Medium Severity
Affected system
ABAP
CVSS
6.3
Component
CRM-BTX-BF-EBI
Patch Day
2020-07
Released on
2020/06/09
SAP Note
2541823
Workaround
Yes
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Releated advisories

Advisory

On 09.06.2020 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within ABAP.

SAP Note 2541823 addresses "Switchable authorization checks for RFC in SAP CRM (external billing)" to prevent missing authorization check with a medium risk for exploitation.

A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as project***, the team suggests.

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

An authenticated attacker can execute business function via calling function modules from remote without being properly authorized with business authorizations.

Solution

Additional authorization checks are introduced via the Switchable Authorization Framework (SACF) for new authorization object V_VBAK_AAT, function modules CRM_DELETE_OBSOLETE_DMR_ITEM, CRM_READ_DMR_ITEMS_FOR_CRM_SER, CRM_READ_DMR_ITEMS_FOR_CRM_W_D for Scenario CRM_SRV_EXT_BILLING - CRM External Billing RFC FM for Correction Reports  Circumstances exist that prevent the timely installation of a patch provided by the manufacturer. In such cases, you may consider applying the suggested workaround as a temporary or compensating mitigation: "Maintain strict governance on object S_RFC (no "*" in function groups or names) in all user roles. Alternatively, implement UCON and switch off remote capability of unused function modules.".

Affected System

The advisory 2541823 describes a problem within an ABAP based systems of a specific version. Affected versions are described below. ABAP software is deployed in various software components and is widely used within the SAP product portfolio.

SAP NetWeaver Application Server (formally known as SAP Web Application Server) is a building block of SAP NetWeaver. It is the foundation for most software products developed by SAP SE. SAP NetWeaver systems exist with Java and/or ABAP stacks. The advisory could be relevant for single and dual-stack ABAP installations.

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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