# Onapsis Security Advisory 2021-0004: [CVE-2020-26820] - SAP Java OS
Remote Code Execution

## Impact on Business

A malicious authenticated attacker could abuse some particular services
exposed
by the SAP JAVA Netweaver allowing them to execute commands in the
underlying
operating system.

## Advisory Information

- Security Advisory ID: ONAPSIS-2021-0004
- Vulnerability Submission ID: 847
- Researcher: Pablo Artuso

## Vulnerability Information

- Vendor: SAP
- Affected Components:
- SAP Netweaver JAVA version 7.30 - 7.50

  (Check SAP Note 2979062 for detailed information on affected releases)

- Vulnerability Class: [CWE-434]  Unrestricted Upload of File with
Dangerous Type
- CVSS v3 score: 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
- Severity: Critical
- Assigned CVE: CVE-2020-26820
- Vendor patch Information: SAP Security NOTE 2979062

## Affected Components Description

SAP NetWeaver JAVA is a foundational layer which is used by several
SAP products, such as:

- SAP Enterprise portal
- SAP Solution Manager
- SAP PI/PO
- SAP Landscape Manager
- among others.

Due to the vulnerable components resides in this "foundational layer", all
products running on top of SAP JAVA NetWeaver will be affected by this
vulnerability.

## Vulnerability Details

A particular component (UDDI SERVER) of the SAP JAVA Netweaver layer,
exposes a functionality which allows authenticated attackers to upload
resources. In particular, at least the NWA_SUPERADMIN privileges are needed
to be able to use the upload process. Due to lack of controls, these files
are not checked and therefore any type of files could be uploaded,
resulting in the possibility of executing commands in the underlying OS.

## Solution

SAP has released SAP Note 2979062 which provide patched versions of the
affected components.

The patches can be downloaded from
https://service.sap.com/sap/support/notes/2979062.

Onapsis strongly recommends SAP customers to download the related security
fixes and apply them to the affected components in order to reduce business
risks.

## Report Timeline

- 10/05/2020: Onapsis sends details to SAP
- 10/05/2020: SAP provides internal ID’s.
- 10/12/2020: SAP confirms vulnerability and assigns CVSSv3 score of 9.1
(NLHN|C|HHH)
- 11/10/2020: SAP releases patch.

## References

* Onapsis blogpost:
https://onapsis.com/blog/sap-security-notes-november-2020
* CVE Mitre: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26820
* Vendor Patch: https://launchpad.support.sap.com/#/notes/2979062

## About Onapsis Research Labs

Onapsis Research Labs provides the industry analysis of key security issues
that impact business-critical systems and applications. Delivering frequent
and timely security and compliance advisories with associated risk levels,
Onapsis Research Labs combine in-depth knowledge and experience to deliver
technical and business-context with sound security judgment to the broader
information security community.

Find all reported vulnerabilities at
https://github.com/Onapsis/vulnerability_advisories

## About Onapsis, Inc.

Onapsis protects the mission-critical applications that run the  global
economy, from the core to the cloud. The Onapsis Platform uniquely delivers
actionable insight, secure change, automated
governance and continuous monitoring for critical systems—ERP, CRM, PLM,
HCM, SCM and BI applications—from leading vendors  such as SAP, Oracle,
Salesforce and others.

Onapsis is headquartered in Boston, MA, with offices in Heidelberg, Germany
and Buenos Aires, Argentina. We proudly serve more than 300 of the world’s
leading brands, including 20% of the Fortune 100, 6 of the top 10
automotive companies, 5 of the top 10 chemical companies,
4 of the top 10 technology companies and 3 of the top 10 oil and gas
companies.

The Onapsis Platform is powered by the Onapsis Research Labs, the team
responsible for the discovery and mitigation of more than 800 zero-day
vulnerabilities in mission-critical applications.
The reach of our threat research and platform is broadened through leading
consulting and audit firms such as Accenture, Deloitte, IBM, PwC and
Verizon—making Onapsis solutions the standard in helping organizations
protect their cloud, hybrid and on-premises mission-critical
information and processes.

For more information, connect with us on Twitter or LinkedIn, or visit us
at https://www.onapsis.com.

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