[ERPSCAN-16-041] SAP NETWEAVER DIRECTORY CREATION OUTSIDE OF THE JVM

[ERPScan inc <erpscan.online@xxxxxxxxx>]

Application: SAP NetWeaver
Versions Affected: SAP NetWeaver AS JAVA UMEADMIN component
Vendor URL: http://SAP.com
Bugs: Directory traversal
Reported:  04.12.2015
Vendor response: 05.12.2015
Date of Public Advisory: 13.12.2016
Reference: SAP Security Note 2310790
Author: Mathieu Geli (ERPScan)

Description

1. ADVISORY INFORMATION
Title: [ERPSCAN-16-041] SAP NETWEAVER DIRECTORY CREATION OUTSIDE OF THE JVM
Advisory ID: [ERPSCAN-16-041]
Risk: medium
Advisory URL: https://erpscan.com/advisories/erpscan-16-041-sap-netweaver-directory-creation-outside-jvm/
Date published:13.12.2016
Vendors contacted: SAP

2. VULNERABILITY INFORMATION

Class: Directory traversal
Impact: deletion of critical file system content
Remotely Exploitable: yes
Locally Exploitable: no

CVSS Information
CVSS Base Score v3:    6.8 / 10
CVSS Base Vector:

AV : Attack Vector (Related exploit range) Network (N)
AC : Attack Complexity (Required attack complexity) Low (L)
PR : Privileges Required (Level of privileges needed to exploit) High (H)
UI : User Interaction (Required user participation) None (N)
S : Scope (Change in scope due to impact caused to components beyond
the vulnerable component) Changed (C)
C : Impact to Confidentiality None (N)
I : Impact to Integrity High (H)
A : Impact to Availability None (N)

3. VULNERABILITY DESCRIPTION

An authenticated user through SAP Netweaver web administration can
trigger directory creation anywhere where the SAP OS user has access.

4. VULNERABLE PACKAGES


UMEADMIN 7.00
UMEADMIN 7.10
UMEADMIN 7.20
UMEADMIN 7.30
UMEADMIN 7.31
UMEADMIN 7.40
UMEADMIN 7.50

5. SOLUTIONS AND WORKAROUNDS
To correct this vulnerability, install SAP Security Note 2310790

6. AUTHOR
Mathieu Geli (ERPScan)

7. TECHNICAL DESCRIPTION
SAP Netweaver Admin Console allows an authenticated user through the
"Consistency Check" web service to create any directory with SAP OS
user rights outside of the JVM.
The default directory is "/tmp" but can be set to any other directory.



7.1. Proof of Concept

Login as Administrator to http://sapserver:50000
Go to "Identify Management"
Select "Consistency Check"
Select "Choose working directory"
Save
(directory has been created in filesystem)



8. REPORT TIMELINE

Reported: 04.12.2015
Vendor response: 05.12.2015
Date of Public Advisory: 13.12.2016

9. REFERENCES
https://erpscan.com/advisories/erpscan-16-041-sap-netweaver-directory-creation-outside-jvm/


10. ABOUT ERPScan Research

ERPScan research team specializes in vulnerability research and
analysis of critical enterprise applications. It was acknowledged
multiple times by the largest software vendors like SAP, Oracle,
Microsoft, IBM, VMware, HP for discovering more than 400
vulnerabilities in their solutions (200 of them just in SAP!).
ERPScan researchers are proud of discovering new types of
vulnerabilities (TOP 10 Web Hacking Techniques 2012) and of the "The
Best Server-Side Bug" nomination at BlackHat 2013.
ERPScan experts participated as speakers, presenters, and trainers at
60+ prime international security conferences in 25+ countries across
the continents ( e.g. BlackHat, RSA, HITB) and conducted private
trainings for several Fortune 2000 companies.
ERPScan researchers carry out the EAS-SEC project that is focused on
enterprise application security awareness by issuing annual SAP
security researches.

EPScan experts were interviewed in specialized info-sec resources and
featured in major media worldwide. Among them, there are Reuters,
Yahoo, SC Magazine, The Register, CIO, PC World, DarkReading, Heise,
Chinabyte, etc.

Our team consists of highly-qualified researchers, specialized in
various fields of cybersecurity (from web application to ICS/SCADA
systems), gathering their experience to conduct the best SAP security
research.


11. ABOUT ERPScan

ERPScan is the most respected and credible Business Application
Cybersecurity provider. Founded in 2010, the company operates globally
and enables large Oil and Gas, Financial, Retail and other
organizations to secure their mission-critical processes. Named as an
‘Emerging Vendor’ in Security by CRN, listed among “TOP 100 SAP
Solution providers” and distinguished by 30+ other awards, ERPScan is
the leading SAP SE partner in discovering and resolving security
vulnerabilities. ERPScan consultants work with SAP SE in Walldorf to
assist in improving the security of their latest solutions.
ERPScan’s primary mission is to close the gap between technical and
business security, and provide solutions for CISO's to evaluate and
secure SAP and Oracle ERP systems and business-critical applications
from both cyberattacks and internal fraud. As a rule, our clients are
large enterprises, Fortune 2000 companies and MSPs, whose requirements
are to actively monitor and manage security of vast SAP and Oracle
landscapes on a global scale.
We ‘follow the sun’ and have two hubs, located in Palo Alto and
Amsterdam, to provide threat intelligence services, continuous support
and to operate local offices and partner network spanning 20+
countries around the globe.

 Adress USA: 228 Hamilton Avenue, Fl. 3, Palo Alto, CA. 94301
Phone: 650.798.5255
Twitter: @erpscan
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