SAP NetWeaver AS ABAP 7.4 Directory Traversal

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


                                            `Application: SAP NetWeaver AS ABAP  
Versions Affected: SAP NetWeaver AS ABAP 7.4  
Vendor URL:  
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)  
Title: [ERPSCAN-16-031] SAP NetWeaver AS ABAP a directory traversal  
Advisory ID: [ERPSCAN-16-031]  
Risk: high  
Advisory URL:  
Date published: 11.11.2016  
Vendors contacted: SAP  
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)  
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.  
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  
To correct this vulnerability, install SAP Security Note 2312966  
Daria Prosochkina (ERPScan)  
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 .  
433. p_flen = p_flen + XSTRLEN( lw-d ) .  
434. ENDDO.  
Sent: 22.04.2016  
Reported: 23.04.2016  
Vendor response: 23.04.2016  
Date of Public Advisory: 09.08.2016  
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