full-disclosure - ZDI-10-151: SAP Crystal Reports 2008 GIOP Message Size Integer Overflow Remote Code Execution Vulnerability

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Date: Wed, 11 Aug 2010 11:00:39 -0500
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Subject: ZDI-10-151: SAP Crystal Reports 2008 GIOP Message
 Size Integer Overflow Remote Code Execution Vulnerability

ZDI-10-151: SAP Crystal Reports 2008 GIOP Message Size Integer Overflow Remote Code Execution Vulnerability
http://dvlabs.tippingpoint.com/advisory/ZDI-10-151
August 11, 2010

-- Affected Vendors:
SAP

-- Affected Products:
SAP Crystal Reports

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9846. 
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of SAP Crystal Reports. Authentication is not
required to exploit this vulnerability.

The specific flaw exists within the ebus-3-3-2-6.dll module responsible
for parsing GIOP requests for multiple processes. While parsing the
first packet the function OBGIOPServerWorker::extractHeader trusts the
provided size of the next packet and attempts to re-allocate a buffer.
By providing a large enough value an integer overflow can occur and the
buffer can become undersized. A later memory copy using the original
value specified in the packet can copy controlled data to the heap
buffer. The affected services spawn multiple threads frequently enough
that an attacker can theoretically win a race condition by sending
multiple requests thus forcing the process to access the corrupted
memory while the overflow is occurring. Successful exploitation would
lead to remote code execution in the context of the SYSTEM user.

-- Vendor Response:
SAP has issued an update to correct this vulnerability. More
details can be found at:

https://service.sap.com/sap/support/notes/1473327

-- Disclosure Timeline:
2010-05-03 - Vulnerability reported to vendor
2010-08-11 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Aaron Portnoy, TippingPoint DVLabs
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