Advisory

On 14.06.2022 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within SAProuter.

SAP Note 3158375 addresses "[CVE-2022-27668] Improper Access Control of SAProuter for SAP NetWeaver and ABAP Platform" to prevent missing authorization check with a high risk for exploitation.

A workaround does exist, according to SAP Security Advisory team. It is advisable to implement the correction as monthly patch process, 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

SAProuter for SAP NetWeaver and ABAP Platform allows through improper configuration in the route permission table "saprouttab" to execute SAProuter administration commands.

Solution

SAProuter now restricts properly administration commands as intended. 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: "A workaround is to replace all wildcards for the target host in saprouttab 'P' and 'S' entries with specific hostnames or IP addresses. Please assess the workaround applicability for your SAP landscape prior to implementation. Note that this workaround is a temporary fix and is not a permanent solution. SAP strongly recommends you apply the corrections outlined in the security note, which can be done in lieu of the workaround or after the workaround is implemented.".

The advisory is valid for

KERNEL 7.49 ²³
KERNEL 7.77 ³⁴
KERNEL 7.81 ²⁴
KERNEL 7.85 ²⁵
KERNEL 7.86 ¹⁰
KERNEL 7.87 ⁷
KERNEL 7.88 ⁵
KRNL64NUC 7.49 ²⁴
KRNL64UC 7.49 ²⁴
SAP_ROUTER 7.22
SAP_ROUTER 7.53

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 SAProuter

CVSS 8.6

Component BC-CST-NI

Patch Day2022-06

Released on2022/06/14

SAP Note 3158375

Workaround Yes

Advisory

Risk specification

Solution

Disclaimer

_{Affected system}
SAProuter

_CVSS
8.6

_Component
BC-CST-NI

_{Patch Day}
2022-06

_{Released
on}
2022/06/14

_{SAP Note}
3158375

_Workaround
Yes