# Onapsis Security Advisory 2021-0026: SAP Enterprise Portal - XSLT
injection

## Impact on Business

This XSLT vulnerability allows an unprivileged authenticated attacker to
execute OS commands as SAP administrator OS-level (sidadm). A successful
attack would
result in a full compromise of the system's confidentiality, integrity and
availability.


## Advisory Information

- Public Release Date: 01/26/2022
- Security Advisory ID: ONAPSIS-2021-0026
- Researcher(s): Yvan Genuer


## Vulnerability Information

- Vendor: SAP
- Affected Components:
  - ENGINEAPI 7.10
  - ENGINEAPI 7.30
  - ENGINEAPI 7.31
  - ENGINEAPI 7.40
  - ENGINEAPI 7.50

  (Check SAP Note 3081888 for detailed information on affected releases)

- Vulnerability Class: CWE-138
- CVSS v3 score: 9.9 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Risk Level: Critical
- Assigned CVE: CVE-2021-37531
- Vendor patch Information: SAP Security NOTE 3081888


## Affected Components Description

SAP Enterprise Portal is a web frontend component for SAP Netweaver.


## Vulnerability Details

The XSLT Engine of the SAP Portal application
```com.sapportals.wcm.repository.
filter``` does not correctly handle malicious xslt injections. With a low
privilege user, it is possible to trigger the xslt engine to use an xsl file
owned by the attacker.

The necessary privileges required to execute this attack are:
 - User groups : Authenticated Users, Everyone
 - User roles : None


## Solution

SAP has released SAP Note 3081888 which provide patched versions of the
affected components.

The patches can be downloaded from
https://launchpad.support.sap.com/#/notes/3081888.

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

 - 06/28/2021: Onapsis sends details to SAP
 - 06/28/2021: SAP provides internal ID
 - 09/14/2021: SAP releases SAP Note fixing the issue.


## References

- Onapsis blogpost:
https://www.onapsis.com/blog/sap-security-patch-day-september-2021
- CVE Mitre:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37531
- Vendor Patch:
https://launchpad.support.sap.com/#/notes/3081888


## 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](https://creativecommons.org/licenses/by-nd/4.0/legalcode)
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