Advisory

On 14.04.2020 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Java.

SAP Note 2896682 addresses "[CVE-2020-6225] Directory Traversal vulnerability in SAP NetWeaver (Knowledge Management)" to prevent directory traversal (read/write) with a hot news risk for exploitation.

A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as part of maintenance, the team suggests.

Risk specification

SAP NetWeaver Knowledge Management does not sufficiently validate path information provided by users, thus characters representing ‘traverse to parent directory’ are passed through to the file APIs ,allowing an attacker to overwrite, delete, or corrupt arbitrary files on the remote server, leading to Path Traversal.

Solution

SAP NetWeaver Knowledge Management has been updated to include additional checks on the parameter. Circumstances exist that prevent the timely installation of a patch provided by the manufacturer. In such cases, you may consider applying the suggested workaround as a temporary or compensating mitigation: "The issue is about uploading files into the Portal which require authorizations for Portal Content administration. Therefore you should verify which users are assigne to role pcd:portal_content/administrator/content_admin/content_admin_role".

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

KMC-CM 7.00-7.02
KMC-CM 7.30 ⁶
KMC-CM 7.31 ⁶
KMC-CM 7.40 ⁶
KMC-CM 7.50 ⁶
KMC-WPC 7.30
KMC-WPC 7.31
KMC-WPC 7.40
KMC-WPC 7.50 ²

Releated advisories

7.3 Directory traversal in SAP Environment Health and Safety

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 9.1

Component EP-KM-CM-UI

Patch Day2020-04

Released on2020/04/14

SAP Note 2896682

Workaround Yes

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
9.1

_Component
EP-KM-CM-UI

_{Patch Day}
2020-04

_{Released
on}
2020/04/14

_{SAP Note}
2896682

_Workaround
Yes