Advisory

On 08.09.2020 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within SAP Marketing.

SAP Note 2961991 addresses "[CVE-2020-6320] Improper Access Control in SAP Marketing (Mobile Channel Servlet)" to prevent missing authorization check 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.

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

The servlet reference implementation provided for the Mobile Channel Servlet in SAP Marketing allows an authenticated attacker to invoke certain functions that are restricted. The components exist within the technical architecture until 2017 and interact as a connector between customers' mobile applications and the SAP Cloud Platform (SCP).

Solution

Update the servlet to the new version. Thereafter the implementation will block unwanted URLs via web.xml. Additionally, the payload of URI requests using /$batch is scanned for its validity. Unfortunately, we are not aware whether customers have the ability to check the version of the servlet in use. 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: "Disable the SAP Cloud Platform Servlet Used by the SAP Marketing Mobile SDK as described in Note 2962970.".

The advisory is valid for

SAP_CUAN 130
SAP_CUAN 140
SAP_CUAN 150 ²
SAPSCORE 121

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 SAP Marketing

CVSS 9.6

Component CEC-MKT-MOB

Patch Day2020-09

Released on2020/09/08

SAP Note 2961991

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
SAP Marketing

_CVSS
9.6

_Component
CEC-MKT-MOB

_{Patch Day}
2020-09

_{Released
on}
2020/09/08

_{SAP Note}
2961991

_Workaround
Yes