# Onapsis Security Advisory 2021-0013: [CVE-2020-26829] - Missing  
Authentication Check In SAP NetWeaver AS JAVA P2P Cluster  
## Impact on Business  
A malicious unauthenticated user could abuse the lack of authentication  
check on SAP Java P2P cluster communication, in order to connect to the  
respective TCP ports and perform different privileged actions, such as:  
- Installing new trusted SSO providers  
- Changing database connection parameters  
- Gaining access to configuration information  
## Advisory Information  
- Public Release Date: 06/14/2021  
- Security Advisory ID: ONAPSIS-2021-0013  
- Researcher(s): Ignacio D. Favro  
## Vulnerability Information  
- Vendor: SAP  
- Affected Components: SAP Netweaver JAVA version 7.10 - 7.50  
(Check SAP Note <XXX> for detailed information on affected releases)  
- Vulnerability Class: [CWE-306] Missing Authentication for Critical Function  
- CVSS v3 score: 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)  
- Risk Level: Critical  
- Assigned CVE: CVE-2020-26829  
- Vendor patch Information: SAP Security NOTE 2974774  
## Affected Components Description  
SAP Netweaver JAVA version 7.10 - 7.50  
(Check SAP Note #2974774 for detailed information on affected releases)  
## Vulnerability Details  
The Cluster Manager introduced in SAP AS Java since 7.10, listens by  
default on all interfaces.  
The TCP port where the CM listens is defined, as several SAP products,  
by a port pattern. In  
this case the following structure defined the port:  
Where <instance_numbers> refers to the JAVA instance number of the  
system and <node> the node  
number within the custer.  
Due to several missing authentication checks, a threat actor that is  
able to reach the Cluster  
Manager TCP port, could execute highly privileged actions allowing  
them to gain SAP system  
administrator access or perform denial of service without  
authentication among others.  
## Solution  
SAP has released SAP Note 2974774 which provide patched versions of the  
affected components.  
The patches can be downloaded  
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  
- 08/26/2020: Onapsis provides vulnerability details to SAP  
- 08/26/2020: SAP provides internal tracking number  
- 10/12/2020: SAP provides update: Vulnerability confirmed – fix in progress  
- 12/08/2020: SAP releases SAP Note fixing the issue.  
## References  
- Onapsis blogpost:  
- CVE Mitre:  
- Vendor Patch:  
## 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  
## 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, while keeping them protected and compliant.  
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## License  
This advisory is licensed under a [Creative Commons 4.0 BY-ND  
International License](  
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