SAP Java OS Remote Code Execution

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. SAP Netweaver JAVA versions 7.30 through 7.50 are affected.

MD5 | 17d21dafdf0937311a146d93f842bdf8

# 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
by the SAP JAVA Netweaver allowing them to execute commands in the
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 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 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

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

## 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
- 11/10/2020: SAP releases patch.

## References

* Onapsis blogpost:
* CVE Mitre:
* Vendor Patch:

## About Onapsis Research Labs

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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

## About Onapsis, Inc.

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