Advisory
A note with CVSS 5.0 for component BC-BMT-WFM was released by SAP on 09.07.2024. The correction/advisory 3458789 was described with "[CVE-2024-34689] Server-Side Request Forgery in SAP Business Workflow (WebFlow Services)" and affects the system type ABAP.
A workaround does not exist, according to SAP Security Advisory team. It is advisable to implement the correction as monthly patch process.
The vulnerability addressed is server-side request forgery (ssrf) within ABAP.
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
This note has been re-released with updated correction instruction information. This note concerns a server-side request forgery vulnerability in SAP Business Workflow (WebFlow Services), which has been split into 3 notes. 3483993 is a prerequisite note for note 3458789 that implements an allowlist for WebFlow Services callback URLs. Note 3485805 then explains how to activate and configure the allowlist.Solution
An allowlist mechanism was introduced to check Callback URL's allowing only maintained URL's. Note this allowlist is activated by default. If you are using the described feature in SAP Business Workflow you need to configure the allowlist as described in the manual correction instructions which refers to note 3485805.
Affected System
The advisory 3458789 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
- SAP_BASIS 700-702 66
- SAP_BASIS 731 78
- SAP_BASIS 740 81
- SAP_BASIS 750-758 16
- 6.5 [CVE-2023-42477] Server-Side Request Forgery in SAP NetWeaver AS Java (GRMG Heartbeat application)
- 5.3 [CVE-2024-27898] Server-Side Request Forgery in SAP NetWeaver (tc~esi~esp~grmg~wshealthcheck~ear)
- 5.0 [CVE-2024-34689] Prerequisite for Security Note 3458789
- 5.0 [CVE-2024-34689] Allowlisting of callback-URLs in SAP Business Workflow (WebFlow Services)
