Advisory

A note with CVSS 6.5 for component BC-SRV-PMI was released by SAP on 13.04.2021. The correction/advisory 3028729 was described with "[CVE-2021-27603] Denial of Service (DoS) in SAP NetWeaver AS of ABAP" 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 denial of service (dos) 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. Denial of Service (DoS) attacks that take a system offline may lead to significant cost for the company, studies quantify the costs in average between 4 and 5 millions dollars. Business continuity requires SAP systems staying online. The CVSS scores or vulnerability descriptions are not enough to represent how a simple bug can lead to a significant loss for companies.

Risk specification

An RFC-enabled function module SPI_WAIT_MILLIS in SAP NetWeaver AS ABAP allows an attacker to keep a work process busy for any length of time. The attacker could call this function module multiple times to block all work processes resulting in Denial of Service.

Solution

The respective function module is changed so that no code can be executed anymore which causes a delayed response.

Affected System

The advisory 3028729 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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Notifications

Affected system ABAP

CVSS 6.5

Component BC-SRV-PMI

Patch Day2021-04

Released on2021/04/13

SAP Note 3028729

Workaround No

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
ABAP

_CVSS
6.5

_Component
BC-SRV-PMI

_{Patch Day}
2021-04

_{Released
on}
2021/04/13

_{SAP Note}
3028729

_Workaround
No