CVE-2017-10993 : Security Advisory and Response

Contao versions prior to 3.5.28 and 4.x before 4.4.1 are vulnerable to a Directory Traversal exploit that allows remote attackers to execute local PHP files by manipulating a URL parameter.

Understanding CVE-2017-10993

This CVE identifies a security vulnerability in Contao versions that can be exploited by attackers to include and execute local PHP files.

What is CVE-2017-10993?

Contao versions before 3.5.28 and 4.x before 4.4.1 are susceptible to a Directory Traversal attack, enabling malicious actors to manipulate a URL parameter to execute arbitrary PHP files.

The Impact of CVE-2017-10993

This vulnerability poses a significant risk as it allows remote attackers to execute unauthorized PHP code on the server, potentially leading to data breaches, system compromise, and unauthorized access.

Technical Details of CVE-2017-10993

Contao's vulnerability to remote file inclusion and execution has the following technical aspects:

Vulnerability Description

The flaw in Contao versions prior to 3.5.28 and 4.x before 4.4.1 permits remote attackers to include and execute local PHP files by tampering with a URL parameter, facilitating a Directory Traversal attack.

Affected Systems and Versions

Contao versions before 3.5.28
Contao 4.x versions before 4.4.1

Exploitation Mechanism

Attackers exploit this vulnerability by manipulating a specific parameter in a URL to trick the application into executing arbitrary PHP files.

Mitigation and Prevention

To address CVE-2017-10993 and enhance system security, consider the following measures:

Immediate Steps to Take

Update Contao to version 3.5.28 or 4.4.1 to mitigate the vulnerability.
Implement input validation to sanitize user-supplied data and prevent malicious input.
Monitor and analyze web server logs for any suspicious activity indicating a possible exploit attempt.

Long-Term Security Practices

Regularly audit and review the application's codebase for security vulnerabilities.
Educate developers and administrators on secure coding practices and the risks associated with unvalidated user input.

Patching and Updates

Stay informed about security updates and patches released by Contao to address known vulnerabilities.