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 3000897 was released on 09.02.2021 and deals with "[CVE-2021-21475] Directory Traversal vulnerability in SAP NetWeaver Master Data Management 7.1" within Java. We advice you to follow the instructions, to resolve directory traversal (read) with a medium potential for exploitation in component MDM-FN-MDS-SEC.

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

Risk specification

Through specific circumstances SAP NetWeaver Master Data Management (MDM) allows an unauthenticated attacker, due to insufficient validation, to exploit path information provided by the users. The attacker could read the content of arbitrary files and expose sensitive data.

Solution

A restriction is added in the MDM server settings (mds.ini file) to restrict access only to files inside directories but not subdirectories.

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 AS Java Home: SAP Netweaver Application Server Java wiki
A dedicated SAP NetWeaver 7.40 Application Server for Java Security Guide exists.

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.

Protecting your SAP^© systems against exploitation of directory traversal vulnerabilities is almost impossible without usage of an appropriate cybersecurity software.

Custom coding may be introduced at any moment. According to statistic, at least one vulnerability exists in a set of 1.000 source code lines. In consequence continuous code vulnerability assements are needed to protect your assets.

Code vulnerabilty analysis

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Notifications

Affected system Java

CVSS 4.0

Component MDM-FN-MDS-SEC

Patch Day2021-02

Released on2021/02/09

SAP Note 3000897

Workaround No

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
4.0

_Component
MDM-FN-MDS-SEC

_{Patch Day}
2021-02

_{Released
on}
2021/02/09

_{SAP Note}
3000897

_Workaround
No