Advisory

On 09.03.2021 a security relevant correction has been released by SAP SE. The manufacturer resolves an issue within Java.

SAP Note 3022422 addresses "[CVE-2021-21481] Missing Authorization Check in SAP NetWeaver AS JAVA (MigrationService)" 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

This note has been re-released with updated link to the FAQ document. - The MigrationService, which is part of SAP NetWeaver, does not perform an authorization check allowing an unauthorized attacker to access configuration objects, including such that grant administrative privileges.

Solution

The MigrationService has been extended to properly check access restrictions. 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: "SAP provides also a temporary workaround, described in SAP Note 3030298. The workaround avoids the immediate system restart as it is an online deployment.".

Affected System

SAP Netweaver Application Server Java is part of the SAP NetWeaver Application Platform. It provides the complete infrastructure for deploying and running Java applications.

The AS Java Home: SAP Netweaver Application Server Java wiki
A dedicated SAP NetWeaver 7.40 Application Server for Java Security Guide exists.

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 Java

CVSS 9.6

Component BC-UPG-TLS-TLJ

Patch Day2021-03

Released on2021/03/09

SAP Note 3022422

Workaround Yes

Advisory

Risk specification

Solution

Affected System

Disclaimer

_{Affected system}
Java

_CVSS
9.6

_Component
BC-UPG-TLS-TLJ

_{Patch Day}
2021-03

_{Released
on}
2021/03/09

_{SAP Note}
3022422

_Workaround
Yes