Advisory

A note with CVSS 6.1 for component CA-UI5-COR was released by SAP on 11.08.2020. The correction/advisory 2941170 was described with "Cross-Site Scripting (XSS) vulnerabilities in modified jQuery bundled with SAPUI5" and affects the system type SAPGUI / Frontend.

A workaround exists, according to SAP Security Advisory team. It is advisable to implement the correction as part of maintenance.

The vulnerability addressed is Cross-Site Scripting (XSS) within SAPGUI / Frontend.

Cross-site scripting (XSS) is the name of a class of security vulnerabilities that can occur in web-based applications. XSS combines all vulnerabilities that allow an attacker to inject HTML Markup and/or JavaScript into the front end of the affected web application.

XSS attacks can occur whenever the application dynamically creates its HTML/JavaScript/CSS content, which is passed to the user's web browser, and attacker-controlled values are used in this process. If these values are included in the generated code without proper validation and encoding, the attacker is able to include arbitrary coding snippets into the application's front end. The code is then rendered by the victim's web browser and interpreted in the victim's current authentication context.

Risk specification

This note has been re-released with updated 'Solution’ information. SAP UI5 and OpenUI5 do not sufficiently encode user controlled inputs, resulting in an Cross-Site Scripting (XSS) vulnerability which would allow an unauthenticated adversary to access sensitive information such as session credentials.

Solution

The vulnerability was fixed by removing the vulnerable code, to prevent a successful XSS attack.  And the good news, a workaround exists, too! This was suggested by the SAP security experts: "Cross-site scripting/request forgery filter engine on IDS/IPS/firewall systems. "

Affected System

Applications of the SAP GUI Family are SAP's universal clients for accessing SAP functionality in SAP applications. The GUI functions like a browser. It gets information from the SAP server like what, where, when and how, to display contents in its window. SAP GUI comes in the following three different flavors and exists in multiple versions:

  • SAP GUI for Windows
  • SAP GUI for the Java Environment
  • SAP GUI for HTML

Usage of an outdated SAP GUI application can pose security risk to SAP applications.

Detecting and preventing the use of obsolete front-end software is a challenge. Use SecurityBridge to detect and permanently eliminate the use of outdated versions.

The advisory is valid for

 

Disclaimer

ABEX takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability in one of the SAP software products – either in the latest or in a former product version follow the guidelines and processes in accordance with the SAP portal page “Report a Security Vulnerability to SAP”.

The advisories found within the ABEX security advisory are generated and continuously enriched by ABEX and affiliated security consultants, partners, customers of the SecurityBridge security suite, SAP support, and advisory groups.

There is no disclosure of zero-day vulnerabilities. In such case, the platform only provides details on which version or signature updates are available within the SecurityBridge platform in order to monitor or measure the vulnerability

In accordance with SAP guidelines, ABEX only discloses issues where the fixing security note has been released at least three months ago. The vulnerability platform makes no references to available exploits or Proof of Concepts (PoC). Advisories and vulnerabilities will always mention the fixing security note or hints to the corresponding SAP documentation.

 

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