TippingPoint Zero Day Initiative

IBM Informix Dynamic Server librpc.dll Integer Overflow Remote Code Execution Vulnerability

ZDI-10-215: October 18th, 2010

CVSS Score

Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5373. For further product information on the TippingPoint IPS:

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


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