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Vulnerability of WordPress NextGEN Gallery: directory traversal

Synthesis of the vulnerability 

An attacker can traverse directories of WordPress NextGEN Gallery, in order to read a file outside the service root path.
Impacted products: WordPress Plugins ~ not comprehensive.
Severity of this bulletin: 2/4.
Creation date: 16/11/2016.
Références of this threat: CVE-2016-6565, VIGILANCE-VUL-21141, VU#346175.

Description of the vulnerability 

The NextGEN Gallery plugin can be installed on WordPress.

However, user's data are directly inserted in an access path. Sequences such as "/.." can thus be used to go in the upper directory.

An attacker can therefore traverse directories of WordPress NextGEN Gallery, in order to read a file outside the service root path.
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This security weakness impacts software or systems such as WordPress Plugins ~ not comprehensive.

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

The trust level is of type confirmed by the editor, with an origin of internet client.

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 threat.

Solutions for this threat 

WordPress NextGEN Gallery: version 2.1.57.
The version 2.1.57 is fixed:
  https://wordpress.org/plugins/nextgen-gallery/
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