Smarty up to 3.1.33-dev-3 Protection Mechanism path traversal

Summaryinfo

A vulnerability was found in Smarty up to 3.1.33-dev-3 and classified as critical. Affected by this vulnerability is an unknown functionality of the component Protection Mechanism. Executing a manipulation with the input file:./../ can lead to path traversal. The identification of this vulnerability is CVE-2018-16831. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Smarty up to 3.1.33-dev-3 (Customer Relationship Management System). This vulnerability affects an unknown code of the component Protection Mechanism. The manipulation with the input value file:./../ 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. CVE summarizes:

Smarty before 3.1.33-dev-4 allows attackers to bypass the trusted_dir protection mechanism via a file:./../ substring in an include statement.

The bug was discovered 09/05/2018. The weakness was shared 09/11/2018 (Website). The advisory is shared for download at github.com. This vulnerability was named CVE-2018-16831 since 09/11/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

The vulnerability was handled as a non-public zero-day exploit for at least 6 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-dev-4 eliminates this vulnerability.

The entries VDB-111284 and VDB-124207 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Customer Relationship Management System

Name

• Smarty

Version

• 3.1.33-dev-3

License

• commercial

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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