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Vulnerability of IBM Informix Dynamic Server: privilege elevation via COLLATION

Synthesis of the vulnerability 

A local attacker can use the SET COLLATION command of IBM Informix Dynamic Server, in order to generate a buffer overflow, and to execute code with privileges of the service.
Vulnerable products: Informix Server.
Severity of this weakness: 2/4.
Creation date: 25/09/2012.
Références of this bulletin: BID-55668, CERTA-2012-AVI-525, CVE-2012-3334, DCA-2011-0013, swg21611800, VIGILANCE-VUL-11976.

Description of the vulnerability 

The "SET COLLATION" SQL command is used to define the sorting order of characters (most of the times, it depends on the locale). For example :
  SET COLLATION en_us.8859-1

However, if the parameter is too long, an overflow occurs.

A local attacker can therefore use the SET COLLATION command of IBM Informix Dynamic Server, in order to generate a buffer overflow, and to execute code with privileges of the service.
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This computer vulnerability impacts software or systems such as Informix Server.

Our Vigil@nce team determined that the severity of this weakness bulletin is medium.

The trust level is of type confirmed by the editor, with an origin of user account.

An attacker with a expert ability can exploit this weakness.

Solutions for this threat 

IBM Informix Dynamic Server: version 11.70.xC5.
The version 11.70.xC5 is corrected:
  http://www-01.ibm.com/support/

IBM Informix Dynamic Server: version 11.50.xC9W2.
The version 11.50.xC9W2 is corrected:
  http://www-01.ibm.com/support/
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