Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Apache VCL. Users can modify form data submitted when requesting a new Block Allocation such that a SELECT SQL statement is modified. The data returned by the SELECT statement is not viewable by the attacker. This issue affects all versions of Apache VCL from 2.2 through 2.5.1. Users are recommended to upgrade to version 2.5.2, which fixes the issue.
The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.