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[ERPSCAN-16-021] SAP xMII – Reflected XSS vulnerability

Application: SAP NetWeaver AS JAV
Versions Affected: SAP NetWeaver AS JAVA 7.4
Vendor URL: SAP
Bugs: XSS
Reported: 05.05.2015
Vendor response: 06.05.2015
Date of Public Advisory: 12.04.2016
Reference: SAP Security Note 2201295
Author: Nursultan Abubakirov , Vahagn Vardanyan (ERPScan)

VULNERABILITY INFORMATION

Class: Cross-site scripting
Impact: steal user's cookies, modify web page contents
Remotely Exploitable: Yes
Locally Exploitable: No
CVE: CVE-2016-4016

CVSS Information

CVSS Base Score v3: 6.1 / 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) None (N)
UI : User Interaction (Required user participation) Required (R)
S : Scope (Change in scope due to impact caused to components beyond the vulnerable component) Changed (C)
C : Impact to Confidentiality Low (L)
I : Impact to Integrity Low (L)
A : Impact to Availability None (N)

Description
Anonymous attacker can use a special HTTP request to hijack session data of administrators or users of a web resource.

Business risk
An attacker can use a Cross-site scripting vulnerability to inject a malicious script into a page.
Reflected XSS feature is the necessity of tricking a user from an attackers' side - they must make user follow a specially crafted link. Speaking about stored XSS, the malicious script is injected and permanently stored in a page body, thus a victim is attacked without performing any actions.
The malicious script can access all cookies, session tokens, and other critical information stored by a browser and used for interaction with the site. The attacker can gain access to user session and learn business-critical information, in some cases it is possible to get control over this information. Also, XSS can be used for unauthorized modifying of displayed site content.

VULNERABLE PACKAGES

SAP NetWeaver AS JAVA xMII 7.4
Other versions are probably affected too, but they were not checked.

SOLUTIONS AND WORKAROUNDS

To correct this vulnerability, install SA Security2201295

TECHNICAL DESCRIPTION

Proof of Concept