A1: 2017 - Injection

• OWASP Documentation
• Injection Prevention Cheat Sheet OWASP

SQL Injection

• OWASP Documentation

Actions by GeneXus

• Generates parameterized SQL queries

Actions by Developers

• Avoid the use of SQL Command.
  • Security Scanner helps to detect this scenario with case code #103
• Use an External Object  with a Stored Procedure instead of the SQL Command.
• Use DBRet to generate Data View object for adding tables to the model.
• If the use of the SQL Command is unavoidable the use of OWAP ESAPI is recommended to sanitize end user's entries.
• In case of using External Object the developer will need to review the source code manually.
  • Security Scanner helps to detect this scenario with case code #120

XML Injection

• OWASP Documentation

Actions by GeneXus

• When the SDT's ToXML function is used GeneXus codes the entries.
• When the XML is manually readed/writen XMLWriter and XMLReader functions code/decode the entries and values accordingly.

Actions by Developers

• Sanitize user's entries if those are concatenated to an XML and charged using FromXML function.
  • Security Scanner helps to detect this scenario with case code #126
  • The use of System.Security.SecurityElement.Escape from.Net Framework or org.owasp.esapi.Encoder.encodeForXML from ESAPI for Java is adviced.
• If the function WriteRawText of XMLWriter is used the developer must sanitize user's entires.
  • Security Scanner helps to detect this scenario with case code  #128
  • The use of System.Security.SecurityElement.Escape from.Net Framework or org.owasp.esapi.Encoder.encodeForXML from ESAPI for Java is adviced.
  • Use ValidationType property to validate XML format.
    • Security Scanner helps to detect this scenario with case code #113

JSON Injection

• OWASP Documentation

Actions by GeneXus

• When the SDT's ToJSON function is used GeneXus codes the entries.

Actions by Developers

• Sanitize user's entries if those are concatenated to a JSON and charged using FromJSON function.
  • Security Scanner helps to detect this scenario with case code #127.
  • The use of System.Web.Serialization.JavaScriptSerializer.Serialize from .Net Framework or org.owasp.esapi.Encoder.encodeForJavascript from ESAPI for Java is adviced.

LDAP Injection

• OWASP Documentation

Actions by GeneXus

• GeneXus sanitizes the characters utilized on User and Password fields when it gets the attributes from LDAP Data Type.
• The attributes of the GetAttribute function are structured preventing injections and complex queries.

Actions by Developers

• The developer doesn't have to take any actions but the deploy over a secure channel is advised.

OS Injection

• OWASP Documentation

Actions by GeneXus

• GeneXus doesn't take any specific actions.

Actions by Developers

• If the Shell function is used user's entries must be sanitized by using regular expressions, wrapping parameters between ' " ' and/or codifying special characters.
  • Security Scanner helps to detect this scenario with case code #114.
• Configuring minimum privileges for the application server is also recommended.

SMTP Injection

• OWASP Documentation

Actions by GeneXus

• GeneXus implements all Data Types needed to send e-mail messages on the SMTP Data Type.

Actions by Developers

• The developer doesn't have to take any actions but and adequate server hardening and a periodic log review are recommended.

Code Injection

• OWASP Documentation

Actions by GeneXus

• GeneXus validates the inputs for dynamic class loading.

Actions by Developers

• Validate Blob's extensions by whitelisting.
  • Security Scanner helps to detect this scenario with case code #129.
• Use dynamic class loading only if needed and the inputs must be validated before the execution.
  • Security Scanner helps to detect this scenario with case code #108.

Log Injection

• OWASP Documentation

Actions by GeneXus

• GeneXus allows developers to modify the log through an external object. See Log external object. Valid for GeneXus 16 or upper.
• GeneXus allows generating application activity logs that have user input information  see JDBC Log, Log file property, Log level property, Log output property
• Another way to add log information to the application activity logs is using the Msg function. This function also adds information to the stdout log file on Java applications running on Tomcat.

Actions by Developers

• It is recommended to avoid the use of unsanitized user inputs when the Msg function or the Log external object are used.
• The developers must not alter the application flow using log information as input in runtime.
• The developer must configure the log file, size, and backups on the server when it is used and take monitoring actions accordingly.