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[ERPSCAN-16-034] SAP NetWeaver AS JAVA – XXE vulnerability in BC-BMT-BPM-DSK component (CVE-2016-9563)

Application: SAP NetWeaver AS JAVA
Versions Affected: SAP NetWeaver AS JAVA 7.5
Vendor URL: SAP
Bugs: XXE
Reported: 09.03.2016
Vendor response: 10.03.2016
Date of Public Advisory: 09.08.2016
Reference: SAP Security Note 2296909
Author: Vahagn Vardanyan (ERPScan)

VULNERABILITY INFORMATION

Class: XXE
Impact: Denial of Service, Read File
Remotely Exploitable: Yes
Locally Exploitable: No

CVSS Information

CVSS Base Score v3: 6.4 / 10
CVSS Base Vector:

AV: Attack Vector (Related exploit range) Network (N)
AC: Attack Complexity (Required attack complexity) High (H)
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) Unhanged (U)
C: Impact to Confidentiality Low (L)
I: Impact to Integrity Low (L)
A: Impact to Availability High (H)

Description

1) It allows an attacker to perform a DoS attack (for example, an XML Entity expansion attack)
2) An SMB Relay attack is a type of man-in-the-middle attack when an attacker asks a victim to authenticate into a machine controlled by the attacker, then relays the credentials to the target. The attackers forward the authentication information both ways, that provides them with access.

Business risk

An attacker can use an XML external entity vulnerability to send specially crafted unauthorized XML requests which will be processed by XML parser. An attacker can use an XML external entity vulnerability to obtain unauthorized access to an OS filesystem.

VULNERABLE PACKAGES

BPEM PORTAL CONTENT 7.20
BPEM PORTAL CONTENT 7.30
BPEM PORTAL CONTENT 7.31
BPEM PORTAL CONTENT 7.40
BPEM PORTAL CONTENT 7.50

SOLUTIONS AND WORKAROUNDS

To correct this vulnerability, install SAP Security Note 2296909.

TECHNICAL DESCRIPTION