ZDI-10-023: Multiple Vendor librpc.dll Signedness Error Remote Code- Execution Vulnerability

From: ZDI Disclosures <zdi-disclosures@tippingpoint.com>
To: 'full-disclosure@lists.grok.org.uk' <full-disclosure@lists.grok.org.uk>,'bugtraq@securityfocus.com' <bugtraq@securityfocus.com>
Subject: ZDI-10-023: Multiple Vendor librpc.dll Signedness Error Remote Code- Execution Vulnerability

ZDI-10-023: Multiple Vendor librpc.dll Signedness Error Remote Code Execution Vulnerability
March 1, 2010

-- CVE ID:

-- Affected Vendors:

-- Affected Products:
IBM Informix
EMC NetWorker

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5945. 
For further product information on the TippingPoint IPS, visit:


-- Vulnerability Details:
This vulnerability allows attackers to execute arbitrary code on
vulnerable installations of both IBM Informix Dynamic Server and EMC
Legato Networker. User interaction is not required to exploit this

The specific flaw exists within the RPC protocol parsing library,
librpc.dll, utilized by the ISM Portmapper service (portmap.exe) bound
by default to TCP port 36890. During authentication, a lack of a proper
signedness check on a supplied parameter size can result in exploitable
stack based buffer overflow leading to arbitrary code execution under
the context of the SYSTEM user.

-- Vendor Responses:
IBM states:
This issue was first fixed in: IDS 10.00.TC9, IDS
11.10.TC3 Recommended fix pack version: IDS 10.00.TC10, IDS 11.10.TC3 4.
URL to APAR or fixpack Fix pack download URL:
 http://www.ibm.com/support/docview.wss?uid=swg1IC55330EMC states:

EMC states:
EMC has released a Security Advisory (ESA-08-007) identifier to
customers through Powerlink.

-- Disclosure Timeline:
2008-02-07 - Vulnerability reported to vendor
2010-03-01 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Sebastian Apelt (sebastian.apelt@siberas.de)

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