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 2969457 was released on 13.10.2020 and deals with "[CVE-2020-6366] Missing XML Validation in SAP NetWeaver (Compare Systems)" within Java. We advice you to follow the instructions, to resolve external entity tunneling (xxe) with a high potential for exploitation in component BC-JAS-ADM-MON.

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

Risk specification

SAP NetWeaver (Compare Systems) does not sufficiently validate uploaded XML documents.

Solution

The XML parser is now configured securely so that it does not allow external entities as part of an incoming XML document.

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

  • LMNWABASICMBEAN 7.20
  • LMNWABASICMBEAN 7.30
  • LMNWABASICMBEAN 7.31
  • LMNWABASICMBEAN 7.40
  • LMNWABASICMBEAN 7.50

 

Disclaimer

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

There is no disclosure of zero-day vulnerabilities. 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, ABEX only discloses issues where the fixing security note has been released at least three months ago. 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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