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Vulnerability of Smarty: directory traversal via Smarty_Security-isTrustedResourceDir

Synthesis of the vulnerability 

An attacker can traverse directories via Smarty_Security::isTrustedResourceDir() of Smarty, in order to read a file outside the service root path.
Vulnerable products: Debian, Fedora.
Severity of this weakness: 2/4.
Creation date: 06/03/2019.
Références of this bulletin: CVE-2018-13982, DLA-2618-1, DLA-2618-2, FEDORA-2019-d248c5aa39, FEDORA-2019-e595e8a7d7, VIGILANCE-VUL-28668.

Description of the vulnerability 

An attacker can traverse directories via Smarty_Security::isTrustedResourceDir() of Smarty, in order to read a file outside the service root path.
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This threat bulletin impacts software or systems such as Debian, Fedora.

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

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

An attacker with a expert ability can exploit this computer threat.

Solutions for this threat 

Debian 9: new smarty3 packages.
New packages are available:
  Debian 9: smarty3 3.1.31+20161214.1.c7d42e4+selfpack1-2+deb9u3

Fedora: new php-Smarty packages.
New packages are available:
  Fedora 28: php-Smarty 3.1.33-1.fc28
  Fedora 29: php-Smarty 3.1.33-1.fc29
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