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[ERPSCAN-15-029] Oracle E-Business Suite – XXE injection vulnerability

Application: E-Business Suite
Vendor URL: Oracle
Bugs: XXE injection
Reported: 17.07.2015
Vendor response: 24.07.2015
Date of Public Advisory:20.10.2015
Reference: Oracle CPU Oct 2015
Authors: Nikita Kelesis, Ivan Chalykin, Alexey Tyurin (ERPScan)

VULNERABILITY INFORMATION
Class: XML External Entity [CWE-611]
Impact: information disclosure, DoS, SSRF, NTLM relay
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2015-4849
CVSS Information
CVSS Base Score: 6.8 / 10
CVSS Base Vector:

AV : Access Vector (Related exploit range) Network (N)
AC : Access Complexity (Required attack complexity) Medium (M)
Au : Authentication (Level of authentication needed to exploit) None (N)
C : Impact to Confidentiality Partial (P)
I : Impact to Integrity Partial (P)
A : Impact to Availability Partial (P)

Business Risk
The attacker can read an arbitrary file on the server by sending a correct XML request with a crafted DTD to read the reply from the service.
The attacker can perform a DoS attack (for example, an XML Entity Expansion attack).
An SMB Relay attack is a type of Man-in-the-Middle attack where the attacker asks the victim to authenticate into a machine controlled by the attacker, then relays the credentials to the target. The attacker forwards the authentication information both ways and gets access.

Description
Oracle XML parser validates all incoming XML requests with a user-specified DTD.

VULNERABLE PACKAGES
Oracle E-Business Suite 12.1.3
Other versions are probably affected too, but they were not checked.

SOLUTIONS AND WORKAROUNDS
Install Oracle CPU October 2015

TECHNICAL DESCRIPTION
Vulnerable servlet:
/OA_HTML/IspPunchInServlet