Security Advisories

The Onapsis Research Labs delivers regular SAP^® and Oracle^® vulnerability research to our ecosystem of customers, partners and the information security industry.

Onapsis security advisories enable customers to better understand the security and business implications of discovered SAP and Oracle security issues. This enables organizations to prioritize patches, updates and their remediation strategies to ensure continuity of the business. Onapsis security advisories, together with vendor patches and security notes, are available for download to provide vendors and end-users with the necessary information to mitigate advanced threats to mission-critical applications running on SAP and Oracle.

High 04/05/2022 SAP Netweaver JAVA

Denial of Service in SAP NetWeaver JAVA

Impact On Business

This vulnerability can be used by an attacker to make a Denial of Service to SAP Netweaver Java, making HTTP server unavailable during attack execution.

Affected Components Description

One of the principal entry points in all SAP Application Server Java is the HTTP Web Server. As part of this service there are many standard components analyzing and preprocessing the data sent to and received from the users. Because these components are in a critical place, vulnerabilities on them are really serious and affect all NetWeaver JAVA based SAP Products.

Vulnerability Details

SAP Netweaver Java has a stack of standard J2EE filters responsable to do some controls and statistical operations over each received request. The vulnerability exists because one of those filters is keeping information about the different HTTP methods received by the server, but it is not properly controlling how much memory it needs to store that information. After sending a specially crafted request, an attacker is able to make that filter raise an OutOfMemoryError, making the virtual machine crash.

Solution

SAP has released SAP Note 3056652 which provides patched versions of the affected components.

The patches can be downloaded from https://launchpad.support.sap.com/#/notes/3056652

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

04-26-2021 - Onapsis provides details to SAP
04-29-2021 - SAP Provides a tracking number
05-10-2021 - SAP provides update: Vulnerability being fixed
07-12-2021 - SAP release patch #3056652
05-04-2022 - Advisory Published

REFERENCES

Onapsis blogpost:
https://onapsis.com/blog/sap-security-patch-day-july-2021-serious-vulnerabilities-sap-netweaver-java-fixed
CVE Mitre:
https://nvd.nist.gov/vuln/detail/CVE-2021-33670
Vendor Patch:
https://launchpad.support.sap.com/#/notes/3056652

Advisory Information

Public Release Date: 04/05/2022
Security Advisory ID: ONAPSIS-2022-0002
Vulnerability Submission ID: 882
Researcher(s): Gaston Traberg

Vulnerability Information

Vendor: SAP
Vulnerability Class: |LS|CWE-400|RS| Uncontrolled Resource Consumption
CVSS v3 score: 7.5 V:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: High
CVE: CVE-2021-33670
Vendor patch Information: SAP Security Note 3056652

ABOUT OUR RESEARCH LABS

Onapsis Research Labs provides the industry analysis of key security issues that impact mission-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

This advisory is licensed under a Creative Commons 4.0 BY-ND International License