# Onapsis Security Advisory 2021-0013: [CVE-2020-26829] - Missing Authentication Check In SAP NetWeaver AS JAVA P2P Cluster communication ## 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: **50000+100*<instance_number>+20+<node>*5**, 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 fromhttps://launchpad.support.sap.com/#/notes/2974774. 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: https://onapsis.com/blog/sap-security-notes-december-2020 - CVE Mitre: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26829 - Vendor Patch: https://launchpad.support.sap.com/#/notes/2974774 ## 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, while keeping them protected and compliant. For more information, connect with us on Twitter or LinkedIn, or visit us athttps://www.onapsis.com. ## License This advisory is licensed under a [Creative Commons 4.0 BY-ND International License](https://creativecommons.org/licenses/by-nd/4.0/legalcode) -- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.