CVE-2022-22531 - Unrestricted File Upload Exploit in SAP S/4HANA's F0743 Create Single Payment Application

Security researchers have recently discovered a severe vulnerability in the F0743 Create Single Payment application of SAP S/4HANA, affecting versions 100, 101, 102, 103, 104, 105, and 106. This post will go into detail about the vulnerability, walking through the code snippet, original references, and exploit details. The vulnerability, identified as CVE-2022-22531, allows attackers with basic user rights to bypass security restrictions and execute arbitrary script code by uploading or downloading files without proper validation.

Vulnerability Overview

The F0743 Create Single Payment application of SAP S/4HANA is an essential tool for businesses to manage financial transactions. However, the vulnerable versions do not perform adequate checks for uploaded or downloaded files, leaving room for malicious activities by attackers.

The flaw allows an attacker with minimal access, such as a basic user, to execute arbitrary script code by uploading or downloading files without proper validation. The execution of unauthorized scripts can lead to sensitive information being disclosed or modified, posing a significant threat to the integrity and confidentiality of the organization's financial data.

Code Snippet

The vulnerability can be exploited by crafting a specially formatted file containing the desired script code which bypasses the weak security checks in the vulnerable F0743 Create Single Payment application. An example of a file that can be used to exploit the vulnerability is shown below:

<script>
// Arbitrary script code here
alert('XXE injection!');
</script>

An attacker can upload this file to the application, and when it's downloaded and processed by the system, the malicious script will be executed, leading to potential sensitive data leakage or unauthorized modifications.

Original References

The vulnerability's details and presence in SAP S/4HANA were first made public by SAP itself, through their security advisory SAP Security Note 3229672. The advisory provides additional details on the affected components and potential impact of the vulnerability.

Additional information and analysis of the vulnerability can be found in the following resources

- NIST National Vulnerability Database (NVD) entry for CVE-2022-22531
- MITRE CVE entry for CVE-2022-22531

Exploit Details

Exploiting the vulnerability can be relatively simple for attackers with basic user privileges on the vulnerable application. Since the application does not perform proper validation of uploaded or downloaded files, an attacker can craft a malicious file containing the desired script code and upload it to the application.

Once the file is uploaded, the attacker can trigger the execution of the script embedded in the uploaded file by causing it to be downloaded and processed by the application. This can lead to the unauthorized disclosure of sensitive information or unauthorized modifications to financial data.

Due to the ease of exploitation, it's essential for enterprises using the affected SAP S/4HANA versions to secure their systems by applying the appropriate patches provided by SAP in their Security Note 3229672.

Conclusion

CVE-2022-22531 is a critical vulnerability in the F0743 Create Single Payment application of SAP S/4HANA, affecting versions 100-106. This vulnerability allows attackers with basic user rights to execute arbitrary script code by uploading or downloading files without proper validation, potentially leading to sensitive information disclosure or unauthorized modifications. Organizations using the affected SAP S/4HANA versions must apply the available security patches and ensure proper file validation to mitigate the risk posed by this vulnerability.

Timeline

Published on: 01/14/2022 20:15:00 UTC
Last modified on: 01/21/2022 21:13:00 UTC