysis).
2. Craft a malicious HTTP PUT request to update a goods item.

Example Exploit (cURL):

curl -X PUT http://target:8080/goods/update \
  -H "Content-Type: application/json" \
  -d '{"id": 1, "name": "Hacked Item", "price": 0.01, "stock": 9999}'

Expected Result: The goods item with ID 1 is updated to have a price of $0.01 and stock of 9999, without any authentication.

Blue Team (Detection & Response)

Detection Steps:

1. Monitor for unauthorized PUT/POST requests to /goods/update or similar endpoints.
2. Look for anomalous changes in goods data (e.g., sudden price drops, stock increases).
3. Check web server logs for requests without session tokens or authentication headers.

Response:

1. Immediately isolate the affected server.
2. Review and revert any unauthorized changes to goods data.
3. Implement temporary access controls (e.g., IP whitelisting) until a patch is applied.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP PUT/POST requests to /goods/update without authentication headers.
  • Unusual JSON payloads containing id, price, stock fields with extreme values.
• File IOCs:
  • Modified entries in the goods database table (e.g., goods).
• Log IOCs:
  • Web server logs showing 200 responses to /goods/update from unauthenticated IPs.

Detection Engineering

YARA Rule

rule CVE_2025_7938_JPACookieShop_GoodsController {
    meta:
        description = "Detects exploitation attempts against CVE-2025-7938 in JPACookieShop"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-7938"
    strings:
        $s1 = "/goods/update" ascii wide nocase
        $s2 = "updateGoods" ascii wide nocase
        $s3 = "GoodsController" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-7938 - Unauthorized Goods Update Attempt
id: 8a3f7c2e-5d1b-4a9f-8c6e-2b1d3f4a5c6e
status: experimental
description: Detects HTTP PUT/POST requests to /goods/update without authentication
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: ['PUT', 'POST']
        cs-uri-stem: '/goods/update'
    condition: selection
falsepositives:
    - Legitimate admin actions (if authentication is present)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-7938 - JPACookieShop GoodsController Unauthorized Update";
    flow:to_server,established;
    content:"PUT"; http_method;
    content:"/goods/update"; http_uri;
    sid:1000001;
    rev:1;
    reference:cve,2025-7938;
    classtype:attempted-admin;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint if possible, by removing or commenting out the updateGoods method in GoodsController.java.
2. Implement network-level access controls (e.g., firewall rules, VPN) to restrict access to the application to trusted IPs only.
3. Apply a Web Application Firewall (WAF) rule to block requests to /goods/update without valid authentication tokens.

Long-term Fix:

1. Apply proper authorization checks as shown in the patched code example (e.g., Spring Security annotations).
2. Conduct a full security audit of all controller endpoints for similar missing authorization issues.
3. Monitor the vendor's repository for an official patch and apply it promptly when released.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence Division. For questions or further analysis, contact threatintel@valtersit.com.