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 3340576 was released on 12.09.2023 and deals with "[CVE-2023-40309] Missing Authorization check in SAP CommonCryptoLib" within Kernel, HANA platform, Web Dispatcher. We advice you to follow the instructions, to resolve missing authorization check with a hot news potential for exploitation in component BC-IAM-SSO-CCL.

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

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

SAP CommonCryptoLib does not perform necessary authentication checks, which may result in missing or wrong authorization checks for an authenticated user, resulting in escalation of privileges.

Solution

The verification of JavaScript Web Tokens (JWT) and raw signatures have been updated to now include the correct authorization checks.

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, HANA...

CVSS 9.8

Component BC-IAM-SSO-CCL

Patch Day2023-09

Released on2023/09/12

SAP Note 3340576

Workaround No

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel, HANA...

_CVSS
9.8

_Component
BC-IAM-SSO-CCL

_{Patch Day}
2023-09

_{Released
on}
2023/09/12

_{SAP Note}
3340576

_Workaround
No