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 3344295 was released on 08.08.2023 and deals with "[CVE-2023-37491] Improper Authorization check vulnerability in SAP Message Server" within Kernel. We advice you to follow the instructions, to resolve missing authorization check / improper authorization check with a high potential for exploitation in component BC-CST-MS.

According to SAP Security Advisory team a workaround exists. It is advisable to implement the correction as part of maintenance.

Risk specification

The Access Control List of the SAP Message Server could be bypassed, enabling an authenticated attacker to enter the network of the SAP systems served by the SAP Message server.

Solution

With the newer Kernal version, SAP Message Server no longer allows an Access Control List bypass. Alternativly, the consulting team has proposed the following: "As a workaround, the internal port of the Message Server can be protected. The profile parameter "system/secure_communication" needs to be set to "ON" and the trace level of the SAP Message Server should remain below 2". The suggestion may be considered, as a workaround or compensating mitigation. We recommend installing/applying the correction wherever possible and as soon as possible. Base your decision on whether or not to apply the patch on your companies and systems risk perspective and consider the provided CVSS 7.5 score.

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.

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Notifications

Affected system Kernel

CVSS 7.5

Component BC-CST-MS

Patch Day2023-08

Released on2023/08/08

SAP Note 3344295

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel

_CVSS
7.5

_Component
BC-CST-MS

_{Patch Day}
2023-08

_{Released
on}
2023/08/08

_{SAP Note}
3344295

_Workaround
Yes