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 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

LMNWABASICMBEAN 7.20
LMNWABASICMBEAN 7.30
LMNWABASICMBEAN 7.31
LMNWABASICMBEAN 7.40
LMNWABASICMBEAN 7.50

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 Java

CVSS 7.6

Component BC-JAS-ADM-MON

Patch Day2020-10

Released on2020/10/13

SAP Note 2969457

Workaround No

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
7.6

_Component
BC-JAS-ADM-MON

_{Patch Day}
2020-10

_{Released
on}
2020/10/13

_{SAP Note}
2969457

_Workaround
No