SAP Enterprise Portal – XSLT injection

January 26, 2022

IMPACT ON BUSINESS This XSLT vulnerability allows an unprivileged authenticated attacker to execute an OS command as SAP administrator OS-level (sidadm). This results in a full compromise of the confidentiality, integrity and availability of the system. AFFECTED COMPONENTS DESCRIPTION SAP Enterprise Portal is a web frontend component for SAP Netweaver. 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 DETAILS The XSLT Engine of the SAP Portal application com.sapportals.wcm.repository.filter does not correctly handle malicious xslt injection type. With a low privilege user, it is possible to trigger the xslt engine to use an xsl file owned by the attacker. Privileges required for this attack :
  • User groups : Authenticated Users, Everyone
  • User roles : None
SOLUTION SAP has released SAP Note 3081888 which provides patched versions of the affected components. The patches can be downloaded from: https://launchpad.support.sap.com/#/notes/3074844. 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
Advisory Information
  • Public Release Date: 01/26/2022
  • Security Advisory ID: ONAPSIS-2021-0026
  • Vulnerability Submission ID: 889
  • Researcher(s): Yvan Genuer
Vulnerability Information
  • Vendor: SAP
  • Vulnerability Class: CWE-138: Improper Neutralization of Special Elements
  • CVSS v3 score: 9.9 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • Severity: Critical
  • CVE: CVE-2021-37531
  • Vendor patch Information: SAP Security Note 3081888
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
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