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computer vulnerability alert CVE-2012-3334

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.
Consequences of an attack: privileged access/rights.
Hacker's origin: user account.
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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