NGSSoftware Insight Security Research Advisory
Name: Arbitrary Library Loading in Informix
Systems Affected: All versions of Informix
Vendor URL: http://www.ibm.com/
Author: David Litchfield [ email@example.com ]
Date of Public Advisory: 2nd August 2006
Advisory number: #NISR02082006C
Advisory URL: http://www.ngssoftware.com/research/
Informix Dynamic Server is a database developed by IBM. An attacker can
force to the database server to load an arbitrary library and thus execute
The ifx_load_internal SQL function can be used to load an arbitrary library
into the address space of the database server process. By placing code in
the DllMain() function on Windows or _init() on Linux an attacker can have
this code execute automatically when the library is loaded. In conjunction
with exploiting other flaws it is possible to remotely create a library over
SQL, dump this to the server disk and then load it.
IBM was alerted to this flaw on the 18th January 2005. Revoking execute
permission on ifx_load_internal SQL function from public will remove the
risk of exploitation of this issue.
NGSSQuirreL for Informix, an advanced vulnerability assessment scanner
designed specifically for Informix, can be used to accurately determine
whether your servers are vulnerable to this flaw. More information about
NGSSQuirreL for Informix can be found here
NGSSoftware develops vulnerability assessment and compliancy tools for
database servers including Oracle, Microsoft SQL Server, DB2, Sybase and
Informix. Headquartered in the United Kingdom NGS has offices in London, St.
Andrews (UK), Sydney, Brisbane, and Perth (Australia) and Texas in the
United States; NGSConsulting provide services to some of the largest and
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