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Vulnerability of Windows: buffer overflow of CNT files

Synthesis of the vulnerability 

When Microsoft Visual Studio or Microsoft Help Workshop is installed, opening a CNT file can lead to code execution.
Vulnerable products: Windows (platform) ~ not comprehensive.
Severity of this weakness: 1/4.
Creation date: 18/01/2007.
Références of this bulletin: BID-22100, VIGILANCE-VUL-6480.

Description of the vulnerability 

The HLP help files are generated by Microsoft Help Workshop (Visual Studio) from CNT files. A CNT file for example contains:
  :Base
  :Title hello
  1 message
  2 message=mapid

When Help Workshop reads a CNT file, messages are stored in a 512 bytes array without checking size. An overflow can thus occur.

An attacker can therefore create a malicious CNT file and invite victim to open it, to execute code on his computer.
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This cybersecurity note impacts software or systems such as Windows (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this computer weakness announce is low.

The trust level is of type unique source, with an origin of document.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this cybersecurity vulnerability.

Solutions for this threat 

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