Smarty up to 3.1.32 isTrustedResourceDir path traversal

Summaryinfo

A vulnerability classified as critical has been found in Smarty up to 3.1.32. The affected element is the function Smarty_Security::isTrustedResourceDir. This manipulation causes path traversal. This vulnerability is tracked as CVE-2018-13982. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Smarty up to 3.1.32 (Customer Relationship Management System). It has been declared as critical. Affected by this vulnerability is the function Smarty_Security::isTrustedResourceDir. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Smarty_Security::isTrustedResourceDir() in Smarty before 3.1.33 is prone to a path traversal vulnerability due to insufficient template code sanitization. This allows attackers controlling the executed template code to bypass the trusted directory security restriction and read arbitrary files.

The bug was discovered 09/17/2018. The weakness was disclosed 09/18/2018 (GitHub Repository). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-13982 since 07/11/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277715 (Fedora Security Update for php-Smarty (FEDORA-2019-d248c5aa39)).

Upgrading to version 3.1.33 eliminates this vulnerability.

The entries VDB-111284 and VDB-123904 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Customer Relationship Management System

Name

• Smarty

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.1.14
• 3.1.15
• 3.1.16
• 3.1.17
• 3.1.18
• 3.1.19
• 3.1.20
• 3.1.21
• 3.1.22
• 3.1.23
• 3.1.24
• 3.1.25
• 3.1.26
• 3.1.27
• 3.1.28
• 3.1.29
• 3.1.30
• 3.1.31
• 3.1.32

License

• commercial

CPE 2.3info

• 🔍
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CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

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