SAP NetWeaver AS ABAP 7.4 path traversal

Summaryinfo

A vulnerability classified as problematic was found in SAP NetWeaver AS ABAP 7.4. The impacted element is an unknown function. Such manipulation leads to path traversal. There is not any exploit available.

Detailsinfo

A vulnerability was found in SAP NetWeaver AS ABAP 7.4 (Solution Stack Software). It has been rated as problematic. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality.

The weakness was released 11/18/2016 by Daria Prosochkina as [ERPSCAN-16-031] SAP NetWeaver AS ABAP – directory traversal using READ DATASET / 2312966 as confirmed mailinglist post (Bugtraq). The advisory is shared for download at seclists.org. The public release was coordinated with the vendor. The exploitation is known to be easy. The attack may be launched remotely. The successful exploitation requires a simple authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/05/2019). The MITRE ATT&CK project declares the attack technique as T1006. The following code is the reason for this vulnerability:

p_flen = 0.
DO.
   READ DATASET p_ifilea INTO lw.
   Exit conditions for accessing in a loop
   IF sy-subrc NE 0. EXIT. ENDIF.
   APPEND lw TO p_itab .

   p_flen = p_flen + XSTRLEN( lw-d ) .
ENDDO.

he 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 vulnerability was handled as a non-public zero-day exploit for at least 209 days. During that time the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Solution Stack Software

Vendor

• SAP

Name

• NetWeaver AS ABAP

Version

• 7.4

License

• commercial

Website

• Vendor: https://www.sap.com/

CPE 2.3info

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CPE 2.2info

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