Advisory

A note with CVSS 5.4 for component BC-FES-WGU was released by SAP on 12.03.2024. The correction/advisory 3377979 was described with "[CVE-2024-27902] Cross-Site Scripting (XSS) vulnerability in SAP NetWeaver AS ABAP, applications based on SAPGUI for HTML (WebGUI)" and affects the system type Kernel.

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 Kernel.

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

SAP GUI for HTML in SAP Netweaver AS ABAP does not sufficiently encode user controlled inputs, resulting in a Cross-Site Scripting (XSS) vulnerability which would allow an authenticated attacker to steal session credentials.

Solution

URL parameters are now properly encoded to prevent a successful XSS attack. Although an alternative solution exists, it is advisable to apply the correction! This is the workaround, which was suggested by the SAP security experts: "Cross-site scripting/request forgery filter engine on IDS/IPS/firewall systems. ".

The advisory is valid for

KERNEL 7.89 ¹⁶
KERNEL 7.93 ¹⁰

Releated advisories

Disclaimer

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Notifications

Affected system Kernel

CVSS 5.4

Component BC-FES-WGU

Patch Day2024-03

Released on2024/03/12

SAP Note 3377979

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel

_CVSS
5.4

_Component
BC-FES-WGU

_{Patch Day}
2024-03

_{Released
on}
2024/03/12

_{SAP Note}
3377979

_Workaround
Yes