Medium Severity
Affected system
Java
CVSS
6.5
Component
BC-JAS-ADM-ADM
Patch Day
2021-04
Released on
2021/04/13
SAP Note
3027937
Workaround
No
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Releated advisories

Advisory

SAP takes the security of its vast product portfolio very seriously and thus releases security fixes for vulnerabilities reported by external researchers and their customers every second Tuesday of the month.

SAP Note 3027937 was released on 13.04.2021 and deals with "[CVE-2021-27598] Improper Access Control in SAP NetWeaver AS for Java (Customer Usage Provisioning Servlet)" within Java. We advice you to follow the instructions, to resolve missing authorization check with a medium potential for exploitation in component BC-JAS-ADM-ADM.

According to SAP Security Advisory team a workaround does not exist. It is advisable to implement the correction as part of maintenance.

Missing authority checks are still the most common security defect related to authorizations in custom code. Since SAP uses an explicit authorization model, an authority checks must be coded in order to be executed. If an explicit check is not coded, all users have access. This type of vulnerability not only exists in SAP standard it also exists in customer coding. Check your custom developments for vulnerabilities that pose a risk to your systems. SecurityBridge helps detect code vulnerabilities before they are implemented in production.

Risk specification

A servlet in SAP NetWeaver AS meant Java Customer Usage Provisioning (CUP) is not properly protected resulting in improper access control.

Solution

Appropriate authentication and authorization checks have been added to the CUP servlet of the SAP NetWeaver AS.

Affected System

SAP Netweaver Application Server Java is part of the SAP NetWeaver Application Platform. It provides the complete infrastructure for deploying and running Java applications.

The advisory is valid for

 

Releated advisories
 

Disclaimer

SecurityBridge takes the security of SAP products very seriously. We very much encourage the responsible disclosure of security vulnerabilities. If you have detected a vulnerability concerning 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 SecurityBridge advisory are generated and continuously enriched by our Team at SecurityBridge and affiliated security consultants, partners, customers of the SecurityBridge Platform, SAP support, and advisory groups.

We do not disclose zero-day vulnerabilities unless a security patch has been made available to the public. 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, SecurityBridge only discloses issues where the fixing security note has been released. 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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