TippingPoint Zero Day Initiative

Multiple Vendor librpc.dll Signedness Error Remote Code Execution Vulnerability

ZDI-10-023: March 1st, 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 5945. For further product information on the TippingPoint IPS:

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 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. 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 Response

IBM states:

IBM states that 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-933.ibm.com/support/fixcentral/

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


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