Onapsis Security Advisory 2022-0002: 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.

Advisory Information

• Public Release Date: 04/05/2021
• Security Advisory ID: ONAPSIS-2022-0002
• Researcher(s): Gaston Traberg

Vulnerability Information

• Vendor: SAP

• Affected Components:

  • Java NetWeaver Core 7.10-7.50

  (Check SAP Note 3056652 for detailed information on affected releases)

• Vulnerability Class: CWE-400 - Uncontrolled Resource Consumption

• CVSS v3 score: 7.5 (V:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

• Risk Level: High

• Assigned CVE: CVE-2021-33670

• Vendor patch Information: SAP Security NOTE 3056652

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

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 at
https://www.onapsis.com.

License

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