CVE-2015-7695: Zend Framework SQL Injection in PDO Adapter

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Background

Zend Framework is a popular open-source PHP framework that provides a collection of professional PHP packages. It offers a robust and scalable platform for developing web applications. The vulnerability in question affects the PDO adapters in Zend Framework versions prior to 1.12.16. PDO adapters are responsible for connecting to databases and executing SQL statements. This vulnerability allows remote attackers to execute arbitrary SQL commands by exploiting a SQL injection vector that utilizes null bytes in PDO queries.

Vulnerability Detail

The vulnerability arises from the lack of null byte filtering in SQL statements within the PDO adapters of Zend Framework. This oversight enables attackers to inject malicious SQL commands into crafted queries. By exploiting this vulnerability, remote attackers can execute arbitrary SQL commands, potentially leading to unauthorized access, data manipulation, or even complete compromise of the affected system.

composer require zendframework/zendframework1:1.12.16

Workaround

As a temporary workaround, developers can manually filter null bytes in SQL statements before executing them. This can be achieved by using appropriate sanitization techniques or by implementing prepared statements with parameter binding. Here is an example of using prepared statements with parameter binding in PHP:

$pdo = new PDO($dsn, $username, $password);
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $username);
$stmt->execute();
$result = $stmt->fetchAll();

Conclusion

The vulnerability in the PDO adapters of Zend Framework versions prior to 1.12.16 allows remote attackers to execute arbitrary SQL commands. To mitigate this vulnerability, it is recommended to upgrade to Zend Framework version 1.12.16 or later. Developers can also implement temporary workarounds such as manually filtering null bytes or using prepared statements with parameter binding. For further assistance with vulnerability remediation, please contact DevNack.com.

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