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ZDI-10-215: IBM Informix Dynamic Server librpc.dll Integer Overflow Remote Code Execution Vulnerability
From: ZDI Disclosures <zdi-disclosures () tippingpoint com>
Date: Mon, 18 Oct 2010 16:16:02 -0500

ZDI-10-215: IBM Informix Dynamic Server librpc.dll Integer Overflow Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-215
October 18, 2010

-- CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

-- Affected Vendors:
IBM

-- Affected Products:
IBM Informix

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 5373.
For further product information on the TippingPoint IPS, visit:

    http://www.tippingpoint.com

-- Vulnerability Details:
This vulnerability allows attackers to execute arbitrary code on
vulnerable installations of IBM Informix Dynamic Server. Authentication
is not required to exploit this vulnerability.

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. A lack of sanity checking on supplied
parameter sizes can result in an integer overflow and subsequent heap
buffer under allocation which can finally lead to an exploitable memory
corruption.

-- Vendor Response:
IBM states:
this issue was fixed in ISM 2.20.TC1.117

Integrated into the following versions by defect#

idsdb00146931 - 7.31.xD11
idsdb00146930 - 9.40.xC10
idsdb00146929 - 10.00.xC8
idsdb00138308 - 11.10.xC2

This was fixed before 11.50 went GA; the fix is also in 11.50.

-- Disclosure Timeline:
2007-05-22 - Vulnerability reported to vendor
2010-10-18 - Coordinated public release of advisory

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

-- About the Zero Day Initiative (ZDI):
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a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
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