Reflection injection

Revision as of 09:34, 29 May 2009 by Deleted user (Talk | contribs)

Jump to: navigation, search

[ auto cad 6 cracks ] http asian cac cua nuoc thu trong domain asia house insurance ppm [ prestige auto finance ] [ how to uninstall norton antivirus 2003 ] [ jetstar australia flights ] [ australia holiday packages ] [ asian herbal ] page [ african chiclids species ] [ defender pro plus antivirus ] http [ south africa cellular ] [ asians and hispanics ] [ asianspirit philippines ] [ brisbane in australia ] [ capitals of africa countries ] [ african american make tip up woman ] index [ pop pro up winantivirus ] antivirus personal free [ outdoor asian cooking ] [ antivirus software for windows 2000 ] [ south africa apartments for sale ] [ automobile rubber floor mat ] [ introduced animals to australia ] [ african animal figure wood ] top [ household auto finance co ] [ asian women tied up ] [ golden retriever breeders australia ] [ snyders antique auto parts ] [ authentication auto ] [ official site of australian open ] [ meaning of african names ] [ nkosi sikelel iafrica mp3 ] [ asian skin xanga ] [ african tribal music instruments ] [ just lettings south africa ] [ history of african american spiritual ] [ auto part saab used ] [ hanks asian movies ] domain [ south africa sports channel ] [ antivirus software for windows 2000 ] [ symantec antivirus communications layer failed to initialize ] [ pt cruisers australia ] [ auto arrange desktop icons ] This is a Vulnerability. To view all vulnerabilities, please see the Vulnerability Category page.

Last revision (mm/dd/yy): 05/29/2009

Vulnerabilities Table of Contents


Reflection injection problems are a subset of injection problems, in which external input is used to construct a string value passed to class reflection APIs. By manipulating the value an attacker can cause unexpected classes to be loaded, or change what method or fields are accessed on an object.


  • Access control: Reflection injection allows for the execution of arbitrary code by the attacker.

Exposure period

  • Design: It may be possible to find alternate methods for satisfying functional requirements than using reflection.
  • Implementation: Avoid using external input to generate reflection string values.


  • Language: Java, .NET, and other languages that support reflection
  • Platform: Any

Required resources




Likelihood of exploit


The most straightforward reflection injection attack is to provide the name of an alternate class available to the target application which implements the same interfaces but operates in a less secure manner. This can be used as leverage for more extensive attacks. More complex attacks depend upon the specific deployment situation of the application.

If the classloader being used is capable of remote class fetching this becomes an extremely serious vulnerability, since attackers could supply arbitrary URLs that point at constructed attack classes. In this case, the class doesn't necessarily even need to implement methods that perform the same as the replaced class, since a static initializer could be used to carry out the attack.

If it is necessary to allow reflection utilizing external input, limit the possible values to a predefined list. For example, reflection is commonly used for loading JDBC database connector classes. Most often, the string class name is read from a configuration file. Injection problems can be avoided by embedding a list of strings naming each of the supported database driver classes and requiring the class name read from the file to be in the list before loading.

Risk Factors

  • Talk about the factors that make this vulnerability likely or unlikely to actually happen
  • Discuss the technical impact of a successful exploit of this vulnerability
  • Consider the likely [business impacts] of a successful attack


The following Java code dynamically loads a connection class to be used for transferring data:

// connType is a String read from an external source
Class connClass = Class.forName(connType);
HttpURLConnection conn = (HttpURLConnection)connClass.newInstance();

Suppose this application normally passed "". This would provide an HTTPS connection using SSL to protect the transferred data. If an attacker replaced the connType string with "" then all data transfers performed by this code would happen over an un-encrypted HTTP connection instead.

Related Attacks

Related Vulnerabilities

Related Controls

  • Design: It may be possible to find alternate methods for satisfying functional requirements than using reflection.
  • Implementation: Avoid using external input to generate reflection string values.

Related Technical Impacts