Advisory

On 09.11.2021 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Kernel.

SAP Note 3099776 addresses "[CVE-2021-40501] Missing Authorization check in ABAP Platform Kernel" to prevent missing authorization check with a hot news risk for exploitation.

A workaround does not 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 ABAP Platform Kernel as of release 7.77 allows authenticated users to read or modify data beyond the vulnerable system resulting in escalation of privileges.

Solution

The ABAP Platform Kernel has been corrected to perform a full authorization check for incoming Trusted-RFC connections for authorization object S_RFCACL including authorization field RFC_TCODE if this field is activated in the settings of the trust relationship.

The advisory is valid for

KERNEL 7.77 ³⁴
KERNEL 7.81 ²⁴
KERNEL 7.85 ²⁵
KERNEL 7.86 ¹⁰

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.

SecurityBridge - Code vulnerabilty analysis

Secure code
Customer created code contains security risks. Use modern technologies to detect coding flaws mitigate unneccessary risks. Start to detect:

Open & Native SQL Injection
Potential backdoors
Insuffient authorization checks of user administration bypassed
Injections of operating system commands
and many more..

Start scanning for ABAP Code vulnerabilities

Follow @_securitybridge

Notifications

Affected system Kernel

CVSS 9.6

Component BC-MID-RFC

Patch Day2021-11

Released on2021/11/09

SAP Note 3099776

Workaround No

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
Kernel

_CVSS
9.6

_Component
BC-MID-RFC

_{Patch Day}
2021-11

_{Released
on}
2021/11/09

_{SAP Note}
3099776

_Workaround
No