PCI扫描因jQuery漏洞失败求助：POS系统漏洞定位与排查

Great question—this scenario is more common than you might think, even with systems that seem "non-web" like POS terminals. Let’s break this down step by step.

Why POS Systems Get Hit with jQuery Vulnerabilities #

Modern POS systems aren’t standalone, dumb devices anymore. Here’s why jQuery might be lurking:

• Embedded Web Interfaces: Most POS systems include a web-based admin panel (for configuring settings, running reports, or updating firmware) that runs on port 80. These interfaces often rely on jQuery for dynamic UI elements, just like regular web apps.
• Third-Party Integrations: POS systems frequently connect to payment gateways, inventory management tools, or cloud-based backends. These integrations may load their own frontend scripts—including outdated jQuery versions—into the POS’s web view or embedded browser.
• Legacy Components: Many POS vendors reuse code across products, and if they haven’t prioritized updating frontend libraries, old jQuery versions (like 1.7.1) can stick around for years.

The PCI scan detects the jQuery version by inspecting HTTP responses on port 80—even if the web interface is only meant for internal use, if it’s accessible to the scanner, it will flag the outdated library.

How to Locate the Program Using jQuery 1.7.1 #

Here’s a practical, step-by-step checklist to track down the culprit:

1. Map Port 80 to a Running Process
   • On Windows: Run netstat -ano | findstr ":80" to get the PID of the process using port 80. Then run tasklist /FI "PID eq [YOUR_PID]" to identify the program (e.g., a POS vendor’s service, a lightweight Apache/Nginx instance bundled with the POS).
   • On Linux/Embedded Systems: Run netstat -tulpn | grep :80 to find the PID and associated process. Use ps -p [YOUR_PID] to get details on the service.
2. Capture and Inspect HTTP Traffic
   • Use a tool like Wireshark or tcpdump to capture traffic on port 80. Filter for http.request to look at responses containing jQuery references (e.g., <script src="/static/js/jquery-1.7.1.min.js"></script>). The request path will tell you where the file is hosted on the system.
3. Search the POS System’s File System
   • For Windows-based POS: Search directories like C:\Program Files\[POS_VENDOR_NAME] for files named jquery*.js—check the file header or filename for the version number.
   • For embedded Linux POS: If you have SSH access, run find /opt/[POS_VENDOR_NAME] -name "jquery*.js" to locate the library files. If SSH isn’t enabled, use the vendor’s management console to browse the device’s file system.
4. Check Third-Party Integrations
   • Review all services your POS connects to (payment processors, inventory tools, etc.). Some integrations load their own web views within the POS software—reach out to these vendors to confirm if they’re using outdated jQuery and if an update is available.

Quick Notes on Fixing the Vulnerabilities #

• Don’t rush to upgrade directly to jQuery 3.x: While the scan recommends 3.0.0+, jQuery 3 removed many legacy APIs that your POS’s web interface might depend on. First, check if your POS vendor has an official patch or firmware update—they’ll have tested compatibility with newer jQuery versions.
• Temporary mitigations: If a vendor update isn’t available, you can manually patch the specific vulnerabilities (CVE-2012-6708 fixes the rquickExpr XSS flaw, CVE-2015-9251 addresses cross-domain AJAX XSS) but this is a stopgap. Prioritize getting an official update.
• Restrict access: If the web interface is only for internal use, configure your firewall to block external access to port 80 for POS terminals—this will reduce exposure while you fix the underlying issue.

内容的提问来源于stack exchange，提问作者John Townsend