A vulnerability has been found in SAP Kernel (version now known) and classified as critical. Affected by this vulnerability is some unknown processing of the component Trusted RFC Connection Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A Trusted RFC connection in SAP KERNEL 32NUC, SAP KERNEL 32Unicode, SAP KERNEL 64NUC, SAP KERNEL 64Unicode 7.21, 7.21EXT, 7.22, 7.22EXT; SAP KERNEL from 7.21 to 7.22, 7.45, 7.49, can be established to a different client or a different user on the same system, although no explicit Trusted/Trusting Relation to the same system has been defined.

The bug was discovered 12/12/2017. The weakness was published 12/12/2017 (Website). It is possible to read the advisory at blogs.sap.com. This vulnerability is known as CVE-2017-16689 since 11/09/2017. The attack can be launched remotely. Required for exploitation is a single authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 01/26/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at 110506, 110507, 110508 and 110509.

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• SAP

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• Kernel

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• commercial

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