SAP NetWeaver AS ABAP 7.4 Directory Traversal

2016-11-19T00:00:00
ID PACKETSTORM:139807
Type packetstorm
Reporter Daria Prosochkina
Modified 2016-11-19T00:00:00

Description

                                        
                                            `Application: SAP NetWeaver AS ABAP  
  
Versions Affected: SAP NetWeaver AS ABAP 7.4  
  
Vendor URL: http://SAP.com  
  
Bugs: Directory traversal  
  
Sent: 22.04.2016  
  
Reported: 23.04.2016  
  
Vendor response: 23.04.2016  
  
Date of Public Advisory: 09.08.2016  
  
Reference: SAP Security Note 2312966  
  
Author: Daria Prosochkina (ERPScan)  
  
  
  
Description  
  
  
  
1. ADVISORY INFORMATION  
  
Title: [ERPSCAN-16-031] SAP NetWeaver AS ABAP a directory traversal  
using READ DATASET  
  
Advisory ID: [ERPSCAN-16-031]  
  
Risk: high  
  
Advisory URL: https://erpscan.com/advisories/erpscan-16-031-sap-netweaver-abap-directory-traversal-via-using-read-dataset/  
  
Date published: 11.11.2016  
  
Vendors contacted: SAP  
  
  
2. VULNERABILITY INFORMATION  
  
Class: Directory traversal  
  
Impact: read file from system  
  
Remotely Exploitable: yes  
  
Locally Exploitable: yes  
  
  
CVSS Information  
  
CVSS Base Score v3: 4.3 / 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) Low (L)  
  
UI : User Interaction (Required user participation) None (N)  
  
S : Scope (Change in scope due to impact caused to components beyond  
the vulnerable component) Unchanged (U)  
  
C : Impact to Confidentiality Low (L)  
  
I : Impact to Integrity None (N)  
  
A : Impact to Availability None (N)  
  
  
  
3. VULNERABILITY DESCRIPTION  
  
The code provides access to the file specified after the READ DATASET  
statement. The variable transmitted to the input of the statement is  
entered in it by user input. Thus, the user can access the files  
stored on the operating system. This vulnerability is called a  
Directory Traversal.  
  
The attack is possible if the application does not check the user data  
and does not delete special characters used for a directory traversal  
attack from the variable, in which the filename is passed. As a  
result, an attacker can read data from all files, to which the  
application has access.  
  
To discover this vulnerability, data flow analysis and other unique  
techniques are used.  
  
  
4. VULNERABLE PACKAGES  
  
SAP_ABA 700  
  
SAP_ABA 701  
  
SAP_ABA 702  
  
SAP_ABA 710  
  
SAP_ABA 711  
  
SAP_ABA 730  
  
SAP_ABA 731  
  
SAP_ABA 740  
  
SAP_ABA 750  
  
SAP_ABA 751  
  
SAP_ABA 75A  
  
SAP_ABA 75B  
  
  
5. SOLUTIONS AND WORKAROUNDS  
  
To correct this vulnerability, install SAP Security Note 2312966  
  
  
  
6. AUTHOR  
  
Daria Prosochkina (ERPScan)  
  
  
7. TECHNICAL DESCRIPTION  
  
Attacker can read any file from OS with use BUPA_BIP_FILE_IMPORT program.  
  
Filename used in statement READ DATASET (line 428) is entered in this  
statement by user input. User can pass to input arbitrary filepath,  
for example /etc/passwd. As a result of execution of the  
BUPA_BIP_FILE_IMPORT program, data from /etc/passwd will be written in  
P_FLEN variable in hex format.  
  
  
Vulnerable code  
  
  
426. p_flen = 0.  
  
427. DO.  
  
428. READ DATASET p_ifilea INTO lw.  
  
429.* Exit conditions for accessing in a loop  
  
430. IF sy-subrc NE 0. EXIT. ENDIF.  
  
431. APPEND lw TO p_itab .  
  
432.  
  
433. p_flen = p_flen + XSTRLEN( lw-d ) .  
  
434. ENDDO.  
  
  
  
8. REPORT TIMELINE  
  
Sent: 22.04.2016  
  
Reported: 23.04.2016  
  
Vendor response: 23.04.2016  
  
Date of Public Advisory: 09.08.2016  
  
  
  
9. REFERENCES  
  
https://erpscan.com/advisories/erpscan-16-031-sap-netweaver-abap-directory-traversal-via-using-read-dataset/  
  
  
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.  
  
ERPScan 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  
aEmerging Vendora in Security by CRN, listed among aTOP 100 SAP  
Solution providersa 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.  
  
ERPScanas 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 afollow the suna 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  
`