Advisory

A note with CVSS 9.6 for component BC-CCM-PRN was released by SAP on 14.03.2023. The correction/advisory 3294595 was described with "[CVE-2023-27269] Directory Traversal vulnerability in SAP NetWeaver AS for ABAP and ABAP Platform" and affects the system type ABAP.

A workaround exists, according to SAP Security Advisory team. It is advisable to implement the correction as monthly patch process.

The vulnerability addressed is directory traversal 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.

Risk specification

This note has been re-released with updated 'Solution' information. SAP NetWeaver Application Server for ABAP and ABAP Platform allows an attacker with non-administrative authorizations to exploit a directory traversal flaw in an available service to overwrite the system files. In this attack, no data can be read but potentially critical OS files can be overwritten making the system unavailable.

Solution

The vulnerability Directory Path Traversal has been fixed by restricting user input to Path/file configured as logical filename. Although an alternative solution exists, it is advisable to apply the correction! This is the workaround, which was suggested by the SAP security experts: "An optional solution to this problem has already been delivered with the note 1512430. After the implementation of the correction instruction or support package of this note, unrestricted file access is not allowed anymore.".

Affected System

The advisory 3294595 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.

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 ABAP

CVSS 9.6

Component BC-CCM-PRN

Patch Day2023-03

Released on2023/03/14

SAP Note 3294595

Workaround Yes

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
ABAP

_CVSS
9.6

_Component
BC-CCM-PRN

_{Patch Day}
2023-03

_{Released
on}
2023/03/14

_{SAP Note}
3294595

_Workaround
Yes