Contao up to 3.5.27/4.4.0 URL input validation

Summaryinfo

A vulnerability was found in Contao up to 3.5.27/4.4.0. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component URL Handler. This manipulation causes input validation. This vulnerability is registered as CVE-2017-10993. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Contao up to 3.5.27/4.4.0. It has been declared as critical. Affected by this vulnerability is an unknown function of the component URL Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

Contao before 3.5.28 and 4.x before 4.4.1 allows remote attackers to include and execute arbitrary local PHP files via a crafted parameter in a URL, aka Directory Traversal.

The bug was discovered 07/12/2017. The weakness was published 07/21/2017 (Website). It is possible to read the advisory at contao.org. This vulnerability is known as CVE-2017-10993 since 07/07/2017. The exploitation appears to be easy. The attack can be launched remotely. The successful exploitation requires a single authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.5.28 or 4.4.1 eliminates this vulnerability.

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Productinfo

Name

• Contao

Version

• 3.5.0
• 3.5.1
• 3.5.2
• 3.5.3
• 3.5.4
• 3.5.5
• 3.5.6
• 3.5.7
• 3.5.8
• 3.5.9
• 3.5.10
• 3.5.11
• 3.5.12
• 3.5.13
• 3.5.14
• 3.5.15
• 3.5.16
• 3.5.17
• 3.5.18
• 3.5.19
• 3.5.20
• 3.5.21
• 3.5.22
• 3.5.23
• 3.5.24
• 3.5.25
• 3.5.26
• 3.5.27
• 4.0
• 4.1
• 4.2
• 4.3
• 4.4.0

CPE 2.3info

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CPE 2.2info

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