SAP PCo agent - DoS vulnerability

2015-05-09T00:00:00
ID ERPSCAN-15-032
Type erpscan
Reporter ERPScan
Modified 2015-05-09T00:00:00

Description

Application: SAP PCo Vendor: <http://www.sap.com> Bugs: DoS Reported: 05.09.2015 Vendor response: 06.09.2015 Date of Public Advisory: 20.11.2015 Reference: SAP Security Note 2238619 Author: Mathieu GELI (ERPScan)

VULNERABILITY INFORMATION

Class: Denial of service
Impact: Disrupt operational status
Remotely Exploitable: Yes
Locally Exploitable: Yes
CVE Name: CVE-2015-8330
CVSS Information
CVSS Base Score: 7.1 / 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 | None (N)
I: Impact to Integrity | None (N)
A: Impact to Availability | Complete (C)

Business risk

It is possible to use denial of service to terminate the process of the vulnerable component. As a result, nobody can use this service, which has a negative influence on business processes. System downtime also harms business reputation.

Description

An attacker can crash the PCo agent by forging xMII requests to the TCP port.

VULNERABLE PACKAGES

SAP PCo agent 2.2, 2.3, 15.0 and 15.1
Other versions are probably affected too, but they were not checked.

SOLUTIONS AND WORKAROUNDS

To correct this vulnerability, install SAP Security Note 2238619

TECHNICAL DESCRIPTION

When sending special forged queries to the SAP Pco Agent (available in query mode), you can crash the agent and disrupt a PCo operation.

Proof of concept

Send to port 9000 (or to which is configured as the query port in the PCo Agent configuration) the following:

<?xml version="1.0" encoding="UTF-8"?>pco:tag<![CDATA[CALL 'AAA[...60000...]AAA';]]/pco:tag/pco:request

1

|

<?xml version="1.0" encoding="UTF-8"?>pco:tag<![CDATA[CALL 'AAA[...60000...]AAA';]]/pco:tag/pco:request

---|---

Defense

To prevent this issue as well as a plethora of other vulnerabilities that may affect your systems, ERPScan provides the following services: